4.6 Article

Constraints on self-dual black hole in loop quantum gravity with S0-2 star in the galactic center

Related references

Note: Only part of the references are listed.
Article Astronomy & Astrophysics

The dark mass signature in the orbit of S2

G. Heissel et al.

Summary: This study explores a strategy for separating Schwarzschild precession and mass precession by pinpointing their distinct signatures within a single orbit. By analyzing the impact of extended mass on orbital elements and observables, the researchers find that a full orbit of data is necessary to constrain the dark mass. They also determine detection thresholds for different datasets and suggest that future observations can significantly improve the sensitivity to dark mass.

ASTRONOMY & ASTROPHYSICS (2022)

Article Astronomy & Astrophysics

Orbital precession of the S2 star in Scalar-Tensor-Vector Gravity

Riccardo Della Monica et al.

Summary: In this study, the parameter space of Scalar-Tensor-Vector Gravity is constrained using the motion of the S2-star. No serious tension with General Relativity is found.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2022)

Article Astronomy & Astrophysics

Unveiling the nature of SgrA* with the geodesic motion of S-stars

Riccardo Della Monica et al.

Summary: Despite the improvements in future observations, it remains difficult to determine whether the central supermassive object is a black hole or a wormhole. The study used data from the S0-2 star and simulated observations to investigate the nature of the object, but was unable to definitively distinguish between the two possibilities. However, it was found that stars orbiting closer to the object could provide valuable insights into its fundamental nature.

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (2022)

Article Astronomy & Astrophysics

Breaking of isospectrality of quasinormal modes in nonrotating loop quantum gravity black holes

Daniel del-Corral et al.

Summary: The quasinormal frequencies of three effective geometries of nonrotating regular black holes derived from loop quantum gravity are studied. The frequencies of axial and polar perturbations are computed using a WKB method and shown to differ from those of classical general relativity. Isospectrality is broken, but these deviations are very small, even for microscopic black holes, and decay with an inverse power law of the size of the mass of the black holes. Similar conclusions are reached for scalar and vector perturbations.

PHYSICAL REVIEW D (2022)

Article Astronomy & Astrophysics

Gravitational lensing by a black hole in effective loop quantum gravity

Qi-Ming Fu et al.

Summary: This paper investigates the influences of quantum effects on the weak and strong bending angles of light rays in a black hole under effective loop quantum gravity. It finds that the black hole exhibits different behaviors, such as diverging bending angle and maximum angular separation, with increasing quantum parameter. These findings are significant for understanding the quantum effects of gravity in strong gravitational fields.

PHYSICAL REVIEW D (2022)

Article Astronomy & Astrophysics

Dark energy interactions near the Galactic Center

David Benisty et al.

Summary: This study investigates scalar-tensor theories inspired by dark energy models in the strong gravity regime near the black hole at the center of our galaxy. The general conformal and disformal couplings of the scalar field to matter are considered to study the orbital behavior of nearby stars around the galactic center SgrA*. Using Markov chain Monte Carlo simulation and Bayesian analysis, constraints on the parameters of the scalar field couplings to matter are obtained for the first time in the strong gravity regime.

PHYSICAL REVIEW D (2022)

Article Astronomy & Astrophysics

Exploring Alternatives to the Hamiltonian Calculation of the Ashtekar-Olmedo-Singh Black Hole Solution

Alejandro Garcia-Quismondo et al.

Summary: This article reexamines the derivation of dynamical equations of the Ashtekar-Olmedo-Singh black hole model and proposes a more general choice for parameters to be treated as true constants of motion. The consequences of this choice are analyzed, and the compatibility of the proposed procedure with previous results is investigated. The discussion is focused solely on dynamical issues.

FRONTIERS IN ASTRONOMY AND SPACE SCIENCES (2021)

Article Astronomy & Astrophysics

Loop Quantum Black Hole Extensions Within the Improved Dynamics

Rodolfo Gambini et al.

Summary: The study reveals the existence of semi-classical states in the quantum theory that can approximate general relativity coupled to an effective anisotropic fluid, eliminating the singularity and allowing the continuation of spacetime into a white hole spacetime. This is similar to previously considered scenarios based on loop quantum gravity quantization.

FRONTIERS IN ASTRONOMY AND SPACE SCIENCES (2021)

Article Astronomy & Astrophysics

Hinting a dark matter nature of Sgr A* via the S-stars

E. A. Becerra-Vergara et al.

Summary: The motion data of S-stars around the Galactic Centre gathered in the last 28 yr suggests that Sgr A* hosts a supermassive compact object close to 4 x 10(6) solar masses, not a traditional black hole, possibly related to a core-halo distribution of dark matter termed "darkinos." By using astrometry data of S2 and G2, the alternative nature of Sgr A* as a dense core of darkinos is confirmed and extended.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2021)

Article Physics, Particles & Fields

Quasinormal modes of a massive scalar field nonminimally coupled to gravity in the spacetime of self-dual black hole

J. S. Santos et al.

Summary: In this study, the characteristic frequencies of quasinormal modes for a massive scalar field with a nonminimal coupling with gravity in the spacetime of a loop quantum black hole are calculated. The results show a strong dependence on the mass of scalar field, the parameter of nonminimal coupling with gravity, and parameters of loop quantum gravity. Additionally, the study reveals potential breaking of conformal invariance in the context of loop quantum black holes for certain parameter values.

