Abstract
Treating the cosmological constant as thermodynamic pressure and its conjugate as thermodynamic volume, we investigate the critical behavior of the third-order Lovelock black holes in diverse dimensions. For black hole horizons with different normalized sectional curvature \(k=0,\pm 1\), the corresponding critical behaviors differ drastically. For \(k=0\), there is no critical point in the extended thermodynamic phase space. For \(k=-1\), there is a single critical point in any dimension \(d\ge 7\), and for \(k=+1\), there is a single critical point in \(7\) dimensions and two critical points in 8, 9, 10, 11 dimensions. We studied the corresponding phase structures in all possible cases.
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1 Introduction
The thermodynamics of a black hole has been a research frontier for several decades. In the presence of a negative cosmological constant, there can be very rich phase structures in the black hole thermodynamic phase space. Since the early work [1] on the phase transition in the Schwarzschild AdS black hole, which is presently known as a Hawking–Page transition, our understanding as regards black hole phase transitions has been greatly extended. An important example is the first-order phase transition in Reissner–Nordström-AdS (RN-AdS) spacetime [2–4], which has been compared with Van der Waals liquid–gas phase transition frequently.
Recently, the idea of including the cosmological constant in the first law of black hole has become popular [5–8]. Following this idea, the cosmological constant is no longer a fixed parameter, but rather a thermodynamic variable. The AdS background can be varying. One may doubt the necessity of this consideration. However, there are indeed some physical reasons for doing so [9–12]. Under this consideration, the black hole mass should be identified as the enthalpy \(H\) rather than the internal energy [5], and the cosmological constant becomes an effective thermodynamic pressure,
The thermodynamic volume \(V\) that is conjugate to \(P\) is naturally defined as \(V=(\frac{\partial H}{\partial P})_S\). A detailed study of the volume can be found in [13]. The temperature of the black hole is a function of the black hole radius (which is closely related to \(V\)) and the cosmological constant. Such a relationship can be inverted and taken as the equation of states (EOS) for the black hole system, and hence one can adopt the usual methods used in classical thermodynamics to analyze the critical behavior of the black hole.
There have been many papers pursuing the above idea for diverse choices of AdS black holes, and most works indicate that there is a close analogy between the \(P-V\) criticalities of AdS black holes and the phase transition in Van der Waals liquid–gas system. Reference [9] is an investigation of the 4-dimensional RN AdS black hole in the extended phase space, which proved that the analogy with Van der Waals system is very precise. Then the analogy has been extended to other cases, including higher dimensional charged black holes [9, 14, 15], rotating black holes and black rings [16–20], Gauss–Bonnet black holes [21–23], \(f(R)\) black holes [24], black holes with scalar hair [25, 26], black holes with nonlinear source [27], Born–Infeld black holes [28, 29], RN de Sitter black holes [30], and the third-order Lovelock–Born–Infeld black holes in \(d=7\) [31]. In a recent work [32], we studied the criticality of static Gauss–Bonnet black holes in AdS spacetime, taking the Gauss–Bonnet coupling constant as a free thermodynamic variable. See [33–36] for some related work.
In this work we shall study the \(P-V\) criticality of the static black holes in the third-order Lovelock gravity in diverse dimensions. In the presence of a cosmological constant, the black holes can be classified using the normalized sectional curvature of the black hole horizons. There are three different classes of black hole solutions in this classification scheme, i.e. black holes with horizon curvatures \(k=0,\pm 1\).
For \(k=0\), the EOS is identical to that of an ideal gas, thus no phase transition could occur. For \(k=+1\) and \(d=7\), there is one critical point and the first-order phase transition can easily be obtained. All these results are the same as in the work of [31]. Furthermore, we give a detailed analysis of \(k=\pm 1\) and \(d\ge 7\). For \(k=-1\), there is one critical point in any dimension \(d\ge 7\). When \(v=v_c\) the system is physical if and only if \(P=P_c\). Actually all the isobaric plots of temperature diverge at \(v=v_c\), except the one corresponding to \(P=P_c\). We can find the first-order phase transition at the isobaric plots of the Gibbs free energy in specific regions of \(P\). When \(k=+1\), the situation is a little more complicated. There is one critical point in \(7\) dimensions, there are two critical points in \(8,9,10,11\) dimensions, and no critical points in \(d\ge 12\) dimensions.
