Related references
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Article
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Summary: The probability of primordial black hole formation is increased during the QCD crossover due to a slight reduction in the equation of state. This leads to a distinctive peak and other features in the mass distribution of primordial black holes. However, the impact of this variation has not been considered in numerical simulations of PBH formation.
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Summary: We propose a new mechanism for producing primordial black holes during a period of multi-field inflation. This mechanism requires an enhancement of primordial fluctuations at short scales compared to those at CMB scales. We show that this amplification naturally occurs when the inflationary trajectory deviates strongly from a geodesic in field space, and can subsequently produce enough primordial black holes to account for all or a fraction of dark matter. Our mechanism is applicable to inflation models in a multi-dimensional field space, as occurs in high-energy theories. We analytically and numerically study how the duration and strength of the trajectory deviation affect the primordial fluctuation power spectrum and the abundance of primordial black holes. Our mechanism offers valuable insights into the dynamics of inflation through observable features in the primordial black hole spectrum and the stochastic background of gravitational waves.
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Summary: Observing and timing millisecond pulsars with high rotational stability allows for the direct detection of gravitational waves. The Chinese Pulsar Timing Array is a collaboration aiming to detect gravitational waves using Chinese radio telescopes. This article serves as a table of contents for a series of papers related to the CPTA Data Release 1, with key results including the detection of a correlated signal and evidence for the Hellings-Downs correlation.
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Giacomo Ferrante et al.
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Review
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Pierre Auclair et al.
Summary: This publication provides an overview of the latest advancements in LISA cosmology, including theory and methods, and identifies new opportunities to probe the universe using gravitational-wave observations by LISA.
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PHYSICAL REVIEW LETTERS
(2023)
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[Anonymous]
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Daniel J. Reardon et al.
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ASTROPHYSICAL JOURNAL LETTERS
(2023)
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Adeela Afzal et al.
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Daniel J. J. Reardon et al.
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ASTROPHYSICAL JOURNAL LETTERS
(2023)
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Gabriella Agazie et al.
Summary: We present evidence for a stochastic gravitational-wave background correlated among 67 pulsars in the North American Nanohertz Observatory for Gravitational Waves data set. This background is favored over models with only independent pulsar noises, and is consistent with expectations for a signal from a population of supermassive black hole binaries.
ASTROPHYSICAL JOURNAL LETTERS
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Gabriella Agazie et al.
Summary: This article presents observations and timing analyses of 68 millisecond pulsars from the 15 year data set of the NANOGrav experiment. The study shows evidence for a stochastic gravitational wave background and improves the overall quality of the data set by adding new pulsars and extending the timing baselines. It also provides a full suite of software for reproducing data reduction, analysis, and results.
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Virgile Dandoy et al.
Summary: In this study, we perform a Bayesian search in the latest Pulsar Timing Array datasets to search for a stochastic gravitational wave background sourced by curvature perturbations. We find that the astrophysical model is favored by the International PTA Data Release 2, while both interpretations fit the NANOgrav 12.5 years dataset equally well. We also set new upper limits on the amplitude of the curvature power spectrum at small scales, which are competitive with indirect astrophysical bounds.
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Giacomo Ferrante et al.
Summary: We present a comprehensive formalism for computing the abundance of primordial black holes (PBHs) with local non-Gaussianity (NG) in the curvature perturbation field. We go beyond the traditional quadratic and cubic approximations and consider a generic functional form for NG. Our approach considers both narrow and broad power spectra. We show that the conventional perturbative approach is only reliable for narrow spectra, while for broad spectra, nonperturbative computations are necessary to obtain accurate results.
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Zhi-Qiang You et al.
Summary: The stochastic signal detected by pulsar timing arrays can be explained by scalar-induced gravitational waves. By parameterizing the power spectrum and using Bayesian inference, it is found that there is no significant evidence to distinguish between single-peak and double-peak models for the scalar-induced gravitational waves. The current sensitivity of pulsar timing arrays is not sufficient to differentiate the shapes of the power spectrum of the primordial curvature perturbations.
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J. Antoniadis et al.
Summary: In this study, we searched for an isotropic stochastic gravitational wave background using the second data release of the International Pulsar Timing Array. We found evidence for a spectrally similar low-frequency stochastic process and demonstrated that the combined international data set is more sensitive. Although no significant evidence of a gravitational-wave origin was found, future international data releases are expected to increase sensitivity and detection probability.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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Guillem Domenech et al.
Summary: Recently, the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) claimed the first detection of the stochastic background of gravitational waves (GWs) through their analysis of pulsar timing array (PTA) time residuals. They found that these waves could be secondary GWs induced by peaked curvature perturbation in a dust-like post inflationary era with a power index, w, ranging from -0.091 to 0.048. The presence of the stochastic background of GWs also predicts the existence of planet-mass primordial black holes (PBHs), which could explain the ultrashort-timescale microlensing events observed by the Optical Gravitational Lensing Experiment (OGLE).
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2022)
Review
Astronomy & Astrophysics
Albert Escriva
Summary: This review article presents the current results and developments on the conditions for primordial black hole formation and its numerical simulation. The article focuses on different results regarding the threshold and black hole mass using different sets of curvature fluctuations, and contrasts them with analytical estimations.
Article
Astronomy & Astrophysics
Guillem Domenech et al.
