Holographic Entanglement Entropy and Van der Waals transitions in Einstein-Maxwell-Dilaton theory

Shou-Long Li and Hao Wei

School of Physics, Beijing Institute of Technology, Beijing 100081, China

Department of Physics, Tianjin University, Tianjin 300350, China

ABSTRACT

According to the gauge/gravity duality, the Van der Waals transition of charged AdS black holes in extended phase space is conjectured to be dual to a renormalization group flow on the space of field theories. So exploring Van der Waals transition is valuable potentially for studying holographic properties of charged black hole thermodynamics. There are different transition behaviors for charged dilatonic AdS black holes in Einstein-Maxwell-Dilaton (EMD) theory with string-inspired potential with different dilaton coupling constant in diverse dimensions. In this work, we study the extended thermodynamics of a special class of the charged dilatonic AdS black holes, which, in the extremal limit, have near-horizon geometry conformal to AdS. We find for these black holes both the pressure-volume transition in fixing charge ensemble and the inverse temperature-entropy transition in fixing pressure ensemble have the standard Van der Waals behaviors. We also find the holographic entanglement entropy undergoes the same transition behaviors for the same critical temperature in fixing thermodynamic pressure ensemble.

sllee_phys@bit.edu.cn haowei@bit.edu.cn

###### Contents

## 1 Introduction

According to gauge/gravity duality, also known as anti-de Sitter/conformal field theory (AdS/CFT) correspondence [1, 2, 3], there are deep connections between anti-de Sitter (AdS) black holes and strongly coupled large field theory. The dual CFT of Hawking-Page phase transition [4] of Schwarzchild AdS black hole was interpreted clearly as a confinement/deconfinment phase transition by Witten [5]. However, the exact dual field interpretation of Van der Waals transition of Reissner-Nordström (RN) AdS black hole is still unknown. Actually, the phase transitions of charged AdS black holes have been studied in many literatures, e.g. [6, 8, 7, 9]. Recently, the idea of treating cosmological constant and its conjugate quantity as thermodynamic pressure and thermodynamic volume in first law of black hole thermodynamics were studied in Refs. [10, 11, 12] and then the phase transition in extended phase space was considered in Ref. [13]. There appear several new interesting transition behaviors, such as -line transition [14], reentrant phase transitions [15, 16, 17, 18, 19], triple points [20, 17, 21], special isolated critical point [22], transition at negative pressure [23] and so on [24, 25] in extended phase space. We refer to e.g. [26, 27] and references therein for more details of this subject.

Recently, a conjecture [28] was proposed that the Van der Waals transition in extended phase space is related to renormalization group (RG) flow which is an holographic explanation of extended thermodynamics of black hole. Some other related efforts, e.g. [25, 29, 30, 31, 36, 32, 37, 38, 39, 33, 40, 41, 42, 34, 43, 44, 35, 45], have been made in such interpretation. So as the first step to study the holographic properties of thermodynamics of charged AdS black holes, exploring the Van der Waals behaviors in corresponding gravities is worth to do. Actually, the standard Van der Waals behavior does not always exist in charged AdS black hole systems. For examples, according to recent works [25, 23], there are different phase transition behaviors in charged dilatonic AdS black holes in a class of Einstein-Maxwell-Dilaton (EMD) theory, which can be embedded in gauged supergravites, for different dilaton coupling constant , also known as , in diverse dimensions.

The extremal RN black holes in supergravity can be viewed as one of the bound states of the basic building blocks with zero binding energy [46, 47]. On the other hand, while EM theories can be embedded in string and M-theory in four and five dimensions only, charged dilatonic AdS black holes in gauged supergravities [48, 49, 50, 51] can be embedded in higher dimensions. The considered EMD theory with string-inspired potential, as a concrete gravitational theory, can be generalized to arbitrary dimensions [52].

