arXiv subjects

Dao-Quan Sun

Publications and source records attributed to Dao-Quan Sun.

6 recordsLinked to original sources

arXiv2024

Holographic supersymmetric Renyi entropies from hyperbolic black holes with scalar hair

We study holographic supersymmetric Renyi entropies from a family of hyperbolic black holes in an Einstein-Maxwell-dilaton (EMD) system under the BPS condition. We calculate the thermodynamic quantities of these hyperbolic black holes. We find a remarkably simple formula of the supersymmetric Renyi entropy that unifies (interpolates) 11 cases embeddable to 10 or 11 dimensional supergravity. It reproduces many known results in the literature, and gives new results with distinctive features. We show that the supersymmetric version of the modular entropy and the capacity of entanglement cannot be mapped to thermal quantities, due to the dependence of the temperature and the chemical potential by the BPS condition. We also calculate the entanglement spectrum. We derive the potential of the EMD system from a $V=0$ solution and obtain two neutral solutions with scalar hair as a byproduct.

hep-th↗

arXiv2024

Extended Holographic Rényi Entropy and hyperbolic black hole with scalar hair

We study the extended thermodynamics of the hyperbolic black hole with scalar hair and obtain the extended holographic Rényi entropy of holographic conformal field theories with scalar hair. We analyze the behaviors of the extended holographic Rényi entropy in terms of holographic calculations. Moreover, we generalize the capacity of entanglement from the extended Rényi entropy and show that it maps to the heat capacity of the thermal conformal field theories on the hyperbolic space.

hep-th↗

arXiv2021

Hawking-Page phase transition, Page curve and islands in black holes

We study the Page curve and the effect of the Hawking-Page phase transition in the Vaidya model of evaporating BTZ black holes, both with and without islands. The phase transition can occur before, at, or after the Page time. When it occurs before the Page time, the information release does not require an island yet still reproduces the Page curve. From the first law of entanglement, the entanglement temperature changes from negative to positive, diverging at the Page time. Thus, the information deposition phase corresponds to a negative temperature, and the release phase to a positive temperature. If the Hawking-Page phase transition takes place, all black hole information is released at once via a quantum jump. We speculate that first-order phase transitions universally affect black hole information, providing an alternative escape mechanism independent of Hawking radiation.

hep-th↗

arXiv2021

Insight into the Microscopic Structure of an AdS Black Hole from the Quantization

We explore the possible microscopic structure of a charged AdS black hole from the quantized viewpoint. A further study shows that some black holes cannot absorb "energy quantum" under certain conditions from the view of quantization. By the quantization of the black hole horizon area, we show the relation between the number of quanta of area and the microscopic degrees of freedom of the black hole. We also interpret a latent heat of thermodynamical phase transition as a transition between the number of quanta of area of large black hole(LBH) and the number of quanta of area of small black hole(SBH) in the charged AdS black hole. Furthermore, the Ruppeiner scalar curvature connecting with the number of quanta of area is also shown.

hep-th↗

arXiv2018

Discussion of a possible corrected black hole entropy

Einstein's equation could be interpreted as the first law of thermodynamic near the spherically symmetric horizon. Through recalling the Einstein gravity with a more general static spherical symmetric metric, we find that the entropy would have a correction in Einstein gravity. By using this method, we investigate the Eddington-inspired Born-Infeld (EiBI) gravity. Without matter field, we can also derive the first law in EiBI gravity. With an electromagnetic field, as the field equations have a more general spherically symmetric solution in EiBI gravity, we find that correction of the entropy could be generalized to EiBI gravity. Furthermore, we point out that the Einstein gravity and EiBI gravity might be equivalent on the event horizon. At last, under EiBI gravity with the electromagnetic field, a specific corrected entropy of black hole is given.

gr-qc↗

arXiv2017

Hawking radiation-quasinormal modes correspondence for large AdS black holes

It is well-known that the non-strictly thermal character of the Hawking radiation spectrum generates a natural correspondence between Hawking radiation and black hole quasinormal modes. This main issue has been analyzed in the framework of Schwarzschild black holes, Kerr black holes and nonextremal Reissner-Nordstrom black holes. In this paper, by introducing the effective temperature, we reanalysis the non-strictly thermal character of large AdS black holes. The results show that the effective mass corresponding to the effective temperature is approximatively the average one in any dimension. And the other effective quantities can also be obtained. Based on the known forms of frequency in quasinormal modes, we reanalysis the asymptotic frequencies of the large AdS black hole in three and five dimensions. Then we get the formulas of the Bekenstein-Hawking entropy and the horizon's area quantization with functions of the quantum "overtone" number $n$.

gr-qc↗