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Is the observable Universe consistent with the cosmological principle?

CLASSICAL AND QUANTUM GRAVITY (2023)

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Hirokazu Fujii

Summary: In this study, we reexamine the large-scale homogeneity in the spatial distribution of quasars and find that on average, their distribution reaches homogeneity at a certain scale, providing constraints on the spatial extent of the HCBGW.

SERBIAN ASTRONOMICAL JOURNAL (2022)

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Article Astronomy & Astrophysics

Hints of FLRW breakdown from supernovae

Chethan Krishnan et al.

Summary: This study explores the correlation between higher H-0 and the CMB dipole direction based on the angular distribution of type Ia supernovae in the Pantheon compilation. It suggests the possibility of probing anisotropic Hubble expansions and provides concrete predictions for future inferences of H-0.

PHYSICAL REVIEW D (2022)

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Article Astronomy & Astrophysics

On the Evolution of the Hubble Constant with the SNe Ia Pantheon Sample and Baryon Acoustic Oscillations: A Feasibility Study for GRB-Cosmology in 2030

Maria Giovanna Dainotti et al.

Summary: This paper discusses the evolution of the Hubble constant and presents conclusions based on the analysis of supernovae and acoustic oscillation data. The study finds a decreasing trend with eta in the sample, which may be related to astrophysical biases or modified gravity theories. This research is important for understanding the evolution of the Hubble constant.

GALAXIES (2022)

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Article Astronomy & Astrophysics

Dark Energy Survey Year 3 results: Cosmology from cosmic shear and robustness to data calibration

A. Amon et al.

Summary: This work presents the Dark Energy Survey Year 3 cosmic-shear measurements and cosmological constraints based on an analysis of over 100 million source galaxies, while a companion paper provides further details. The measurements are consistent with the Λ CDM model and yield precise results for the clustering amplitude and S-8. The low-redshift measurements agree with the Planck Cosmic Microwave Background result, but the high-redshift prediction is lower. The measurements demonstrate internal consistency and robustness to calibration systematics and blending of galaxies. The precision of the cosmological constraints is mainly limited by modeling baryonic effects and intrinsic alignments.

PHYSICAL REVIEW D (2022)

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Article Astronomy & Astrophysics

Dark Energy Survey Year 3 results: Cosmological constraints from galaxy clustering and weak lensing

T. M. C. Abbott et al.

Summary: This study presents cosmology results from large-scale structure using imaging data from the Dark Energy Survey. The analysis combines three two-point correlation functions and provides consistent cosmological constraints. These results are significant for improving our understanding of cosmology.

PHYSICAL REVIEW D (2022)

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Article Astronomy & Astrophysics

KiDS-1000 cosmology: Cosmic shear constraints and comparison between two point statistics

Marika Asgari et al.

Summary: The study presents cosmological constraints using the fourth data release of the Kilo-Degree Survey (KiDS-1000), revealing tension with the Planck Legacy analysis predictions. The results from the fiducial COSEBIs analysis align well with other complementary analyses, indicating robust S-8 constraints dominated by statistical errors.

ASTRONOMY & ASTROPHYSICS (2021)

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Article Astronomy & Astrophysics

A new era of fine structure constant measurements at high redshift

Dinko Milakovic et al.

Summary: New observations of the quasar HE0515-4414 were made using the HARPS spectrograph on the ESO 3.6m telescope with the assistance of a Laser Frequency Comb (LFC). Advanced techniques such as wavelength calibration using LFC and ThAr methods, spectral modeling with Artificial Intelligence, and assigning additional model parameters for individual absorption components were employed. The results show overall consistency with no variation in the measurements.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2021)

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Article Astronomy & Astrophysics

KiDS-1000 Cosmology: Multi-probe weak gravitational lensing and spectroscopic galaxy clustering constraints

Catherine Heymans et al.

Summary: This study combines weak gravitational lensing observations from KiDS-1000, redshift-space galaxy clustering observations from BOSS, and galaxy-galaxy lensing observations from overlapping surveys to constrain the structure growth parameter S-8, resulting in a discrepancy with the Planck observations by 8.3% relative to Planck. The systematic uncertainties identified through various analyses are incorporated into the cosmological analysis, revealing a tension in the matter fluctuation amplitude parameter, sigma(8).

ASTRONOMY & ASTROPHYSICS (2021)

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Article Astronomy & Astrophysics

Cosmic Flow Measurement and Mock Sampling Algorithm of Cosmicflows-4 Tully-Fisher Catalog

Fei Qin et al.

Summary: Measurements of cosmic flows were used in this study to test cosmological models, with results showing unbiased measurements and consistency with predictions of the concordance Cold Dark Matter cosmological model.

ASTROPHYSICAL JOURNAL (2021)

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Article Astronomy & Astrophysics

Early Universe Physics Insensitive and Uncalibrated Cosmic Standards: Constraints on ωm and Implications for the Hubble Tension

Weikang Lin et al.

Summary: This study examines the possibility of resolving the Hubble tension by exploring constraints on the evolution of the cosmic background that are insensitive to early universe physics. By linking the absolute sizes of two horizons as free parameters and using cosmic standards such as CMB peak angular size, baryon acoustic oscillations, and Type Ia supernovae, strong constraints on the post-recombination cosmic background are provided. The combination of these constraints with nonlocal observations results in reduced sensitivity to early universe physics and suggests a tension between post-recombination, nonlocal observations and local measurements.