From Refs. [25, 23], we find only four dimensional and five dimensional cases have the traditional Van der Waals behavior which is same with RN-AdS black hole in the frame of gauge supergravity. One may ask whether the Van der Waals behaviors of and cases are coincidences. Is there some deep reason for the existence of Van der Waals behaviors in the four and five dimensions? Can we obtain the same behaviors in higher than five dimension in the EMD theory with supergravity properties? We find charged dilatonic AdS black holes in and cases share a common point that having near-horizon geometry conformal to AdS in the extreme limit [52, 53], while extremal RN-AdS black holes have near-horizon geometry AdS [54]. So we conjecture the similar near-horizon geometry maybe the reason for the same behavior of phase transition. In order to check it, we generalize previous transitions from gauged supergravity to EMD theory with supregravity properties in general dimensions. For this special class of black holes with near-horizon geometry conformal to AdS, the phase transition in both fixing charge and thermodynamic pressure ensembles are indeed standard Van der Waals behaviors.

On the other hand, holographic entanglement entropy (HEE) which enjoys much attention since proposed by Ryu and Takayanagi [55, 56] undergoes also standard Van der Waals behaviors in RN AdS black holes instead of Bekenstein-Hawking entropy [57]. The HEE transitions were also studied in many other modified gravities, i.e. [58, 59, 60, 68, 67, 66, 70, 71, 65, 64, 63, 69, 62, 74, 73, 61, 72, 75]. And the Van der Waals transition behavior in charged dilatonic AdS black holes in four dimensional gauged supergravity also exists in case only [25]. So it is natural to check whether Van der Waals transition behavior exists in the special class charged dilatonic AdS black holes with conformal AdS near-horizon geometry in general dimensions.

The paper is organized as follow. In section 2, we review the thermodynamics of dilatonic charged AdS black holes in EMD theory with string-inspired potential and study the near-horizon geometry properties of the special class black holes. In section 3, we study the extended thermodynamics of the special class black holes, especially thermodynamic pressure verse volume transition in fixing charge ensemble and inverse temperature verse Bekenstein-Hawking entropy in fixing pressure ensemble. We find the transitions have standard Van der Waals behaviors in both cases. In section 4, we review the HEE and calculate it numerically. Then we study the inverse temperature verse HEE transition in fixing pressure ensemble. We find the standard Van der Waals behaviors still exist. We conclude in section 4.

## 2 Charged dilatonic AdS black holes with conformal AdS near-horizon geometry

The Lagrangian of general EMD theory consisting gravity, single Maxwell field and a dilaton field in dimensions is given by

(2.1) |

where , , is scalar potential inspired by gauged supergravities. For later purpose, it is convenient to reparameterize the dilaton coupling constant by [52]

(2.2) |

The reality condition of requires that the constant must satisfy

(2.3) |

The charged dilatonic AdS black holes with can be viewed as dilatonic AdS black hole with equal charges [46, 47]. So the value of should be positive integers required by supergravity. However, as a concrete gravitational theory, any value of satisfying Eq. (2.3) is allowed. When , i.e., , the dilaton decouples and the theory reduces to EM theory. Although the Lagrangian can be made real by letting when , we shall not consider such situation at all. The potential can be expressed in terms of a super potential [52],

(2.4) |

where and is gauge coupling constant (there should be no confusion between the gauge coupling constant and the determinant of the metric).

The static AdS black hole solutions for Lagrangian (2.1) with scalar potential (2.4) and constraints (2.2) are given by [52]

(2.5) | ||||

(2.6) | ||||

(2.7) |

where parameters and characterise mass and electric charge, and represents the unit -sphere, -torus or hyperbolic -space. The topological black holes can be easily obtained by some appropriate scaling. In our work, we only consider spherical black holes for simplification.

The event horizon of black hole is determined by the largest (real) root of . The thermodynamic quantities are given by [52, 76]

(2.8) | ||||

(2.9) | ||||

(2.10) |

where indicates the Gamma function, and denote mass, Hawking temperature, entropy, electric charge and electric potential respectively.