EUROPEAN PHYSICAL JOURNAL C (2021)

Article Astronomy & Astrophysics

Estimating the Parameters of Extended Gravity Theories with the Schwarzschild Precession of S2 Star

Dusko Borka et al.

Summary: The study evaluates parameters of Extended Gravity theories by estimating the orbital precession of the S2 star, showing that some Extended Gravity models can produce prograde orbital precession similar to General Relativity. This method proves to be a useful tool to assess gravitational potential parameters at the Galactic Center.

UNIVERSE (2021)

Article Physics, Multidisciplinary

Testing Loop Quantum Gravity from Observational Consequences of Nonsingular Rotating Black Holes

Suddhasattwa Brahma et al.

Summary: This study constructs a rotating spacetime solution in loop quantum gravity using the revised Newman-Janis algorithm based on a nonrotating seed metric, showing the features of rotating black holes in different parameter regions and demonstrating how observational constraints can be applied to fundamental parameters of LQG. The causal structure of the solution is shown to depend crucially on the spacelike transition surface of the nonrotating seed metric, capturing universal features of an effective rotating, nonsingular black hole in LQG.

PHYSICAL REVIEW LETTERS (2021)

Article

Testing the Galactic Centre potential with S-stars

Alexander F Zakharov

Monthly Notices of the Royal Astronomical Society: Letters (2021)

Article Astronomy & Astrophysics

Modeling the Sgr A* Black Hole Immersed in a Dark Matter Spike

Sourabh Nampalliwar et al.

Summary: This paper investigates the impact of a dark matter spike on the vicinity of the black hole Sgr A* in the center of the Milky Way. The study examines the influence of dark matter density on the shadow radius and image of the black hole, concluding that the effect is weak for realistic densities but may become significant at higher densities near the black hole. However, simulations with radio interferometry, similar to an EHT array, suggest that detecting this effect in the near future is unlikely.

ASTROPHYSICAL JOURNAL (2021)

Article Astronomy & Astrophysics

S-star dynamics through a Yukawa-like gravitational potential

Anna D'Addio

Summary: By analyzing the data of S-stars orbit, we used a fully relativistic approach to constrain two couplings of a Yukawa-like gravitational potential. The results show that there is no significant departure from General Relativity, even with the simultaneous analysis of more stars.

PHYSICS OF THE DARK UNIVERSE (2021)

Article Astronomy & Astrophysics

f (R) gravity after the detection of the orbital precession of the S2 star around the Galactic Center massive black hole

Ivan De Martino et al.

Summary: The GRAVITY Collaboration made a significant detection of the orbital precession of the S2 star around the Galactic Center supermassive black hole, confirming the validity of general relativity and not revealing any deviations from it. The parameter fSP was found to be consistent with general relativity at the 1 sigma level, but it may also potentially indicate effects of modified theories of gravity.

PHYSICAL REVIEW D (2021)

Article Astronomy & Astrophysics

Extended geometry of Gambini-Olmedo-Pullin polymer black hole and its quasinormal spectrum

Yu-Chen Liu et al.

Summary: This paper systematically studies a model of spherically symmetric polymer black holes proposed by Gambini, Olmedo, and Pullin. The quantum black hole's geometric structure is similar to a wormhole, violating energy conditions at the throat and horizons. Quasinormal modes demonstrate deviations from classical cases due to quantum effects.

PHYSICAL REVIEW D (2021)

Article Astronomy & Astrophysics

Scalar perturbations and stability of a loop quantum corrected Kruskal black hole

Ramin G. Daghigh et al.

Summary: The study investigates the massless scalar field perturbations of a regular black hole model proposed by Ashtekar et al. based on loop quantum gravity, finding that the model is stable against such perturbations. In comparison to the Schwarzschild black hole, this new black hole model oscillates with higher frequency and less damping, exhibiting a qualitative difference in the power-law tail of the ringdown waveform. This suggests that quantum corrections impact the behavior of waves at large distances from the black hole.

PHYSICAL REVIEW D (2021)

Article Astronomy & Astrophysics

Stellar rotation as a new observable to test general relativity in the Galactic Center

Yun Fang et al.

