Behavior of quasinormal modes and Van der Waals-like phase transition of charged AdS black holes in massive gravity
In this work, we utilize the quasinormal modes (QNMs) of a massless scalar perturbation to probe the Van der Waals-like small and large black holes (SBH/LBH) phase transition of charged topological Anti-de Sitter (AdS) black holes in four-dimensional massive gravity. We find that the signature of this SBH/LBH phase transition is detected in the isobaric as well as in the isothermal process. This further supports the idea that the QNMs can be an efficient tool to investigate the thermodynamical phase transition.
pacs:04.50.Kd, 04.70.-s, 04.25.D-
Einstein’s general relativity introduces gravitons as massless spin-2 particles (1); (2); (3). However, understanding the quantum behavior of gravity could be related to the possible mass of the graviton. This Einstein theory, modified at large distances in massive gravity provides a possible explanation for the accelerated expansion of the Universe that does not require any dark energy. Actually, the massive gravity and its extensions, such as bimetric gravity, can yield cosmological solutions which do display late-time acceleration in agreement with observations (4); (5); (6); (7). Very recently, the LIGO collaboration reporting the discovery of gravitational wave asserted that (8) “assuming a modified dispersion relation for gravitational waves, our observations constrain the Compton wavelength of the graviton to be , which could be interpreted as a bound on the graviton mass ”. In order to have massive graviton, the first attempt for constructing a massive theory was in the work of Fierz and Pauli (9) which was done in the context of linear theory. Unfortunately this theory possesses so-called van Dam, Veltman and Zakharov discontinuity problem. The resolution to this problem was Vainshtein’s mechanism, which requires the system to be considered in nonlinear framework. As is now well known, it usually brings about Boulware-Deser ghost (10) by adding generic mass terms for the graviton on the nonlinear level. Subsequently, a nonlinear massive gravity theory was proposed by de Rham, Gabadadze and Tolley (dRGT) (11); (12), where the mass terms are added in a specific way to ensure that the corresponding equations of motion are at most second order differential equations so that the Boulware-Deser ghost is eliminated. Later, spherically symmetric black hole solutions were constructed in the dRGT massive gravity (13); (14); (15); (16), including its extension in terms of electric charge (17); (18); (19), black string (20), BTZ like black holes (21); (22) and some other solutions with higher curvature correction terms (23); (24). This program goes beyond solution constructions in the dRGT massive gravity and focuses on the investigation holographic implications (25); (26); (28); (27); (29); (30), discussing the thermodynamical properties (33); (31); (32); (34) and calculating QNMs under massless scalar perturbations for the BTZ like black hole (35).
The thermodynamical phase transition of a black hole is always a hot topic in black hole physics. It may shed light on the understanding of the relation between gravity and thermodynamics. Recently, thermodynamics of AdS black holes has been generalized to the extended phase space where the cosmological constant is treated as the pressure of the black hole (36); (37); (38). A particular emphasis has been put on the study of the black hole phase transitions in AdS spacetime in Ref.(39), which asserted the analogy between the Van der Waals liquid-gas system behavior and the charged AdS black hole. Subsequently a broad range of thermodynamic behaviors have been discovered, including reentrant phase transitions and more general Van der Waals behavior (40); (42); (41); (43); (44); (46); (48); (45); (64); (63); (52); (49); (70); (50); (47); (66); (65); (56); (58); (68); (53); (54); (67); (57); (55); (69); (51); (61); (62); (59); (60). Recently, some investigations od the thermodynamics of AdS black holes in the massive gravity showed generalization to the extended phase space (71); (73); (76); (75); (72); (19); (74), including the higher curvature terms (23); (32); (31).
For a long time, thermodynamical phase transitions of the black hole are supposed to detect by some observational signatures. Considering that QNMs of dynamical perturbations are characteristic issues of black holes (77); (78); (79), it is expected that black hole phase transitions can be reflected in the dynamical perturbations in the surrounding geometries of black holes through frequencies and damping times of the oscillations. Moreover, the QNM frequencies of AdS black holes have direct interpretation in terms of the dual conformal field theory CFT (80); (81); (82); (83); (84); (85). A lot of discussions have been focused on this topic and more and more evidence has been found between thermodynamical phase transitions and dynamical perturbations. See for examples (86); (87); (90); (89); (92); (88); (93); (94); (95); (96); (91). In the extended phase space, we have recovered the deep relation between the dynamical perturbation and the Van der Waals-like SBH/LBH phase transition in the four-dimensional Reissner-Nordstrm-Anti de Sitter (RN-AdS) black holes with spherical horizon (97). Later, matters have been generalized to higher-dimensional RN-AdS black holes (98) , including time-domain profiles (99), and higher-dimensional charged black holes in the presence of Weyl coupling (100).
