Shadow of quantum extended Kruskal black hole and its super-radiance property

Devi, Saraswati; S, Abhinove Nagarajan; Chakrabarti, Sayan; Majhi, Bibhas Ranjan

doi:10.1016/j.dark.2023.101173

Cited by 12 publications

(5 citation statements)

References 63 publications

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“…Then we considered the effect of quantum parameter of metric on the shadow of the BH. Our result (37) shows that the size of shadow shrinks slightly which is in agreement with a recent work on the subject [48]. Moreover, we calculated the escape angle of photons emanating from a fixed source.…”

Section: Discussionsupporting

confidence: 92%

“…According to (37), the size of the AOS BH shadow decreases in comparison to its classical counterpart. This result is in agreement with the recent work [48] in which the authors numerically studied the shadow of rotating and non-rotating AOS BHs. .Let us study this in more detail.…”

Section: Null Circular Orbit and The Shadowsupporting

confidence: 93%

“…We find that, as expected in the case of macroscopic BHs, the quantum effects on the BH shadow can be neglected. Moreover, our result is in agreement with the numerical results of [48].…”

Section: Introductionsupporting

confidence: 91%

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Geodetic precession and shadow of quantum extended black holes

Saadati,

Shojai

2023

Class. Quantum Grav.

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We study the circular motion of massive and massless particles in a recently proposed quantum-corrected Schwarzschild black hole in loop quantum gravity. This solution is supposed to introduce small but non-zero quantum corrections in the low curvature limit. In this paper, we confine our attention to the shadow of the black hole and the geodetic precession (GP) of a freely falling gyroscope in a circular orbit. Despite the mathematical complexity of the metric, our results are exact and show that the black hole shadow decreases slightly in this solution while the quantum corrections introduce a non-trivial term in the GP frequency of the gyroscope.

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Section: Discussionsupporting

confidence: 92%

Section: Null Circular Orbit and The Shadowsupporting

confidence: 93%

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Geodetic precession and shadow of quantum extended black holes

Saadati,

Shojai

2023

Class. Quantum Grav.

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“…Bose-Einstein condensation (BEC) is a physical phenomenon which has permeated many areas of physics, from condensed matter to cosmology [1]. In particular, some superconductivity theories [2,3] consider Cooper pairs as composite bosons, an assumption that becomes more precise the smaller the correlation length of the pairs is, like in cuprates.…”

Section: Introductionmentioning

confidence: 99%

Two-step BEC coming from a temperature dependent energy gap

Acevedo,

Atala

2024

Preprint

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We report the effects on the thermodynamic properties of a 3D Bose gas caused by a temperature dependent energy gap ∆ (T) at the lower edge of the energy spectrum of the particles constituting the Bose gas which behaves like an ideal Bose gas when the gap is removed. Explicit formulae are given for the critical temperature, the condensate fraction, the internal energy and the isochoric specific heat, which are calculated for three different gaps that abruptly go to zero at temperature TB, as well as for the damped counterparts whose drop to zero we have smoothed. In particular, for the undamped BCS (Bardeen, Cooper and Schrieffer) gap it is observed that the Bose-Einstein condensation (BEC) critical temperature Tc is equal to that of the ideal Bose gas T0, for all TB ≤ T0; surprisingly, the condensate fraction presents two different filling rates of the ground state at Tc = T0 and at TB < T0 while the specific heat shows a finite jump at Tc as well as a divergence at TB. Three-dimensional infinite Bose gas results are recovered when the temperature independent gap is either a constant or equal to zero. PACS numbers: 03.75.Fi; 05.30.Jp; 67.40.Kh

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“…Many authors have considered the fingerprints of alternative theories of gravity through the shadow , while others explored the effects of the astrophysical environment into the shadow [76][77][78][79][80][81]. Through the black hole shadow, it also can penetrate through its quantum nature [82][83][84][85][86][87][88][89].…”

Section: Introductionmentioning

confidence: 99%

Constraints on charged symmergent black hole from shadow and lensing

Puliçe,

Pantig,

Övgün

et al. 2023

Class. Quantum Grav.

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In this paper, we report on exact charged black hole solutions in symmergent gravity with Maxwell field. Symmergent gravity induces the gravitational constant $G$, quadratic curvature coefficient $c_{\rm O}$, and the vacuum energy $V_{\rm O}$ from the flat spacetime matter loops. In the limit in which all fields are degenerate in mass, the vacuum energy $V_{\rm O}$ can be expressed in terms of $G$ and $c_{\rm O}$. We parametrize deviation from this limit by a parameter ${\hat \alpha}$ such that the black hole spacetime is dS for ${\hat \alpha} < 1$ and AdS for ${\hat \alpha} > 1$. In our analysis, we study horizon formation, shadow cast and gravitational lensing as functions of the black hole charge, and find that there is an upper bound on the charge. At relatively low values of charge, applicable to astronomical black holes, we determine constraints on $c_{\rm O}$ and ${\hat \alpha}$ using the EHT data from Sgr. A* and M87*. We apply these constraints to reveal how the shadow radius behaves as the observer distance $r_O$ varies. It is revealed that black hole charge directly influences the shadow silhouette, but the symmergent parameters have a tenuous effect. We also explored the weak field regime by using the Gauss-Bonnet theorem to study the weak deflection angle caused by the M87* black hole. We have found that impact parameters comparable to the actual distance $D = 16.8$ Mpc show the potential detectability of such an angle through advanced astronomical telescopes. Overall, our results provide new insights into the behavior of charged black holes in the context of symmergent gravity and offer a new way to test these theories against observational data.

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Shadow of quantum extended Kruskal black hole and its super-radiance property

Cited by 12 publications

References 63 publications

Geodetic precession and shadow of quantum extended black holes

Geodetic precession and shadow of quantum extended black holes

Two-step BEC coming from a temperature dependent energy gap

Constraints on charged symmergent black hole from shadow and lensing

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