The paper is organized as follows. In the next section we will give a brief review of the thermodynamics of the third-order Lovelock black holes. In Sect. 3 we give the EOS and find the critical points in diverse dimensions. In Sect. 4 we investigate the critical behavior of the system. Finally in Sect. 5 we present some concluding remarks.
2 Thermodynamics of third-order Lovelock black holes
To start with we give a brief review of the thermodynamics of the third-order Lovelock black holes [37–39]. Setting the Newton constant \(G=1\), the action is given by
where the Gauss–Bonnet and the third-order Lovelock densities are given as
\(\alpha _{2}\) and \(\alpha _{3}\), respectively, are the second (i.e. Gauss–Bonnet) and the third Lovelock coefficients. For the particular choice of Gauss–Bonnet and Lovelock coefficients
it is well known that there exists an analytic static black hole solution of the form [37–39]
where \(k=0,\pm 1\) if \(\Lambda <0\) and \(k=+1\) if \(\Lambda \ge 0\), \(d\Omega _k^2\) is the line element on a \((d-2)\)-dimensional maximally symmetric Einstein manifold with curvature \(k\). We will be working mostly with \(\Lambda <0\); however, we shall see that \(P=-\frac{\Lambda }{8\pi }\) can become negative (i.e. \(\Lambda \) can become positive) in an isothermal process. The same phenomenon has also been observed while studying the \(P-V\) criticalities of other AdS black holes, see e.g. in [28] for the case of RN-AdS black hole. Since the \(P-V\) analysis may not be valid for \(\Lambda >0\), we consider the case \(\Lambda >0\) as unphysical in our paper.
The gravitational mass \(M\) can be expressed as \(\frac{(d-2)\Sigma _k}{16\pi G}m\), where \(\Sigma _{k}\) is the volume of the \((d-2)\)-dimensional submanifold just mentioned. The radius \(r_+\) of the black hole is one of the roots of \(f(r)\) (in AdS spacetime, it is the largest root of \(f(r)\)). Identifying \(H\equiv M\) we can rearrange the equations \(f(r_+)=0\) and \(T=\frac{f'(r_+)}{4\pi }\) in the form
Among various choices for the spacetime dimension \(d\), the particular case \(d=7\) is qualitatively different from other choices, because the last term in (9) vanishes when \(d=7\). Consequently, the temperature \(T\) vanishes as \(r_+\rightarrow 0\) when \(d=7\), while it becomes divergent as \(r_+\rightarrow 0\) in higher dimensions. That the case \(d=7\) is distinguished from the cases of higher dimensions is perhaps a consequence of the fact that \(d=7\) is the lowest dimension in which the third-order Lovelock density can affect the local geometry. We shall see later that the critical behavior in \(d=7\) is also distinguished from the cases of higher dimensions.
The other thermodynamic quantities which we need in the following discussions are given as follows. These are the black hole entropy [39]
and the thermodynamic volume
We see that the thermodynamic volume is a monotonic function of the radius of the horizon. The first law of black hole thermodynamics in the extended phase space can be expressed as
where \(\psi \) is the thermodynamic conjugate of \(\alpha \), which is given by
It should be remarked that in general cases the first law should contain contributions from the Gauss–Bonnet and Lovelock coefficients as independent thermodynamic variables. However, in our case, these two objects are proportional to each other and we are left with only a single parameter \(\alpha \) as given in (5). A detailed discussion of extended first Law and Smarr formula for Lovelock gravity can be found in [40].