ASTROPHYSICAL JOURNAL (2021)

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Article Astronomy & Astrophysics

Overconstrained models of time delay lenses redux: how the angular tail wags the radial dog

C. S. Kochanek

Summary: When using Einstein rings to constrain the radial mass distribution of gravitational lenses, it is important to consider the angular structure of the models in order to avoid biases and obtain accurate results.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2021)

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Article Astronomy & Astrophysics

Machine learning the cosmic curvature in a model-independent way

Guo-Jian Wang et al.

Summary: This study determines the cosmic curvature Omega(K) using various methods, with the artificial neural network (ANN) method showing advantages over the Gaussian process (GP) method in overcoming prior influences. Results indicate a preference for a spatially open universe and suggest the ANN method has potential for accurate measurement of Omega(K) with a smaller error compared to other methods.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2021)

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Article Astronomy & Astrophysics

The cosmological constant as a zero action boundary

Enrique Gaztanaga

Summary: The cosmological constant Λ is proposed to correspond to a boundary term in classical General Relativity, related to average density and pressure. This explains the relation of Λ to matter density and why other contributions do not produce cosmic expansion.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2021)

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Article Astronomy & Astrophysics

Bayesian estimation of our local motion from the Planck-2018 CMB temperature map

Sayan Saha et al.

Summary: The study reveals that the local motion amplitude and direction can be inferred from the CMB dipole signal, consistent with the canonical value previously determined. However, it strongly disagrees with the conclusion of a higher local motion inferred from the CatWISE2020 quasar catalog data set.

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (2021)

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Article Astronomy & Astrophysics

A new measurement of the Hubble constant using Type la supernovae calibrated with surface brightness fluctuations

Nandita Khetan et al.

Summary: A new calibration method for the peak absolute magnitude of SNe Ia based on the SBF method was proposed, with a sample of 96 SNe Ia calibrated and the value of the Hubble constant estimated. Results showed that SNe Ia distance moduli calibrated with SBF are on average larger by 0.07 mag than those calibrated with Cepheids, indicating possible differences among SNe in different types of galaxies.

ASTRONOMY & ASTROPHYSICS (2021)

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Article Astronomy & Astrophysics

Measuring the cosmic homogeneity scale with SDSS-IV DR16 quasars

Rodrigo S. Goncalves et al.

Summary: Using the quasar sample from the sixteenth data release of the Sloan Digital Sky Survey, we found a decreasing trend in the cosmic homogeneity scale with redshift, which is in good agreement with the ΛCDM prediction. Our results confirm the presence of a homogeneity scale in the spatial distribution of quasars as predicted by the standard cosmological model.

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (2021)

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Article Astronomy & Astrophysics

Determining the range of validity of quasar X-ray and UV flux measurements for constraining cosmological model parameters

Narayan Khadka et al.

Summary: The study found that the parameters of the X-ray and UV luminosities relation for the full QSO data set depend on the cosmological model used. Subset of QSO data with lower redshifts show a relationship between X-ray and UV flux independent of cosmological model, which can be used to constrain cosmological parameters. The cosmological constraints from these lower redshift QSO data subsets are mostly consistent with other measurements but weaker in strength.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2021)

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Article Astronomy & Astrophysics

Cosmological implications of the anisotropy of ten galaxy cluster scaling relations

K. Migkas et al.

Summary: Most cosmological studies adopt the hypothesis of isotropic and homogeneous late Universe, but there may be uncertainties; scaling relations of galaxy clusters can be used to test these assumptions; a study found a 9% spatial variation in the local H-0.

ASTRONOMY & ASTROPHYSICS (2021)

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Article Astronomy & Astrophysics

The Hubble Constant from Infrared Surface Brightness Fluctuation Distances*

John P. Blakeslee et al.

Summary: A measurement of the Hubble constant H (0) was presented using surface brightness fluctuation distances for 63 bright, mainly early-type galaxies out to 100 Mpc. The result derived from a weighted average of Cepheid and TRGB calibrations is H (0) = 73.3 +/- 0.7 +/- 2.4 km s(-1) Mpc(-1), consistent with recent measurements from other methods. Systematic uncertainties could be reduced below 2% by calibrating the SBF method with precise TRGB distances for a statistical sample of massive early-type galaxies.

ASTROPHYSICAL JOURNAL (2021)

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Article Astronomy & Astrophysics

On the Hubble Constant Tension in the SNe Ia Pantheon Sample

M. G. Dainotti et al.

Summary: By analyzing the tension between Type Ia supernovae and Planck measurements regarding the Hubble constant, it was found that the Hubble constant evolves with redshift, showing a slowly decreasing trend. This trend may be attributed to astrophysical selection effects or modified gravity.

ASTROPHYSICAL JOURNAL (2021)

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Article Astronomy & Astrophysics

Multipole decomposition of the general luminosity distance 'Hubble law' - a new framework for observational cosmology

Asta Heinesen

Summary: The article presents a luminosity distance series expansion to third order in redshift for a general space-time, using physically interpretable multipole coefficients to express the coefficients of the general 'Hubble law'. The multipole terms can replace parameters of the Friedmann-Lemaitre-Robertson-Walker metric, allowing for a model-independent determination of dynamical degrees of freedom in the cosmic neighborhood of the observer. This provides a new framework with broad applications in observational cosmology.

