Based on the work submitted to EPJC

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Presentation transcript:

Thermodynamics and phase transitions of non-linear charged AdS black hole Based on the work submitted to EPJC International Workshop for String theory, Gravitation and Cosmology June 18-20, 2018 Cao H. Nam Yonsei University

Plan of the talk Introduction and motivations The black hole solution Thermodynamics and thermal phase transitions Conclusions

Introduction and motivations

In General Relativity, the black holes have a singularity at the origin surrounded by the event horizon. It is widely believed that the black hole singularity would be removed by a complete theory of quantum gravity. However, up to now there has no a complete understanding of quantum gravity. Thus, the resolution of the black hole singularity at the (semi-) classical level is still open. The black hole without singularity at the origin was first proposed by Bardeen However, Bardeen black hole was reobtained by E. Ayon-Beato and A. Garcia as the gravitational collapse of some magnetic monopole in the non-linear electrodynamics. Later, the non-linear electrodynamics has received considerable attention in studying regular black holes. In recent years, the cosmological constant was considered as the thermodynamic pressure and its conjugate variable is the thermodynamic volume, leading to the extended phase space. Studying thermodynamics of the black holes in the extended phase space have led to new phenomena, such as a Van der Waals-like criticality or multiply reentrant phase transition, etc..

The black hole solution

We consider Einstein gravity coupled to a non-linear electromagnetic field in the AdS spacetime, described by the action where the non-linear electrodynamic term is given as [E. Beato and A. Garcia PRL 98] with to be mass and charge of the system. In the weak field limit The equations of the motion

Instead of solving these equations in terms of , it is easier to solve them in terms of which are derived by means of a Legendre transformation [H. Salazar, etc. , JMP 87] as It can be shown The equations of the motion in terms of

Now let us look at a spherically-symmetric and static black hole with the following ansatz Integrating the equation of the non-linear electrostatic field with we have leading to the electrostatic potential

Integrating Einstein’s equations with one can get At large distances : which means that the black hole looks asymtotically like the RN-AdS black hole At short distances : which means that the black hole solution behaves like a dS geometry.

This implies that the singularity at the origin should be replaced by the dS geometry core which produces a negative pressure and thus prevents a singular end-state of the gravitationally collapsed matter. We can check the curvature scalars to see that they are all finite everywhere.

The black hole mass is related to its horizon radius where red and blue curves correspond to the non-linear charged black hole and the RN- AdS black hole

The reduced extremal horizon radius and the reduced extremal mass of the black hole are determined as, respectively From these, one can get an upper limit for the reduced extremal horizon radius and a lower limit for the reduced extremal mass corresponding to the limit of the zero cosmological constant.

Thermodynamics and thermal phase transitions

The thermodynamic quantities In the following, the black hole charge is kept fixed. The first law of the black hole thermodynamics is defined as The black hole temperature is defined by the surface gravity as

The black hole entropy In the non-linear electrodynamics, the area law is not held but it is approximately recovered in the limit of the large distances Because , the second term is neglected in the limit of the large distances

The thermodynamic volume The heat capacity at constant pressure

The thermal phase transitions Depending on the value of the pressure (or the temperature), there are the first-order, second-order phase transitions, or no the phase transition. Critical point occurs as the isobar (or isotherm) has an inflexion point defined by leading to the equation for the reduced critical event horizon radius and the critical temperature and pressure

Above the critical pressure, the heat capacity is always regular and positive and thus there is no phase transition happening. Below critical pressure, the black hole can undergo a first-order phase transition between a small stable black hole of the radius and a large stable black hole of the radius , where correspond to the local maximum temperature and local minimum temperature . This phase transition is indicated from the intersection of the Gibbs free energy curves (or surfaces) in later. This first-order phase transition is performed via two second-order phase transitions happing at the extremal points because the heat capacity suffers from discontinuities at these points. The point corresponds to the phase transition between a small stable black hole and medium unstable one. The point corresponds to the phase transition between a large stable black hole and medium unstable one

Reduced values of the second-order phase transition points are positive real solutions of the following equation. In limit we have , and thus the phase point should disappear. Whereas, the phase transition point and the corresponding temperature approach the lower limits, , respectively.

In order to obtain more details on the phase transitions of the black hole, we investigate the Gibbs free energy

Let us indicate a van der Waals-like criticality in diagram Let us indicate a van der Waals-like criticality in diagram. First, the equation of state for the black hole

Conclusions: We have derived a regular charged AdS black hole in the non-linear electrodynamics, and investigated its horizon structure. We have specified the first-order, second-order phase transitions, as well as Van der Waals-like criticality. Here, we have not discussed the Hawking-Page phase transition, the phase structure of the black hole, as well as the critical exponents. All of them are given in our paper.