The extremal black holes can be obtained by requiring , but with . The extreme limit is also called zero temperature limit. The extremal black holes in EMD theory with two Maxwell field [52] always exist for any dilaton coupling constant because the theory reduces to EM theory when the two Maxwell field are equal. However, the existence of extremal black hole in EMD theory with single Maxwell field (2.1) depends on the value of . For general , becomes

(2.11) |

According to Eq. (2.9), the temperature is given by

(2.12) |

It is easy to see that the last two terms in the bracket in above equation are always greater than zero. There is a special value

(2.13) |

For , is always greater than 0. For , there must exist extremal black holes for proper parameters. If we choose , there is also a extreme limit as . The special dilaton coupling constant can be viewed as a bound threshold for existence of extremal black hole. We plot the relations between and for both cases in Fig. 1.

In this case, the lowest order of , , in cancels for and becomes a non-vanishing constant as . The is then a null horizon where the horizon and curvature singularity coincide. In this case, near the null horizon, , the solution (2.5) becomes

(2.14) | |||||

where

(2.15) |

The near-horizon geometry becomes conformal AdS. To be specific, the metric becomes AdS around . So charged dilatonic AdS black holes with have the similar near-horizon structure with the RN-AdS black holes with in EMD theory. In the range of , the black hole must have the similar behaviors. So we can say the Van der Waals behaviors must exist in the range at least in zero temperature limit. However, at finite temperature, the phase transition behaviors is still unclear. We will study the behaviors in next section.

## 3 Extended thermodynamics

In this section we study the extended thermodynamics of charged dilatonic AdS black holes in EMD theory with . The gauge coupling constant (cosmological constant) can be interpreted as thermodynamical pressure in the extended phase space,

(3.1) |

The corresponding thermodynamic volume is given by

(3.2) |

where . The thermodynamic volume satisfies the “Reverse Isoperimetric Inequality” conjecture [12]. Although the conjecture is not proven, it has been checked in most black holes and follows from null-energy condition [76]. In order to study the phase transitions, it is convenient to introduce a special volume by analysing the dimensional scaling. By assuming the shape of black hole is regular sphere, the special volume can be viewed as the effective radius of black hole,

(3.3) |

Together with other thermodynamical quantities (2.8)-(2.10), we have the following first law and Smarr relation

(3.4) | |||||

(3.5) |

We present the values of special dilaton coupling constant in diverse dimensions in Table 1.

4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | |||

3 | 2 | 5/3 | 3/2 | 7/5 | 4/3 | 9/7 | 5/4 | 1 | ||

The four and five dimensional cases coincide with gauged supergravities. The theory with case in infinite dimension (large limit) is coincident with gauged Kaluza-Klein theory. The phase transitions of RN-AdS black holes in the extended phase space undergo the Van der Waals behaviors [13]. The similar transition behaviors of charged dilatonic AdS black holes in gauged supergravities have also been studied in Ref. [25, 23]. There are only two cases and existing standard Van der Waals behavior. Due to the both cases are subset of and share the same near-horizon geometry. So we study the phase transition in EMD theory with supergravity property with special dilaton coupling constant in diverse dimensions. On the other hand, inverse temperature verse Bekenstein-Hawking entropy and HEE transitions of RN-AdS black holes [57] and STU black hole with three equal charges [25] also have the Van der Waals behaviors. So we also want to study whether the similar behaviors exist in EMD theory with the special dilaton coupling constant . In this section, we study the and phase transitions of the charged dilatonic AdS black holes in extended phase space. We fix the electric charge and thermodynamical pressure respectively, and do not treat them as thermodynamical variable in each case. The first law reduces to

(3.6) |

for each case.

### 3.1 criticality

Firstly, we study the transition by treating charge as constant. The temperature, thermodynamical pressure and special volume can be written as

(3.7) | ||||

(3.8) | ||||

(3.9) |

It is hard to obtain the exact EoS because the temperature, thermodynamical pressure and volume are coupled with each other. However, we can study the phase transition by numeric method. To be specific, we set . The diagram is given by Fig. 2.