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (2021)

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Article Astronomy & Astrophysics

The persistence of large scale structures. Part I. Primordial non-Gaussianity

Matteo Biagetti et al.

Summary: The study presents an analysis pipeline utilizing persistent homology to characterize the topology of large scale structure and extract cosmological constraints. By examining the impact of primordial local non-Gaussianity on dark matter halo distribution through N-body simulations, they detected non-zero f(NL)(loc) on multiple cubic volumes. The method effectively addresses degeneracies between different topological signatures and provides interpretable statistics for both reproducing previous results and making new predictions.

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (2021)

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Article Astronomy & Astrophysics

Explaining cosmological anisotropy: evidence for causal horizons from CMB data

Pablo Fosalba et al.

Summary: This paper analyzes the origin of power asymmetry and statistical anisotropy on the largest scales of the universe, as observed in cosmic microwave background and large-scale structure data, and finds evidence for violations of the Cosmological principle of isotropy. The detected anisotropy is related to large-scale directional cosmological parameter variations across the CMB sky, suggesting the existence of finite and casually disjoint horizons across the observable universe.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2021)

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Article Astronomy & Astrophysics

Measurement on the cosmic curvature using the Gaussian process method

Yingjie Yang et al.

Summary: This study used a model-independent method to investigate cosmic curvature and found that the universe may be spatially flat, consistent with the Λ cold dark matter (ΛCDM) model.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2021)

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Article Astronomy & Astrophysics

Our Peculiar Motion Inferred from Number Counts of Mid Infra Red AGNs and the Discordance Seen with the Cosmological Principle

Ashok K. Singal

Summary: According to the Cosmological Principle, the Universe is isotropic, but due to observer's motion, dipole anisotropies may appear in observed properties, indicating a possible preferred direction in the Universe. Despite different methods and techniques used, observed dipole anisotropies suggest a common direction, potentially implying a genuine anisotropy in the Universe that challenges the Cosmological Principle.

UNIVERSE (2021)

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Article Astronomy & Astrophysics

Cosmic radio dipole: Estimators and frequency dependence

Thilo M. Siewert et al.

Summary: The study used simulated source count maps to test the observed cosmic radio dipole, finding a superiority in the quadratic estimator. Across four radio source catalogues, an increasing dipole amplitude with decreasing frequency was observed, exceeding expectations derived from the CMB dipole.

ASTRONOMY & ASTROPHYSICS (2021)

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Article Astronomy & Astrophysics

Zipf's law for cosmic structures: How large are the greatest structures in the universe?

Giordano De Marzo et al.

Summary: The statistical characterization of the distribution of visible matter in the universe is a central problem in modern cosmology. By considering the size distribution of superclusters of galaxies and leveraging the Zipf-Mandelbrot law, the study assesses the problem of how large the greatest structures in the universe are. The finding suggests that structures larger than the observed superclusters are expected to be found when deeper redshift surveys are completed.

ASTRONOMY & ASTROPHYSICS (2021)

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Article Astronomy & Astrophysics

Local alignments of parsec-scale AGN radiojets

N. Mandarakas et al.

Summary: The study investigates the potential alignment of parsec-scale radio jets in localized regions, revealing significant alignments in four regions at a level of more than 5 sigma. The discovered regions may designate some of the largest structures known to date.

ASTRONOMY & ASTROPHYSICS (2021)

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Article Astronomy & Astrophysics

Measurements of the Hubble Constant: Tensions in Perspective*

Wendy L. Freedman

Summary: Recent advancements in measuring the distances to nearby galaxies have led to improved calibrations of the tip of the red giant branch (TRGB) method, resulting in consistent values for the Hubble constant. The TRGB results show no statistically significant difference with values determined from the cosmic microwave background, and are also in agreement with other calibration methods such as SHoES and Spitzer plus Hubble Space Telescope (HST) Key Project Cepheid calibrations. The simplicity and small systematic uncertainties of the TRGB method make it a promising tool for exploring cosmological models without the need for additional physics beyond the standard (?CDM) cosmological model.

ASTROPHYSICAL JOURNAL (2021)

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Article Astronomy & Astrophysics

Does Hubble tension signal a breakdown in FLRW cosmology?

C. Krishnan et al.

Summary: The study focuses on reanalyzing the Hubble tension with a recent age of the Universe constraint, finding that low redshift data and well-motivated priors only permit a dark energy sector close to the cosmological constant, ruling out late Universe modifications within FLRW. Future data, especially strongly lensed quasar data, could provide further confirmation of this resolution.

CLASSICAL AND QUANTUM GRAVITY (2021)

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Article Astronomy & Astrophysics

Is there really a Hubble tension?

Mohamed Rameez et al.

Summary: The discrepancies between SNe Ia datasets in the Pantheon and JLA compilations undermine the claimed 'Hubble tension'. Furthermore, there is a systematic variation of the Hubble constant by approximately 6-9 km s(-1) Mpc(-1) across the sky seen in multiple datasets, indicating that it cannot be measured locally to better than approximately 10% in a model-independent manner.

CLASSICAL AND QUANTUM GRAVITY (2021)

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Article Astronomy & Astrophysics

The variance of the CMB temperature gradient: a new signature of a multiply connected Universe

Ralf Aurich et al.