The Gibbs free energy can be obtained by
Notice that although on the left hand side we have included \(T\) and \(P\) as independent variables for the Gibbs free energy, the right hand side does not explicitly contain \(T\). To understand Eq. (14), we must think of \(r_+\) as an implicit function of \(T\) and \(P\). The implicit relationship is given by the expression (9) for the temperature.
3 Equation of states and critical points
Equation (9) can be rearranged into the following form:
This equation can be regarded as the thermodynamic EOS for the black hole system. Instead of the thermodynamic volume \(V\), we introduce the parameter
as an effective specific volume. Then the EOS takes the form
which resembles the EOS of the Van der Waals system to some extent.
The critical points, if they exist, correspond to inflection points on the isotherms, i.e. they must obey the conditions
and \(\frac{\partial ^2 P}{\partial ^2 v}\) should change sign around each of the solutions. Merely finding the solution of (18) is insufficient to justify the existence of a critical point, because the second derivative \(\frac{\partial ^2 P}{\partial ^2 v}\) may not change sign around the solution, making the solution correspond to an extremum, rather than an inflection point. Later we shall see that when \(k=1\) and \(d=12\), the solution to (18) is indeed not an inflection point and thus no critical point exists in 12 dimensions.
Now let us proceed to finding all possible critical points for each value of \(k=0,\pm 1\) in diverse dimensions.
3.1 Ricci flat case with \(k=0\)
When \(k=0\), Eq. (17) reduces into
This equation is independent of the spacetime dimension \(d\) and is identical to the EOS of an ideal gas. The conditions (18) regarded as a system of algebraic equations for \(T\) and \(v\) have no finite nonzero solution, so there is no critical point when \(k=0\) in any dimension.
3.2 Hyperbolic case with \(k=-1\)
In this case, Eq. (17) becomes
Correspondingly, Eq. (18) possesses a single solution:
which can be checked to be a real critical point. The corresponding critical pressure is
The critical parameters \(v_c\) and \(T_c\) must all be real positive, so the existence of a critical point requires \(\alpha >0\). It is easy to check that
which depends only on \(d\) but not on any other parameters. Remember that the above critical point exists in all dimensions \(d\ge 7\).
3.3 Spherical case with \(k=1\)
In this case the EOS reads
We have two solutions to Eq. (18), which read
and
where
The corresponding pressures are given, respectively, as follows:
For these solutions to be real-valued, the constant \(\mathcal {A}\) must also be real-valued. This requires \(2\le d\le 12\). On the other hand, the third-order Lovelock density is geometrically nontrivial only when \(d\ge 7\), therefore, for \(k=+1\), critical points can only possibly exist in dimensions \(7\le d \le 12\). In particular, when \(d=12\), the above two solutions degenerate, and one can check that \(\frac{\partial ^2 P}{\partial ^2 v}\) does not change sign around this degenerate solution. When \(d=7\), both \(v_{c1}\) and \(T_{c1}\) vanish, with the corresponding \(P_{c1}\) going to negative infinity. Clearly \(v_{c1}=0\) does not correspond to a black hole configuration, so the first solution is excluded from the possible candidates of critical points when \(d=7\). One can check that for \(8\le d \le 11\), \(\frac{\partial ^2 P}{\partial ^2 v}\) indeed changes sign around each of the above solutions, and for \(d=7\), the above object also changes sign around the second solution. So we conclude that, when \(k=+1\), there will be a single critical point in dimensions \(d=7\) and two critical points in dimensions \(d=8,9,10,11\).
It is trivial to show that the combinations
are both only dependent on the dimension \(d\). The numerical values for the critical parameters are given in Tables 1 and 2. The values for \(P_c\) are given in units of \(\alpha ^{-1}\), those for \(v_c\) are given in units of \(\alpha ^{1/2}\) and for \(T_c\) are given in units of \(\alpha ^{-1/2}\). In all subsequent discussions we will stick to this system of units. The critical pressure \(P_{c1}\) is negative in dimensions \(d=8,9\). Although the black hole solutions remain valid for a positive cosmological constant, we consider them as unphysical in this paper.
