Periodic orbits and their gravitational wave radiations in a polymer black hole in loop quantum gravity

Ze-Yi, Tu,; Zhu, Tao; Wang, Anzhong

doi:10.1103/physrevd.108.024035

Cited by 13 publications

(2 citation statements)

References 58 publications

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“…A key question has emerged regarding whether LQG effects in the loop quantum spacetime can produce any observational signatures for current and future experiments, allowing us to test the effect of LQG. This has spurred a surge of studies over the past decades, drawing from various experiments and observations [e.g., 12,[24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39]. In [36], LQG effects on the shadow of the rotating black hole are discussed in detail.…”

Section: Introductionmentioning

confidence: 99%

Shadows of loop quantum black holes: semi-analytical simulations of loop quantum gravity effects on Sagittarius A* and M87*

Jiang,

Liu,

Dihingia

et al. 2024

J. Cosmol. Astropart. Phys.

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In this study, we delve into the observational implications of rotating Loop Quantum Black Holes (LQBHs) within an astrophysical framework. We employ semi-analytical General Relativistic Radiative Transfer (GRRT) computations to study the emission from the accretion flow around LQBHs. Our findings indicate that the increase of Loop Quantum Gravity (LQG) effects results in an enlargement of the rings from LQBHs, thereby causing a more circular polarization pattern in the shadow images. We make comparisons with the Event Horizon Telescope (EHT) observations of Sgr A* and M87*, which enable us to determine an upper limit for the polymetric function P in LQG. The upper limit for Sgr A* is 0.2, while for M87* it is 0.07. Both black holes exhibit a preference for a relatively high spin (a ≳ 0.5 for Sgr A* and 0.5 ≲ a ≲ 0.7 for M87*). The constraints for Sgr A* are based on black hole spin and ring diameter, whereas for M87*, the constraints are further tightened by the polarimetric pattern. In essence, our simulations provide observational constraints on the effect of LQG in supermassive black holes (SMBH), providing the most consistent comparison with observation.

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Section: Introductionmentioning

confidence: 99%

Shadows of loop quantum black holes: semi-analytical simulations of loop quantum gravity effects on Sagittarius A* and M87*

Jiang,

Liu,

Dihingia

et al. 2024

J. Cosmol. Astropart. Phys.

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“…One may naturally wonder if the LQG effects on the self-dual spacetime can produce any observable spatial or temporal features that can be verified or constrained by present or future experiments and observations. This question has motivated a multitude of studies in the past decades from various perspectives [19,[30][31][32][33][34][35][36][37][38][39][40][41][42][43][44]. In particular, in [41], the LQG effects on the shadow of a spinning black hole were examined in detail, and their observational consequences were compared with the latest Event Horizon Telescope (EHT) observation of the supermassive black hole M87*.…”

Section: Introductionmentioning

confidence: 99%

Constraints on the rotating self-dual black hole with quasi-periodic oscillations

Liu,

Siew,

Zhu

et al. 2023

J. Cosmol. Astropart. Phys.

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An impressive feature of loop quantum gravity (LQG) is that it can elegantly resolve both the big bang and black hole singularities. By using the Newman-Janis algorithm, a regular and effective rotating self-dual black hole (SDBH) metric could be constructed, which alters the Kerr geometry with a polymeric function P from the quantum effects of LQG geometry. In this paper, we investigate its impact on the frequency characteristics of the X-ray quasi-periodic oscillations (QPOs) from 5 X-ray binaries and contrast it with the existing results of the orbital, periastron precession and nodal precession frequencies within the relativistic precession model. We apply a Monte Carlo Markov Chain (MCMC) simulation to examine the possible LQG effects on the X-ray QPOs. We found that the best constraint result for the rotating self-dual geometry from LQG came from the QPOs of X-ray binary GRO J1655-40, which establish an upper bound on the polymeric function P less than 6.15 × 10-3 at 95% confidence level. This bound leads to a restriction on the polymeric parameter δ of LQG to be 0.66.

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Stability of thin-shell wormholes via polymer black hole in loop quantum gravity

Javed,

Waseem,

Fatima

et al. 2024

Physics of the Dark Universe

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Periodic orbits and their gravitational wave radiations in a polymer black hole in loop quantum gravity

Cited by 13 publications

References 58 publications

Shadows of loop quantum black holes: semi-analytical simulations of loop quantum gravity effects on Sagittarius A* and M87*

Shadows of loop quantum black holes: semi-analytical simulations of loop quantum gravity effects on Sagittarius A* and M87*

Constraints on the rotating self-dual black hole with quasi-periodic oscillations

Stability of thin-shell wormholes via polymer black hole in loop quantum gravity

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