Summary: This study investigates the standard deviation of the CMB temperature gradient field as a signature for a multiply connected nature of the Universe. It shows that Universe models with non-trivial topology like toroidal space exhibit similar behavior in two-point correlation function as observed in Planck CMB maps. Additionally, the study tests the homogeneity and isotropy of different torus sizes in CMB map ensembles, revealing a similar weak level of anisotropy as in the standard cosmological model.

CLASSICAL AND QUANTUM GRAVITY (2021)

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Review Astronomy & Astrophysics

In the realm of the Hubble tension-a review of solutions *

Eleonora Di Valentino et al.

Summary: There are significant discrepancies in predictions of the Hubble constant, leading to various proposed solutions including new physics theories or modifications to existing cosmological models. Some solutions successfully reduce tension and improve agreement with data, while many others fail to do so, highlighting the need for further research and evidence.

CLASSICAL AND QUANTUM GRAVITY (2021)

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Book Review Engineering, Electrical & Electronic

Computational Topology for Biomedical Images and Data: Theory and Applications, first edition

Pratyush Pranav

IEEE SIGNAL PROCESSING MAGAZINE (2021)

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Article Astronomy & Astrophysics

Large-scale clustering amongst Fermi blazars; evidence for axis alignments?

M. J. M. Marcha et al.

Summary: Evidence for large-scale clustering is found among Fermi-selected BL Lac objects, but not among Fermi-selected FSRQs. High-latitude Fermi sources as a whole show a significant clustering signal on scales up to 30 degrees, while this signal may be washed out in FSRQs.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2021)

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Article Astronomy & Astrophysics

Peculiar-velocity cosmology with Types Ia and II supernovae

Benjamin E. Stahl et al.

Summary: The study presents a compilation of 775 low-redshift Type Ia and II supernovae samples, with 137 SN Ia distances derived through a newly developed method. By using these supernovae samples as tracers for peculiar-velocity field, researchers compared them against the 2M++ galaxy redshift survey reconstruction, leading to measurements of cosmological parameters and external bulk flow velocities.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2021)

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Article Astronomy & Astrophysics

Persistent homology of the cosmic web - I. Hierarchical topology in ΛCDM cosmologies

Georg Wilding et al.

Summary: By utilizing multiscale topological data analysis tools, this study tracks the evolution of connectivity and topological structure changes in the cosmic web through Betti number curves and persistence diagrams. The persistence diagrams provide a higher level of information on the structure formation process compared to global summary statistics.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2021)

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Article Physics, Multidisciplinary

First Constraints on the Intrinsic CMB Dipole and Our Velocity with Doppler and Aberration

Pedro da Silveira Ferreira et al.

Summary: By measuring the Doppler and aberration effects on the cosmic microwave background (CMB) independently using Planck 2018 data, we obtained new constraints on the intrinsic CMB dipole and estimated the peculiar velocity of the Solar System. The results suggest that the peculiar velocity hypothesis of the CMB dipole is consistent with the data.

PHYSICAL REVIEW LETTERS (2021)

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Article Astronomy & Astrophysics

Redshift drift cosmography for model-independent cosmological inference

Asta Heinesen

Summary: In this study, a cosmographic framework has been developed to analyze redshift drift signals of nearby sources without assumptions about the metric description of the Universe. The position drift of sources is found to be intricately linked to the redshift drift signal, which can be formulated in terms of an effective deceleration parameter. This framework enables model-independent data analysis based on a finite set of physically interpretable coefficients representing the anisotropic redshift drift signal at lowest order in redshift.

PHYSICAL REVIEW D (2021)

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Article Astronomy & Astrophysics

Geometrical meaning of statistical isotropy of smooth random fields in two dimensions

Pravabati Chingangbam et al.

Summary: This study revisits the geometrical meaning of statistical isotropy in two-dimensional smooth random fields, using the contour Minkowski tensor as a tool. The research shows that W-1 can map arbitrary shaped simple closed curves to unique ellipses and contains additional information about the orientation of structures. The results provide insights for designing tests of statistical isotropy using cosmological data.

PHYSICAL REVIEW D (2021)

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Article Astronomy & Astrophysics

Complementary consistency test of the Copernican principle via Noether's theorem and machine learning forecasts

Ruben Arjona et al.

Summary: The paper presents a new test of the Copernican principle by relating the distance and expansion rate using Noether's theorem. By simulating upcoming galaxy survey data, it is shown that the test can effectively constrain deviations from the cosmological constant model.

PHYSICAL REVIEW D (2021)

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Article Astronomy & Astrophysics

Hubble tension or a transition of the Cepheid SnIa calibrator parameters?

Leandros Perivolaropoulos et al.

Summary: The reanalysis of Cepheid data revealed hints of mismatch between low and high galactic distance parameters. Utilizing model selection criteria favored model IV, with best-fit values consistent with cosmic background calibration, indicating absence of the Hubble crisis under this model.

PHYSICAL REVIEW D (2021)

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Article Astronomy & Astrophysics

Most constraining cosmological neutrino mass bounds

Eleonora Di Valentino et al.

Summary: By utilizing the most recent cosmological data sets, we have established the most constraining upper limit on neutrino mass to date, setting it at 0.09 eV at 95% confidence level. This challenges the viability of the inverted mass ordering as the underlying neutrino mass pattern. The results further support the use of large multitracer spectroscopic surveys as unique laboratories for studying cosmological relics like neutrinos.