4 Phase structures
4.1 Hyperbolic case with \(k=-1\)
Previous studies indicate that critical points may exist for AdS black holes with \(k=-1\) in various models of gravity. However, the behavior of such black holes near the criticalities is in some sense exotic and has been paid less attention to as compared to the cases of \(k=+1\) black holes. In this work, we will pay particular attention to the \(k=-1\) cases and show how exotic it is for such black holes.
As mentioned earlier, the Hawking temperature (9) (and hence the EOS) is qualitatively different for \(d=7\) and \(d>7\), so we shall subdivide our discussions into \(d=7\) and \(d>7\) cases.
4.1.1 The case of \(d=7\)
In the rest of the paper, we will treat the thermodynamics of the Lovelock AdS black holes as a \(P-V\)–\(T\) system, taking the Lovelock coefficient \(\alpha \) as a constant parameter. This is of course an incomplete description of the Lovelock black holes, because the coupling coefficient \(\alpha \) should also play a role in the thermodynamics of the black holes, just like in the case of GB AdS black holes [32].
Figure 1 gives the isobaric and isothermal plots for our \(P-V\)–\(T\) system at \(d=7\) and \(k=-1\), in which the parameter \(\alpha \) is taken to be equal to \(1\). The critical value of the parameters are \(P_c=\frac{5}{8\pi }\), \(v_c=\frac{4}{5}\), and \(T_c=\frac{1}{2\pi }\).
From the isobaric plots given in Fig. 1, one can see that for each \(P<P_c\), there is a region for \(v\) containing \(v_c\) such that the temperature \(T\) goes negative, which means that black holes with such parameters are thermodynamically unstable and should not exist actually. Meanwhile, on the isothermal plots, one sees that for sufficiently low temperatures \(T<T_c\), there is a segment on the isotherms such that the pressure becomes negative. Such black hole states are physically impossible, because negative \(P\) corresponds to positive cosmological constant \(\Lambda \), and it is well known that black holes with positive cosmological constant cannot have \(k=-1\).
To have more intuitive feelings on the critical behavior of the \(d=7\), \(k=-1\) black holes, let us turn to look at the Gibbs free energy plots. Since \(G=G(T,P)\), we will consider separately isobaric and isothermal processes.
The isobaric plots of the EOS and Gibbs free energy are presented respectively for black holes with constant \(P>P_c\) and \(P<P_c\) in Figs. 2, 3, 4. Figure 2 is a typical case with \(P>P_c\). It can be seen that, at the temperature \(T_1\), there can be three different black hole phases with different \(v\), among these, the “small black hole” marked with the letter b and the “large black hole” marked with g are both thermodynamically stable, while the “medium sized black hole” marked with e is thermodynamically unstable. The black hole phases b and g coexist at temperature \(T_1\), because these two phases have the same Gibbs free energy. At temperatures lower than the temperature of the black hole state f, only the small black hole phase exists, while at temperatures higher than the temperature of the black hole state g, the large black hole phase is thermodynamically favored. The shape of the Gibbs free energy plot can be thought of as containing a swallow tail with one tip extending infinitely long to the right (i.e. the high temperature end). Figures 3 and 4 both correspond to cases \(P<P_c\). The difference lies in the pressure in Fig. 4, which is even lower than that in Fig. 3, so that in Fig. 3, there still exists a stable small black hole phase, which coexists with the large black hole phase at temperature \(T_2\), while in Fig. 4, the only stable black hole phase is the large black hole phase (\(T_2\) becomes negative). The swallow tails in the Gibbs free energy curves in these two figures are both incomplete, because a small/large portion of the tail extends to the negative temperature axes and hence are cut off from the physical region of the thermodynamical phase space.