We illustrate only dimensional cases to show the transition behaviors. The criticality in four and five dimensional cases have been analysed in Refs. [25, 23]. However, as the special cases in our anlysis, we present them here for comparison. We also explore the transition in higher dimensions and find the behaviors are same. From the diagram, we find the phase transitions in diverse dimensions undergo standard Van der Waals behaviors. As the volume decreases to zero, the pressure increase to infinity. As the volume goes to infinity, the pressure goes to zero. The corresponding critical point can be obtained numerically by

(3.10) |

The critical points are given in Table 2.

4 | 0.179 | |||

5 | 0.308 | |||

6 | 0.435 | |||

7 | 0.561 | |||

We also study the phase transition in another perspective by plotting transition fixing thermodynamic pressure. The diagram is given by Fig. 3.

For fixing pressure, the critical points can be also obtained by

(3.11) |

The results are same with Table 2.

After obtaining and diagrams, together with analysis in previous section, we can try to explain the transition behaviors in EMD theory for different gauge coupling constant. The cases dimensions, and in dimension which are coincident with gauge supergravities, the Van der Waals behaviors are absent because there is no extremal black hole in the range of . In these cases, temperature can not go to zero which is different from the standard Van der Waals behaviors in Fig. 3. The cases in six and seven dimensions which are coincident with gauge supergravities, the phase transition behaviors can be viewed as Van der Waals-like behaviors. At high temperature, there are two branches of isotherms which one is same with standard Van der Waals behavior and correspond to positive pressure, and the other one is different and correspond to negative pressure. As the temperature goes to zero, the negative branch disappears because the near-horizon geometries are also conformal AdS in the range of . For cases and which are the special cases of , as the threshold and the low bound of the existence of extremal black hole, have the same behaviors of RN-AdS black holes.

### 3.2 criticality

Now we study the inverse temperature verse Bekenstein-Hawking entropy transition by fixing thermodynamical pressure independent with dimension, i.e. gauge coupling constant . From Ref. [25], transition of STU black hole with three equal charges and RN-AdS black hole have standard Van der Waals behaviors. Now we study the general dilatonic AdS black holes in EMD theory with the special dilaton coupling constant . The temperature, entropy and charge can be written as

(3.13) | ||||

(3.14) | ||||

(3.15) |

It is also hard to obtain the exact EoS for system. We study the phase transition by numeric method used before. To be specific, we set . The diagram is given by Fig. 6.

We also illustrate only dimensions to show behaviors. And we find the higher dimensional cases have the same behaviors. From Fig. 6, we find transition have standard Van der Waals behaviors. As the entropy decreases to zero, the inverse temperature increase to infinity. As the entropy goes to infinity, the inverse temperature goes to zero. The corresponding critical point can be obtained by

(3.16) |

The critical points are given in Table 3

4 | 0.754 | |||

5 | 0.307 | |||

6 | 0.190 | |||

7 | 0.137 | |||

We can also obtain the corresponding critical exponent characterizing the transition from

(3.17) |

which is same with the critical exponent in fixing charge ensemble by numerical method.

## 4 Hee

After studying the extended thermodynamics of charged dilatonic AdS black hole systems with near-horizon geometry conformal to AdS in the bulk view, we find both and transitions have the standard Van der Waals behaviors. Now we consider whether HEE undergoes the same transition behaviors in dual field theory. We start with a review of Ryu-Takayanagi (RT) prescription following e.g. [55, 56] and calculate the HEE of charged dilatonic AdS black holes in general EMD theory with string-inspired potential. Then we plot the transition behaviors.

In the frame of field theory, for a bipartitioning of Hilbert space system, it can be decomposed into two separate tensor factors

(4.1) |

where and are the region within and outside the boundary, entangling surface, . We can construct an operator, reduced density matrix, that acts on by tracing out the other ,

(4.2) |

where the pure quantum state is an element of tensor product Hilbert space. In order to quantifying the amount of entanglement existing in the state by spatial decomposition. We can introduce the von Neumann entropy of reduced density matrix,

(4.3) |

which is also referred as entanglement entropy (EE).