PHYSICAL REVIEW D (2021)

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Article Astronomy & Astrophysics

Disentangling Doppler modulation, aberration and the temperature dipole in the CMB

Pedro da Silveira Ferreira et al.

Summary: In order to accurately measure the intrinsic dipole of CMB, it is crucial to consider both aberration and Doppler effects, as well as to remove spurious couplings caused by unit conversion. The proposed pipeline in this study provides independent and unbiased estimators with uncertainties comparable to theoretical expectations.

PHYSICAL REVIEW D (2021)

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Article Astronomy & Astrophysics

Large-scale asymmetry in galaxy spin directions: evidence from the Southern hemisphere

Lior Shamir

Summary: Recent observations have shown asymmetry in the distribution of galaxies by spin directions as observed from Earth, with strong agreement between opposite parts of the sky. This is not only the largest study to date focusing on the Southern hemisphere, but also reveals a nearly identical large-scale profile of asymmetry among the four telescopes.

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA (2021)

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Article Astronomy & Astrophysics

Measurements of the E-mode polarization and temperature-E-mode correlation of the CMB from SPT-3G 2018 data

D. Dutcher et al.

Summary: In this study, measurements of the E-mode polarization power spectrum and temperature-E-mode cross-power spectrum of the cosmic microwave background were presented using data collected by SPT-3G. The results improve upon previous findings, providing constraints on cosmological parameters and showing a good fit with the.aCDM cosmological model. Combining the SPT-3G and Planck data sets led to tighter constraints on the aCDM model without significant shifts in central values.

PHYSICAL REVIEW D (2021)

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Article Astronomy & Astrophysics

Application of the contour Minkowski tensor and D statistic to the Planck E-mode data

Joby P. Kochappan et al.

Summary: The statistical isotropy of the E-mode polarization of the cosmic microwave background radiation observed by the Planck satellite was tested using the alpha estimator and directional statistic. Results showed good agreement between the Planck data and simulations in terms of statistical properties.

PHYSICAL REVIEW D (2021)

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Article Astronomy & Astrophysics

Running Hubble tension and a H0 diagnostic

C. Krishnan et al.

Summary: Hubble tension refers to the mismatch between the locally determined Hubble constant H-0 and the value inferred from flat CDM cosmology. This tension arises from cosmological origins and predicts variations in H-0, potentially related to differences between the FLRW cosmology framework and the standard model. An introduced diagnostic can track these variations in H-0.

PHYSICAL REVIEW D (2021)

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Article Astronomy & Astrophysics

Question of measuring spatial curvature in an inhomogeneous universe

Chi Tian et al.

Summary: This study examines the behavior of curvature modes on hypersurfaces of an inhomogeneous spacetime in a nonperturbative numerical relativistic setting, and compares it with the curvature inferred by observers. The observations become sensitive to the impact of curvature sourced by inhomogeneities on inferred average properties, showing general agreement with past literature.

PHYSICAL REVIEW D (2021)

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Article Astronomy & Astrophysics

Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Cosmological implications from two decades of spectroscopic surveys at the Apache Point Observatory

Shadab Alam et al.

Summary: Based on the final measurements of clustering using galaxies, quasars, and Ly alpha forests from the SDSS lineage, this study provides comprehensive cosmological implications. The BAO data alone can rule out dark-energy-free models, and when combined with other measurements, significant improvements are made on constraining cosmological parameters within the ΛCDM model. The results indicate that various parameter extensions remain consistent with a ΛCDM model in a combined analysis, showing precision changes of less than 0.6% in key parameters.

PHYSICAL REVIEW D (2021)

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Article Astronomy & Astrophysics

Hubble sinks in the low-redshift swampland

A. Banerjee et al.

Summary: Local determinations of the Hubble constant H-0 based on low redshift data favor quintessence models that lower H-0 relative to Lambda CDM. Additionally, results show that an exponential coupling to dark matter cannot alter this conclusion in the same redshift range. This leaves open the possibility that a coupling in the matter-dominated epoch, potentially even in the dark ages, may yet save H-0 from sinking in the string theory swampland.

PHYSICAL REVIEW D (2021)

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Article Astronomy & Astrophysics

Constraining cosmological and galaxy parameters using strong gravitational lensing systems

Darshan Kumar et al.

Summary: The study uses strong gravitational lensing systems to constrain cosmological parameters and galaxy density profiles, indicating a possibly closed or open universe, with minimal impact of parametrizations on the mass density power-law index.

PHYSICAL REVIEW D (2021)

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Article Astronomy & Astrophysics

A Test of the Cosmological Principle with Quasars

Nathan J. Secrest et al.

Summary: The study reveals that the direction of the dipole in the quasar sky is similar to that of the cosmic microwave background (CMB), but its amplitude is over twice as large as expected, rejecting the canonical interpretation of the CMB dipole. This conflicts with the cosmological principle, a foundational assumption of the concordance ΛCDM model.

ASTROPHYSICAL JOURNAL LETTERS (2021)

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Article Astronomy & Astrophysics

Spin Parity of Spiral Galaxies. III. Dipole Analysis of the Distribution of SDSS Spirals with 3D Random Walk Simulations

Masanori Iye et al.

Summary: The study on the distribution of spiral galaxies from the Sloan Digital Sky Survey (SDSS) reveals a certain level of dipole asymmetry, but after removing duplicate entries, the actual dipole asymmetry observed is quite modest, supporting the conclusion that the distribution of the spin vector of galaxies in the local universe is random, as indicated by the data.