Summary: S stars in the Galactic Center are ideal test objects for studying general relativistic effects, and while previous research has focused on testing their orbital motion around a supermassive black hole, this study explores using their rotation to test de Sitter precession. Numerical simulations suggest that the recently discovered S4714 and S62 may be best suited for such a test, as their rotation could reveal changes in absorption lines in stellar spectra.

PHYSICAL REVIEW D (2021)

Article Astronomy & Astrophysics

Testing the black hole no-hair theorem with Galactic Center stellar orbits

Hong Qi et al.

Summary: Theoretical studies suggest that measurements of stellar or pulsar orbits near the Galactic Center can constrain the properties of the black hole and the theory of gravity. By using a Markov chain Monte Carlo and developing an analytic model, it is found that existing astrometric measurements cannot constrain the spin of the Galactic Center black hole, but future experiments may enable the measurement of the black hole spin.

PHYSICAL REVIEW D (2021)

Article Astronomy & Astrophysics

Black Hole Evaporation: A Perspective from Loop Quantum Gravity

Abhay Ashtekar

UNIVERSE (2020)

Article Astronomy & Astrophysics

A consistent model of non-singular Schwarzschild black hole in loop quantum gravity and its quasinormal modes

Mariam Bouhmadi-Lopez et al.

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (2020)

Article Astronomy & Astrophysics

Observational tests of the self-dual spacetime in loop quantum gravity

Tao Zhu et al.

PHYSICAL REVIEW D (2020)

Article Astronomy & Astrophysics

Properties of the spherically symmetric polymer black holes

Wen-Cong Gan et al.

PHYSICAL REVIEW D (2020)

Article Astronomy & Astrophysics

Polar gravitational perturbations and quasinormal modes of a loop quantum gravity black hole

M. B. Cruz et al.

PHYSICAL REVIEW D (2020)

Article Astronomy & Astrophysics

Perspectives on the dynamics in a loop quantum gravity effective description of black hole interiors

Mehdi Assanioussi et al.

PHYSICAL REVIEW D (2020)

Article Astronomy & Astrophysics

Shadow and quasinormal modes of a rotating loop quantum black hole

Cheng Liu et al.

PHYSICAL REVIEW D (2020)

Article Physics, Particles & Fields

Gravitational axial perturbations and quasinormal modes of loop quantum black holes

M. B. Cruz et al.

EUROPEAN PHYSICAL JOURNAL C (2019)

Article Astronomy & Astrophysics

A geometric distance measurement to the Galactic center black hole with 0.3% uncertainty

R. Abuter et al.

ASTRONOMY & ASTROPHYSICS (2019)

Article Astronomy & Astrophysics

Quantum fields in the background spacetime of a polymeric loop black hole

Flora Moulin et al.

CLASSICAL AND QUANTUM GRAVITY (2019)

Article Astronomy & Astrophysics

Black hole hair from scalar dark matter

Lam Hui et al.

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (2019)

Article Astronomy & Astrophysics

Quasinormal modes of black holes in a toy-model for cumulative quantum gravity

Aurelien Barrau et al.

PHYSICS LETTERS B (2019)

Article Astronomy & Astrophysics

Searching for Quantum Black Hole Structure with the Event Horizon Telescope

Steven B. Giddings

UNIVERSE (2019)

Article Astronomy & Astrophysics

An Overview of Quasinormal Modes in Modified and Extended Gravity

Flora Moulin et al.

UNIVERSE (2019)

Article Astronomy & Astrophysics

Quantum gravity predictions for black hole interior geometry

Emanuele Alesci et al.

PHYSICS LETTERS B (2019)

Article Physics, Multidisciplinary

Quantum Transfiguration of Kruskal Black Holes

Abhay Ashtekar et al.

PHYSICAL REVIEW LETTERS (2018)

Article Astronomy & Astrophysics

Event Horizon Telescope observations as probes for quantum structure of astrophysical black holes

Steven B. Giddings et al.

PHYSICAL REVIEW D (2018)

Article Astronomy & Astrophysics

Effective line elements and black-hole models in canonical loop quantum gravity

Martin Bojowald et al.

PHYSICAL REVIEW D (2018)

Article Physics, Multidisciplinary

Testing General Relativity with Stellar Orbits around the Supermassive Black Hole in Our Galactic Center

A. Hees et al.

PHYSICAL REVIEW LETTERS (2017)

Review Physics, Multidisciplinary

Black holes in loop quantum gravity

Alejandro Perez

REPORTS ON PROGRESS IN PHYSICS (2017)

Editorial Material Astronomy & Astrophysics

Astronomical tests for quantum black hole structure

Steven B. Giddings

NATURE ASTRONOMY (2017)

Article Astronomy & Astrophysics

An Update on Monitoring Stellar Orbits in the Galactic Center

S. Gillessen et al.

ASTROPHYSICAL JOURNAL (2017)

Article Astronomy & Astrophysics

Sgr A* and general relativity

Tim Johannsen

CLASSICAL AND QUANTUM GRAVITY (2016)

Article Astronomy & Astrophysics

Quantum gravity effects around Sagittarius A*a

Hal M. Haggard et al.