Summary: This study derives the analytical framework to compute the stochastic gravitational wave background induced by small-scale primordial cold dark matter isocurvature fluctuations. It is found that large isocurvature fluctuations can produce observable gravitational wave signals, with a spectrum distinct from adiabatic perturbations. Future gravitational wave detectors are expected to significantly improve constraints on small-scale dark matter isocurvature.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
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Astronomy & Astrophysics
Lukas T. Witkowski et al.
Summary: This study investigates how the oscillatory frequency profile of the scalar-induced contribution to the stochastic gravitational wave background is influenced by the expansion history of the post-inflationary universe. The results show that the frequencies and amplitudes of the oscillatory contributions are affected by the equation of state, and provide information about both inflationary physics and the post-inflationary expansion history.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
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Astronomy & Astrophysics
Sam Young
Summary: In this study, we reassess the impact of local-type non-Gaussianity on the abundance of primordial black holes (PBHs) and find that the effect is much less significant than previously believed. The non-Gaussianity parameters need to be significantly larger to have a similar effect as before, which weakens the constraints on PBH abundance and the primordial power spectrum dependence on non-Gaussianity parameters. Furthermore, we question the existing calculations of PBH abundance due to the correlation between curvature perturbation and compaction.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
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Shyam Balaji et al.
Summary: This paper investigates the detection of gravitational waves on the primordial spectrum of fluctuations, particularly during the inflationary phase. It finds that even if the amplitude of the gravitational waves is too small, the effects of cross terms on sharp peaks in the primordial spectrum can still be detected.
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Gabriele Franciolini et al.
Summary: Recent population studies have used gravitational-wave (GW) events detected by LVK to search for a subpopulation of primordial black holes (PBHs), and have investigated the impact of the power spectrum of cosmological perturbations on the PBH abundance and mass distribution. The results indicate that the majority of dark matter is unlikely to exist in the form of stellar mass PBHs, based on the observations from LVK.
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Gabriele Franciolini et al.
Summary: Constraining the inflationary epoch is a crucial goal in modern cosmology. This study proposes a new reverse engineering approach to connect late-time observables to consistent inflationary dynamics and the inflaton potential. Through this approach, researchers find that inflation can generate a raised plateau in the power spectrum of curvature perturbations, which connects to fundamental observables such as dark matter, stochastic gravitational waves, and primordial black hole mergers.
Article
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Albert Escriva et al.
Summary: The study shows that when the fluid filling the cosmological background is a perfect fluid with w greater than or equal to 1/3, there is a critical threshold for black hole formation that is only related to the curvature of the compaction function. For smaller w values, knowledge of the full shape of the compaction function is necessary.
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Peter Adshead et al.
Summary: We studied the impact of scalar metric fluctuations on the generation of gravitational waves, emphasizing the role of primordial non-Gaussianity, especially the disconnected and connected components of the primordial trispectrum. By calculating all contributions, we obtained results for various enhanced primordial curvature power spectra.
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(2021)
Correction
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S. Chen et al.
Summary: This study searched for a stochastic gravitational-wave background (GWB) using data from six radio millisecond pulsars, finding spectral properties consistent with theoretical predictions but lacking the required HD correlation for GWB detection. The most favored model was found to be common uncorrelated red noise, with the results being marginally influenced by Solar system ephemeris effects.
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Andrew D. Gow et al.
Summary: The study compares constraints on the power spectrum and mass distributions of primordial black holes using different methods. Results show that, as long as the criteria for PBH formation and power spectrum smoothing are consistent, the constraints vary by only about 10%.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Review
Physics, Nuclear
Anne M. Green et al.
Summary: The detection of gravitational waves from mergers of tens of Solar mass black hole binaries has sparked interest in primordial black holes as a dark matter candidate. This overview provides insights into the formation of primordial black holes, current constraints on their present day abundance, and key open questions in the field as of Summer 2020.
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Guillem Domenech et al.
Summary: Primordial black holes from the early Universe can significantly affect cosmological history. Exploring the formation mechanisms of these black holes can be done through coincidental dark radiation and density fluctuation gravitational wave signatures.
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Physics, Multidisciplinary
Bernard Carr et al.
Summary: In this article, constraints on the fraction of the Universe that may have gone into primordial black holes (PBHs) over a range of masses are updated. The discussion covers the reasons why PBHs smaller than a certain mass threshold are constrained and the various constraints on PBHs larger than that threshold.
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V De Luca et al.
Summary: The NANOGrav Collaboration recently published strong evidence for a stochastic gravitational wave background, which could be explained by second-order gravitational waves produced during the formation of primordial black holes. This research proposes two predictions: that primordial black holes may comprise the majority of dark matter and that the gravitational wave stochastic background will also be observed by the Laser Interferometer Space Antenna experiment.
PHYSICAL REVIEW LETTERS
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Ville Vaskonen et al.
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Seiji Kawamura et al.
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Kin-Wang Ng et al.
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Guillem Domenech
Summary: This review provides an overview of gravitational waves induced by primordial fluctuations, focusing on the intuitive physics and general analytical formulation behind induced gravitational waves. It suggests the open possibility of a different expansion history in the primordial universe than the commonly assumed radiation dominated cosmology, and aims to raise awareness of current advances in the cosmology of induced gravitational waves.
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Boris Goncharov et al.
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ASTROPHYSICAL JOURNAL LETTERS
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Katsuya T. Abe et al.
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Vicente Atal et al.
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Chen Yuan et al.
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