ASTROPHYSICAL JOURNAL (2021)

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Article Astronomy & Astrophysics

Planck 2018 results: VII. Isotropy and statistics of the CMB

Y. Akrami et al.

ASTRONOMY & ASTROPHYSICS (2020)

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Article Astronomy & Astrophysics

Planck 2018 results: I. Overview and the cosmological legacy of Planck

N. Aghanim et al.

ASTRONOMY & ASTROPHYSICS (2020)

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Article Astronomy & Astrophysics

Planck evidence for a closed Universe and a possible crisis for cosmology

Eleonora Di Valentino et al.

NATURE ASTRONOMY (2020)

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Article Astronomy & Astrophysics

Global alignments of parsec-scale AGN radio jets and their polarization planes

D. Blinov et al.

ASTRONOMY & ASTROPHYSICS (2020)

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Article Astronomy & Astrophysics

Quantifying the accuracy of the Alcock-Paczynski scaling of baryon acoustic oscillation measurements

Asta Heinesen et al.

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (2020)

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Article Astronomy & Astrophysics

Overconstrained gravitational lens models and the Hubble constant

C. S. Kochanek

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2020)

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Review Astronomy & Astrophysics

In the Quest for Cosmic Rotation

Vladimir A. Korotky et al.

UNIVERSE (2020)

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Article Astronomy & Astrophysics

Probing cosmic isotropy with a new X-ray galaxy cluster sample through the LX-T scaling relation

K. Migkas et al.

ASTRONOMY & ASTROPHYSICS (2020)

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Article Astronomy & Astrophysics

TDCOSMO: I. An exploration of systematic uncertainties in the inference of H0 from time-delay cosmography

M. Millon et al.

ASTRONOMY & ASTROPHYSICS (2020)

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Article Astronomy & Astrophysics

Planck 2018 results: VI. Cosmological parameters

N. Aghanim et al.

ASTRONOMY & ASTROPHYSICS (2020)

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Article Astronomy & Astrophysics

Solving the curvature and Hubble parameter inconsistencies through structure formation-induced curvature

Asta Heinesen et al.

CLASSICAL AND QUANTUM GRAVITY (2020)

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A bound on the C-12/C-13 ratio in near-pristine gas with ESPRESSO

Louise Welsh et al.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2020)

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Article Astronomy & Astrophysics

The size of our causal Universe

Enrique Gaztanaga

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2020)

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Article Astronomy & Astrophysics

Re-examining the evidence of the Hercules-Corona Borealis Great Wall

Sam Christian

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2020)

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Article Astronomy & Astrophysics

STRIDES: a 3.9 per cent measurement of the Hubble constant from the strong lens system DES J0408-5354

A. J. Shajib et al.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2020)

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Article Astronomy & Astrophysics

H0LiCOW-XIII. A 2.4 per cent measurement of H0 from lensed quasars: 5.3σ tension between early- and late-Universe probes

Kenneth C. Wong et al.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2020)

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Article Multidisciplinary Sciences

Four direct measurements of the fine-structure constant 13 billion years ago

Michael R. Wilczynska et al.

SCIENCE ADVANCES (2020)

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Article Astronomy & Astrophysics

Patterns of galaxy spin directions in SDSS and Pan-STARRS show parity violation and multipoles

Lior Shamir

ASTROPHYSICS AND SPACE SCIENCE (2020)

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Article Astronomy & Astrophysics

Cosmic structures from a mathematical perspective 1: dark matter halo mass density profiles

Jenny Wagner

GENERAL RELATIVITY AND GRAVITATION (2020)

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Article Astronomy & Astrophysics

Quasars as standard candles: III. Validation of a new sample for cosmological studies

E. Lusso et al.

ASTRONOMY & ASTROPHYSICS (2020)

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Alignment in the orientation of LOFAR radio sources

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Pengjie Zhang et al.

PHYSICAL REVIEW LETTERS (2011)

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Indications of a Spatial Variation of the Fine Structure Constant

J. K. Webb et al.

PHYSICAL REVIEW LETTERS (2011)

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Detection of a dipole in the handedness of spiral galaxies with redshifts z ∼ 0.04

Michael J. Longo

PHYSICS LETTERS B (2011)

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Is the Universe homogeneous?

Roy Maartens

PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES (2011)

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EMU: Evolutionary Map of the Universe

Ray P. Norris et al.

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA (2011)

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THE WIDE-FIELD INFRARED SURVEY EXPLORER (WISE): MISSION DESCRIPTION AND INITIAL ON-ORBIT PERFORMANCE

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ASTRONOMICAL JOURNAL (2010)

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Disks in the sky: A reassessment of the WMAP cold spot

Ray Zhang et al.

ASTROPARTICLE PHYSICS (2010)

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THE ERROR BUDGET OF THE DARK FLOW MEASUREMENT

F. Atrio-Barandela et al.

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BAYESIAN ANALYSIS OF AN ANISOTROPIC UNIVERSE MODEL: SYSTEMATICS AND POLARIZATION

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COSMIC FLOW FROM TWO MICRON ALL-SKY REDSHIFT SURVEY: THE ORIGIN OF COSMIC MICROWAVE BACKGROUND DIPOLE AND IMPLICATIONS FOR ACDM COSMOLOGY

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A NEW MEASUREMENT OF THE BULK FLOW OF X-RAY LUMINOUS CLUSTERS OF GALAXIES

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Searching for a cosmological preferred axis: Union2 data analysis and comparison with other probes

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CMB observations in LTB universes. Part II: the kSZ effect in an LTB universe

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Rendering dark energy void

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Power asymmetries in the cosmic microwave background temperature and polarization patterns

F. Paci et al.

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Does the Universe accelerate equally in all directions?