It is necessary to point out that in four-dimensional dRGT massive gravity, there always exists so-called Van der Waals-like SBH/LBH phase transition for the charged AdS black holes when the horizon topology is spherical , Ricci flat or hyperbolic (71). In particular, this phenomenon rarely occurs, since this Van der Waals-like SBH/LBH phase transition was usually recovered in a variety of spherical horizon black hole backgrounds. Motivated by these results, in this paper we find crucial and well justified to reconsider the charged topological AdS black hole in four-dimensional dRGT massive gravity. We further use the QNM frequencies of a massless scalar perturbation to probe the Van der Waals-like SBH/LBH phase transitions of charged topological black holes , respectively.
This paper is organized as follows. In Sect. II, we will review the Van der Waals-like SBH/LBH phase transition of charged topological AdS black holes in four-dimensional massive gravity. In Sect. III, we will disclose numerically that the phase transition can be reflected by the QNM frequencies of dynamical perturbations. We end the paper with conclusions and discussions in Sect. IV.
Ii Phase transition of charged topological AdS black hole in massive gravity
We start with the action of four-dimensional massive gravity in the presence of a negative cosmological constant (33)
where is a fixed symmetric tensor usually called the reference metric, are constants, is the mass parameter related to the graviton mass, and is the Maxwell field strength defined as with vector potential . Moreover, are symmetric polynomials of the eigenvalues of the matrix
The square root in is understood as the matrix square root, ie., , and the rectangular brackets denote traces .
The action admits a static black hole solution with metric
where the coordinates are labeled and describes the two-dimensional hypersurface with constant scalar curvature . The constant characterizes the geometric property of a hypersurface, which takes values for the flat case, for negative curvature and for positive curvature, respectively. In a four-dimensional situation, we have . Then the solution of charged topological AdS black hole is given by (33)
where equals to . Moreover, the parameters and are related to mass and charge of black hole
Here is the volume of space spanned by coordinates . When , the solution (4) reduces to the RN-AdS black hole.
The reference metric now can have a special choice
Without loss of generality we have set in our following discussions.
In terms of the radius of the horizon , the mass , Hawking temperature , entropy and electromagnetic potential of the black holes can be written as
In the extended phase space, the black hole mass is considered as the enthalpy rather than the internal energy of the gravitational system (37).
From Eq. (6), the equation of state of the black hole can be obtained
To compare with Van der Waals fluid equation in four dimensions, we can translate the “geometric” equation of state to a physical one by identifying the specific volume of the fluid with horizon radius of black hole as .
As usual, a critical point occurs when has an inflection point
which leads to
Evidently the critical behavior occurs when
, which is a joint effect of horizon topology and .
Previous thermodynamical discussions for RN-AdS black holes
show that the Van der Waals-like SBH/LBH only occurs for spherical horizon
topology . The graviton mass significantly modifies this behavior and
a non-zero admits that possibility of critical behavior for .
In addition, it has been shown (33) that when ,
the small and large black hole phases are both
locally thermodynamically stable because the corresponding heat capacities
are always positive
The equilibrium thermodynamics is governed by the Gibbs free energy, , which obeys the thermodynamic relation . For later discussions, it is convenient to rescale the Gibbs free energy in the following way: . Then reads
Here is understood as a function of pressure and temperature, , via the equation of state (7).
Iii Perturbations of charged topological AdS black hole in massive gravity
Now we study the evolution of a massless scalar field perturbation in the surrounding geometry of these charged topological AdS black holes.
A massless scalar field , obeys the Klein-Gordon equation
where is a normalizable harmonic function on the 2-dimensional hypersurface. In particular, the Laplace operator on yields
It is necessary to point out that the eigenvalue usually gets different values in consideration of different horizon topologies. For the spherical and flat topology, the eigenvalue can be zero. Then the radial function obeys
where are complex numbers , corresponding to the QNM frequencies of the oscillations describing the perturbation. For the hyperbolic horizon topology, the eigenvalue of the Laplace operator on cannot be zero (101); (102); (104); (103), and is given by , where , (105). Then the radial function obeys the following differential equation:
In this paper, we only consider , namely for .
We are going to study whether the signature of Van der Waals-like SBH/LBH phase transition of charged topological AdS black holes can be reflected by the dynamical QNMs behavior in the massless scalar perturbation. For Eqs. (15) and (16), we have in the limit of . At the AdS boundary , we need . Under these boundary conditions, we will numerically solve Eqs. (15) and (16) separately to find QNM frequencies by adopting the shooting method. In the context of the Van der Waals phase transition picture, the dynamical perturbations in the isobaric process and isothermal process will be discussed. In our following numerical computations we will set , , and .
iii.1 Isobaric phase transition
Due to the pressure (or ) being fixed in this case, the black hole horizon is the only variable in the system. The behavior of an isobar with different horizon topologies are plotted in Fig. 1. For , the oscillating part displays the occurrence of an SBH/LBH phase transition in the system and the Gibbs free energy depicts a swallow tail behavior, also signaling a first-order SBH/LBH phase transition. Here the intersection point indicates the coexistence of two phases in equilibrium. The critical pressure is obtained by .