Now we consider the EE in AdS/CFT correspondence frame. Consider a CFT living on boundary whose geometry is described by metric . We can take a region A with entangling surface to lie on some Cauchy slice which is the subset of boundary, so EE can be computed holographically at some constant time slice. We can choose a coordinate systems on the surface via a set of mappings . The induced metric is given by

(4.4) |

Assuming there is a bulk with metric dual to the boundary CFT. According to RT prescription, we need to find a codimension-2 extremal surface satisfying boundary condition in bulk spacetime. The induced metric with extremal area is given by

(4.5) |

So we have

(4.6) |

We should find the one of the extremal surfaces satisfying homology requirement that has the smallest area. The HEE is given by the area of this minimal extreme surface in some sense similar to Bekenstein-Hawking entropy formula,

(4.7) |

where is the dimensional Newton constant and we set in reminder discussion.

Consider a constant time slice and take a spherical region within and outside entangling surface as . We must find the extremal area surface in the bulk, the coordinates . Because the geometry of bulk region is spherical symmetric, so the radial coordinate of the extremal surface in bulk region is only dependent on . We assume the extremal surface running from at to at . Due to the extremal area has the minimal area, we can treat the entropy as an action

(4.8) |

where , and extremize it through Euler-Lagrangian equation with respect to . In order to avoid the divergence, we can integrate to some cutoff . And in order to filter out the thermal entropy, we choose the entangling surface as a small value for . To be specific, we choose , and the cutoff . Since the EE is UV-divergent, it needs to be regularized. The minimal area of AdS vacuum can exactly be given by

(4.9) |

The minimal area of black hole can be calculated numerically. Then we subtract the entropy of extremal surface in AdS vacuum from the black hole. The result is so called renormalized entanglement entropy. The diagram is given by Fig. 7.

From Fig. 7, it can be seen that HEE undergoes the same Van der Waals transition behavior too. The above transition behavior would not change as the choice of the value of since we check it for different values. The critical exponent for the above transition behavior can be calculated numerically by

(4.10) |

which is same with critical exponent of transition.

## 5 Conclusions

As the first step to study the holographic properties of the Van der Waals transition of dilatonic charged AdS black hole, we study the extended thermodynamics in a class of EMD theory with string-inspired potential in general dimensions. By studying both the transition in fixing charge ensemble and transition in fixing pressure ensemble in extended phase space, we find there exist standard Van der Waals transition for a special class black hole with near-horizon geometry conformal to AdS with special dilaton coupling constant which is different from its counterparts with other dilaton coupling constants. Instead of Bekenstein-Hawking entropy, we find HEE also undergoes the same transition behavior.

There are many further consideration of our work. First, based on the conjecture of holographic interpretation of the Van der Waals behaviors [28], it would be interested in study the holographic heat engines of this special class black holes in EMD theory. Second, though we find the black hole with similar near-horizon geometry have same transition behaviors, however, we cannot say the similar near-horizon geometry is the real reason for existence of Van der Waals behaviors definitely. The thermodynamic quantities are coupled with each other and we can not obtain EoS exactly. So it is worth to study the deep reason and check more black holes such as rotating [77], dyonic [78, 79, 80], accelerating [81] black holes and so on, in EMD theory and -deformed gauged KK supergravity. Due to the dilatonic black hole can be lifted in M-branes and D-branes [82], we can also study the extended thermodynamics in M-brane background [83]. Third, due to we obtain the HEE of the special class dilatonic charged AdS black holes, it is also worth to study some other entanglement quantities, such as Wilson loops and correlation functions.

## Acknowledgement

SLL is grateful to Xiao-Xiong Zeng, Hua-Kai Deng and Hong-Da Lyu for kind discussions. He thanks especially H. Lü for many suggestions and proofreading. This work is supported in part by NSFC grants No. 11575022, No. 11175016, No. 11475024, No. 11235003 and Graduate Technological Innovation Project of Beijing Institute of Technology.

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