Ryan Cooke et al.

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Fractal dimension as a measure of the scale of homogeneity

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Cosmic flows on 100 h-1 Mpc scales: standardized minimum variance bulk flow, shear and octupole moments

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Asymmetric beams and CMB statistical anisotropy

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PHYSICAL REVIEW D (2010)

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Model independent tests of the standard cosmological model

Arman Shafieloo et al.

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Cosmic age test in inhomogeneous cosmological models mimicking ΛCDM on the light cone

Mi-Xiang Lan et al.

PHYSICAL REVIEW D (2010)

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Anomalous parity asymmetry of WMAP 7-year power spectrum data at low multipoles: Is it cosmological or systematics?

Jaiseung Kim et al.

PHYSICAL REVIEW D (2010)

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Can Primordial Magnetic Fields Seeded by Electroweak Strings Cause an Alignment of Quasar Axes on Cosmological Scales?

Robert Poltis et al.

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Testing Gaussianity, Homogeneity, and Isotropy with the Cosmic Microwave Background

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ADVANCES IN ASTRONOMY (2010)

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BAYESIAN ANALYSIS OF SPARSE ANISOTROPIC UNIVERSE MODELS AND APPLICATION TO THE FIVE-YEAR WMAP DATA

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DETECTING THE COSMIC DIPOLE ANISOTROPY IN LARGE-SCALE RADIO SURVEYS

Fronefield Crawford

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THE STATISTICAL SIGNIFICANCE OF THE DARK FLOW

Ryan Keisler

ASTROPHYSICAL JOURNAL LETTERS (2009)

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INCREASING EVIDENCE FOR HEMISPHERICAL POWER ASYMMETRY IN THE FIVE-YEAR WMAP DATA

J. Hoftuft et al.

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A MEASUREMENT OF LARGE-SCALE PECULIAR VELOCITIES OF CLUSTERS OF GALAXIES: TECHNICAL DETAILS

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POWER ASYMMETRY IN COSMIC MICROWAVE BACKGROUND FLUCTUATIONS FROM FULL SKY TO SUB-DEGREE SCALES: IS THE UNIVERSE ISOTROPIC?

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FIVE-YEAR WILKINSON MICROWAVE ANISOTROPY PROBE OBSERVATIONS: DATA PROCESSING, SKY MAPS, AND BASIC RESULTS

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Galaxy distribution and extreme-value statistics

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Consistency among distance measurements: transparency, BAO scale and accelerated expansion

Anastasios Avgoustidis et al.

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Signals of statistical anisotropy in WMAP foreground-cleaned maps

Pramoda Kumar Samal et al.

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The study of topology of the Universe using multipole vectors

P. Bielewicz et al.

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Consistently large cosmic flows on scales of 100 h-1 Mpc: a challenge for the standard ΛCDM cosmology

Richard Watkins et al.

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Rogues' gallery: The full freedom of the Bianchi CMB anomalies

Andrew Pontzen

PHYSICAL REVIEW D (2009)

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Average observational quantities in the timescape cosmology

David L. Wiltshire

PHYSICAL REVIEW D (2009)

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Testing backreaction effects with observations

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PHYSICAL REVIEW D (2009)

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Estimators for CMB statistical anisotropy

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PHYSICAL REVIEW D (2009)

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Possibility of Detecting Anisotropic Expansion of the Universe by Very Accurate Astrometry Measurements

Claudia Quercellini et al.

PHYSICAL REVIEW LETTERS (2009)

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A MEASUREMENT OF LARGE-SCALE PECULIAR VELOCITIES OF CLUSTERS OF GALAXIES: RESULTS AND COSMOLOGICAL IMPLICATIONS

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Our peculiar motion away from the local void

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Accelerating cosmologies with an anisotropic equation of state

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Can the Copernican principle be tested using the cosmic neutrino background?

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Looking the void in the eyes -: the kinematic Sunyaev-Zeldovich effect in Lemaitre-Tolman-Bondi models

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Hemispherical power asymmetry: parameter estimation from cosmic microwave background WMAP5 data

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A low cosmic microwave background variance in the Wilkinson Microwave Anisotropy Probe data

C. Monteserin et al.

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A semi-empirical simulation of the extragalactic radio continuum sky for next generation radio telescopes

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Galaxy Zoo: the large-scale spin statistics of spiral galaxies in the Sloan Digital Sky Survey

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Time drift of cosmological redshifts and its variance

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PHYSICAL REVIEW D (2008)

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PHYSICAL REVIEW D (2008)

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PHYSICAL REVIEW LETTERS (2008)

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PHYSICAL REVIEW LETTERS (2008)

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PHYSICAL REVIEW LETTERS (2008)

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The second epoch molonglo galactic plane survey: Compact source catalogue

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NEW JOURNAL OF PHYSICS (2007)

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Bianchi model CMB polarization and its implications for CMB anomalies