In Table. 1(see appendix), we further list the QNM frequencies of massless scalar perturbation around small and large black holes for a first order SBH/LBH phase transition. Fixing the pressure with , we obtain the phase transition temperature , and in the cases of , 0 and 1, respectively, where the small and large black hole phases can coexist. With regard to a small black hole phase, the radius of black hole becomes smaller and smaller when the temperature decreases from the phase transition temperature . In this process the absolute values of the imaginary part of the QNM frequencies decrease, while the real part frequencies change very little. On the other hand, when the temperature for the large black hole phase increases from the phase transition temperature , the black hole gets bigger. The QNM frequencies increase in the real and absolute value of imaginary parts. Consequently, the massless scalar perturbation outside the black hole gets more oscillations but it decays faster. These results are consistent with the overall discussions reported in (97); (98). Figure 2 illustrates the QNM frequencies for small and large black hole phases. Increase in the black hole size is indicated by the arrows.
In addition, at the critical position , with for , for and for , a second-order phase transition occurs. The QNM frequencies of the small and large black hole phases are plotted in Fig. 3. We see that QNM frequencies of two black hole phases show the same behavior as the black hole horizon increases at the critical point.
iii.2 Isothermal phase transition
Fixing the black hole temperature , the associated diagram of charged topological AdS black holes is displayed in the right part of Fig. 4. For there is an inflection point and behavior is reminiscent of the Van der Waals liquid-gas system. Moreover, the behavior of Gibbs free energy is plotted in the left panel of Fig. 4. Similarly to Fig. 1, characteristic first order SBH/LBH phase transition behavior shows up.
Table 2 (see appendix) displays the QNM frequencies of small and large black hole phases at temperature for different horizon topologies in the isothermal precess. Then the first order SBH/LBH phase transition happens at for , at for and at for , where the small and large black holes possess the same Gibbs free energy and same pressure. The data above (below) the horizontal line are for the small (large) black hole phase, respectively. The drastically different QNM frequencies for small and large black hole phases are plotted in Fig. 5. From the figure we see different slopes of the QNM frequencies in the massless scalar perturbations revealing that small and large black holes are in different phases.
In the isothermal transition, the QNMs can be affected by the value of the pressure and the horizon radius , which are related by a fixed temperature. To illustrate the effects of the two parameters, we list the influence of on the frequencies for small and large black holes by fixing in Table 3 (see appendix) and QNM frequencies by fixing the black hole size in Table 4 (see appendix). From Tables 3 and 4 one can see that there is competition between the pressure and horizon radius . Each of these parameters aims to overwhelm the other which affects the decay rate of the field.
In order to further discuss how these two factors affect the QNM frequencies, we perform a double-series expansion of the frequency
Obviously, the changes of the QNM frequency are under two influences, one is from the change of the black hole size and the other is from the change of the pressure (or AdS radius ). For simple discussions, we define and .
Note that the choice of the step of pressure in linear approximation is related to , which is brought about by
from the equation of state (7). In Table 5 (see appendix), we list the QNM frequencies from the linear approximation for small and large black hole phase. One can see that the behavior of is in good agreement with the numerical computation results listed in Table 2. Comparing and in Table 5, the change of (or ) in small black hole phase clearly wins over the change of the black hole size, which dominantly contributes to the behavior of QNM frequencies for small black hole phase. For the large black hole phase, the contributions of and on the real part of the QNM frequency are comparable. But the change of (or ) wins out a little.
In addition, for the isothermal phase transition at , the QNM frequencies for the small black hole and large black hole are plotted in Fig. 6, which shows the same behavior as the horizon radius increases.
Iv Conclusions and discussions
We have calculated the QNMs of massless scalar field perturbation around small and large charged topological AdS black holes in four-dimensional dRGT massive gravity. When the Van der Waals-like SBH/LBH phase transition happens in the extended space, no matter whether in the isobaric process by fixing the pressure or in the isothermal process by fixing the temperature of the system, the slopes of the QNM frequencies change drastically being different in the small and large black hole phases as the horizon radius is increasing. This clearly shows the signature of the phase transition between small and large black holes. Moreover, we have also found that, at the critical isothermal and isobaric phase transitions, QNM frequencies for both small and large black holes have the same behavior, suggesting that QNMs are not appropriate to probing the black hole second order phase transition.
Comparing with the action of Eq. (1), Ref. (73) recently asserted the existence of a Van der Waals-like SBH/LBH phase transition with the massive potential in the five dimensional case. Moreover, the charged black hole (23), the Born-Infeld black hole (32) and black hole in the Maxwell and Yang-Mills fields (24) have recently been constructed in Gauss-Bonnet massive gravity. The Van der Waals-like SBH/LBH phase transition also appears in these models. It would be interesting to extend our discussion to these black hole solutions.
Acknowledgements.The work is supported by the National Natural Science Foundation of China (NNSFC) (Grant No.11605152), and Natural Science Foundation of Jiangsu Province (Grant No.BK20160452). D.C.Z. are extremely grateful to Hai-Qing Zhang and Hua-Bi Zeng for useful discussions.
V Appendix section
Here we present the related QNM frequencies of the massless scalar perturbation around small and large black holes in the isobaric as well as in the isothermal process.
- We thank Hai-Qing Zhang for pointing this out.
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