INTERNATIONAL JOURNAL OF MODERN PHYSICS D (2016)

Article Astronomy & Astrophysics

A QUANTITATIVE TEST OF THE NO-HAIR THEOREM WITH Sgr A* USING STARS, PULSARS, AND THE EVENT HORIZON TELESCOPE

Dimitrios Psaltis et al.

ASTROPHYSICAL JOURNAL (2016)

Article Astronomy & Astrophysics

A note on black hole entropy in loop quantum gravity

S. Carlip

CLASSICAL AND QUANTUM GRAVITY (2015)

Article Astronomy & Astrophysics

Loop quantum cosmology: from pre-inflationary dynamics to observations

Abhay Ashtekar et al.

CLASSICAL AND QUANTUM GRAVITY (2015)

Article Astronomy & Astrophysics

Pinpointing the near-infrared location of Sgr A* by correcting optical distortion in the NACO imager

P. M. Plewa et al.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2015)

Article Astronomy & Astrophysics

Gravitational lensing by self-dual black holes in loop quantum gravity

Satyabrata Sahu et al.

PHYSICAL REVIEW D (2015)

Article Physics, Particles & Fields

Analytic continuation of black hole entropy in Loop Quantum Gravity

Ben Achour Jibril et al.

JOURNAL OF HIGH ENERGY PHYSICS (2015)

Article Astronomy & Astrophysics

Loop quantum cosmology with complex Ashtekar variables

Jibril Ben Achour et al.

CLASSICAL AND QUANTUM GRAVITY (2015)

Article Physics, Multidisciplinary

Black-hole entropy from complex Ashtekar variables

E. Frodden et al.

Article Astronomy & Astrophysics

Particle creation by loop black holes

Emanuele Alesci et al.

GENERAL RELATIVITY AND GRAVITATION (2014)

Article Astronomy & Astrophysics

Fast radio bursts and white hole signals

Aurelien Barrau et al.

PHYSICAL REVIEW D (2014)

Article Astronomy & Astrophysics

emcee: The MCMC Hammer

Daniel Foreman-Mackey et al.

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC (2013)

Article Physics, Mathematical

Semiclassical Loop Quantum Gravity and Black Hole Thermodynamics

Arundhati Dasgupta

SYMMETRY INTEGRABILITY AND GEOMETRY-METHODS AND APPLICATIONS (2013)

Article Physics, Multidisciplinary

Complex frequencies of a massless scalar field in loop quantum black hole spacetime

Chen Ju-Hua et al.

CHINESE PHYSICS B (2011)

Review Astronomy & Astrophysics

Loop quantum cosmology: a status report

Abhay Ashtekar et al.

CLASSICAL AND QUANTUM GRAVITY (2011)

Article Education, Scientific Disciplines

Six easy roads to the Planck scale

Ronald J. Adler

AMERICAN JOURNAL OF PHYSICS (2010)

Article Physics, Multidisciplinary

Semiclassical Loop Quantum Black Hole

Leonardo Modesto

INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS (2010)

Article Physics, Multidisciplinary

The Galactic Center massive black hole and nuclear star cluster

Reinhard Genzel et al.

REVIEWS OF MODERN PHYSICS (2010)

Article Astronomy & Astrophysics

Self-dual black holes in loop quantum gravity: Theory and phenomenology

Leonardo Modesto et al.

PHYSICAL REVIEW D (2009)

Article Astronomy & Astrophysics

Barbero-Immirzi parameter as a scalar field: K-inflation from loop quantum gravity?

Victor Taveras et al.

PHYSICAL REVIEW D (2008)

Article Astronomy & Astrophysics

The position of Sagittarius A*. III. Motion of the stellar cusp

M. J. Reid et al.

ASTROPHYSICAL JOURNAL (2007)

Article Astronomy & Astrophysics

Loop quantum black hole

Leonardo Modesto

CLASSICAL AND QUANTUM GRAVITY (2006)

Article Astronomy & Astrophysics

Quantum geometry and the Schwarzschild singularity

A Ashtekar et al.

CLASSICAL AND QUANTUM GRAVITY (2006)

Article Astronomy & Astrophysics

Black-hole entropy in loop quantum gravity

KA Meissner

CLASSICAL AND QUANTUM GRAVITY (2004)

Review Astronomy & Astrophysics

Selected topics in Planck-scale physics

YJ Ng

MODERN PHYSICS LETTERS A (2003)

Article Physics, Multidisciplinary

Inflationary spacetimes are incomplete in past directions

A Borde et al.

PHYSICAL REVIEW LETTERS (2003)