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Anisotropy in the Hubble constant as observed in the HST extragalactic distance scale key project results

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A survey of polarization in the JVAS/CLASS flat-spectrum radio source surveys - II. A search for aligned radio polarizations

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Testing the Λ cold dark matter model (and more) with the time evolution of the redshift

Kayll Lake

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Hemispherical power asymmetry in the third-year Wilkinson Microwave Anisotropy Probe sky maps

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Evolution of polarization orientations in a flat universe with vector perturbations:: CMB and quasistellar objects

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Ellipsoidal universe can solve the cosmic microwave background quadrupole problem

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On the viability of Bianchi type VIIh models with dark energy

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The non-Gaussian cold spot in Wilkinson Microwave Anisotropy Probe:: significance, morphology and foreground contribution

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Multipole vector anomalies in the first-year WMAP data:: A cut-sky analysis

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Testing homogeneity on large scales in the Sloan Digital Sky Survey Data Release One

J Yadav et al.

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Detection of the baryon acoustic peak in the large-scale correlation function of SDSS luminous red galaxies

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Is the universe odd?

K Land et al.

PHYSICAL REVIEW D (2005)

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Spontaneous isotropy breaking: A mechanism for CMB multipole alignments

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Mapping extreme-scale alignments of quasar polarization vectors

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Higher criticism statistic:: detecting and identifying non-Gaussianity in the WMAP first-year data

L Cayón et al.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2005)

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Evidence of vorticity and shear at large angular scales in the WMAP data:: A violation of cosmological isotropy?

TR Jaffe et al.

ASTROPHYSICAL JOURNAL (2005)

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A high-significance detection of non-Gaussianity in the Wilkinson Microwave Anisotropy Probe 1-yr data using directional spherical wavelets

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Probing light pseudoscalars with light propagation, resonance and spontaneous polarization

S Das et al.

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A map of the universe

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Cosmic homogeneity demonstrated with luminous red galaxies

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New optical polarization measurements of quasi-stellar objects.: The data

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ASTRONOMY & ASTROPHYSICS (2005)

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HEALPix:: A framework for high-resolution discretization and fast analysis of data distributed on the sphere

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ASTROPHYSICAL JOURNAL (2005)

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Detection of a non-Gaussian spot in WMAP

M Cruz et al.

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Asymmetries in the cosmic microwave background anisotropy field

HK Eriksen et al.

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Non-Gaussian signatures in the temperature fluctuation observed by the Wilkinson Microwave Anisotropy Probe

CG Park

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Significance of the largest scale CMB fluctuations in WMAP

A de Oliveira-Costa et al.

PHYSICAL REVIEW D (2004)

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Large-scale alignment of optical polarizations from distant QSOs using coordinate-invariant statistics

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Wavelets and Wilkinson Microwave Anisotropy Probe non-Gaussianity

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Testing for non-gaussianity in the Wilkinson Microwave Anisotropy Probe data:: Minkowski functionals and the length of the skeleton

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ASTROPHYSICAL JOURNAL (2004)

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Streaming motions of galaxy clusters within 12 000 km s-1 -: V.: The peculiar velocity field

MJ Hudson et al.

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Detection of non-gaussianity in the Wilkinson Microwave Anisotropy Probe first-year data using spherical wavelets

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Is the low-l microwave background cosmic? -: art. no. 221301

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Cosmic acceleration versus axion-photon mixing

BA Bassett et al.

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Testing the cosmological principle of isotropy:: local power-spectrum estimates of the WMAP data

FK Hansen et al.

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The virgo alignment puzzle in propagation of radiation on cosmological scales

JP Ralston et al.

INTERNATIONAL JOURNAL OF MODERN PHYSICS D (2004)

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Cosmic distance-duality as a probe of exotic physics and acceleration

BA Bassett et al.

PHYSICAL REVIEW D (2004)

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The microJansky and nanoJansky population

RA Windhorst

NEW ASTRONOMY REVIEWS (2003)

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First-year Wilkinson Microwave Anisotropy Probe (WMAP) observations:: Preliminary maps and basic results

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SUMSS: a wide-field radio imaging survey of the southern sky - II. The source catalogue

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Measuring the statistical isotropy of the cosmic microwave background anisotropy

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Topological persistence and simplification

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DISCRETE & COMPUTATIONAL GEOMETRY (2002)

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Electromagnetic polarization effects due to axion-photon mixing

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Constraining cosmological parameters based on relative galaxy ages

R Jimenez et al.

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Effects of the intergalactic plasma on supernova dimming via photon-axion oscillations

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PHYSICS LETTERS B (2002)

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Dimming supernovae without cosmic acceleration -: art. no. 161302

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PHYSICAL REVIEW LETTERS (2002)

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A velocity dipole in the distribution of radio galaxies

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NATURE (2002)

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The bulk motion of flat galaxies on scales of 100 Mpc in the quadrupole and octupole approximations

SL Parnovsky et al.

ASTRONOMY LETTERS-A JOURNAL OF ASTRONOMY AND SPACE ASTROPHYSICS (2001)

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Final results from the Hubble Space Telescope key project to measure the Hubble constant

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Confirmation of the existence of coherent orientations of quasar polarization vectors on cosmological scales

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Measuring cosmological bulk flows via the kinematic Sunyaev-Zeldovich effect in the upcoming cosmic microwave background maps

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