Let us now turn to look at the isothermal plots of the EOS and Gibbs free energy. These plots are given in Figs. 5, 6, 7. Figure 5 gives the isothermal plots of the EOS and Gibbs free energy at \(T>T_c\). It can be seen that at low pressure, the large black hole phase (segment b-g and onwards on the isotherm) is thermodynamically preferred. At high pressure, the small black hole phase (segment b-a and onwards) is thermodynamically preferred. Note that although the Gibbs free energy curve looks like containing a complete swallow tail, the curve is actually discontinuous at the point c. Both Figs. 6 and 7 correspond to the case \(T<T_c\), the only difference lies in Fig. 7, which corresponds to a temperature even lower than that in Fig. 6, so that a portion of the isobaric curves in Fig. 7 become unphysical (i.e. extend to negative pressure). The phase structure is basically the same as in the case of \(T>T_c\), i.e. large black holes are favored at low pressures and small black holes are favored at high pressures.
4.1.2 The cases of \(d>7\)
When \(d>7\), the last term in (9) dominates at small \(v\), which results in a significant difference as compared to the \(d=7\) case. Apart from this, there is no qualitative difference between the different dimensions if they are all above seven.
The best way to illustrate the difference from the case of \(d=7\) is via a plot of the EOS. Figure 8 gives the isobaric and isothermal plots of the EOS at \(d=8\), which is in analogy to Fig. 1 for the \(d=7\) case. The most significant difference from Fig. 1 lies in the fact that all isobaric curves tend to \(T\rightarrow -\infty \) as \(v\rightarrow 0\). However, there is no qualitative difference in the isothermal curves at positive \(T\).
The phase structure for the \(d>7\) cases can be worked out exactly as in the \(d=7\) case. The resulting phase structure is extremely similar to the \(d=7\) case, the only difference lies in the fact that at low pressure, the thermodynamically favored small black hole phase cannot become arbitrarily small; there always exists a smallest \(v_a\ne 0\), which corresponds to a zero temperature small black hole. If \(v\) goes even smaller, the temperature becomes negative, which indicates that the corresponding small black hole becomes unstable and cannot exist physically. For illustrative purposes, we present the isobaric plots for the EOS and Gibbs free energy for \(d=8\), \(k=-1\) black holes in Figs. 9, 10, 11. These plots are created in complete analogy to Figs. 2, 3, 4. The isothermal plots analogous to Figs. 5, 6, 7 for the \(d=8\) case do not reveal any further novelty or difference from the \(d=7\) case, so we omit these plots.
4.2 Spherical case with \(k=+1\)
Now we consider the case of \(k=+1\). When \(d=7\), the last term in the EOS (25) vanishes, the dominating term at small \(v\) is the second last term, making \(P\rightarrow +\infty \) as \(v\rightarrow 0\) (for positive constant \(T\)). In contrast, when \(d>7\), the last term in (25) dominates at small \(v\), making \(P\rightarrow -\infty \) as \(v\rightarrow 0\). Therefore, it is still necessary to distinguish the case of \(d=7\) from the \(8\le d \le 11\) cases (the cases \(d>11\) are excluded because there is no critical point in such cases).
4.2.1 The case of \(d=7\)
First we consider the case of \(d=7\). As indicated in the last section, there is a single critical point in this dimension. Figure 12 gives the isothermal plots for the EOS and the Gibbs free energy at \(k=+1\) and \(d=7\). It can be seen that at \(T>T_{c}\) (here \(T_c = T_{c2}\) is the only critical temperature in \(d=7\)), there is only a single phase which is in analogy to the thermal behavior of an ideal gas. At \(T<T_c\), multiple phases begin to appear. It is remarkable that for sufficiently low temperature \(T\), there can be a segment in the isotherms which corresponds to negative pressure \(P\). We consider it as unphysical.
For \(P>0\), there can be up to three black hole phases at the same pressure, among these, the small black hole phase is favored at high pressure, while the large black hole phase is favored at low pressure. The two thermodynamically favored black hole phases can coexist at some intermediate pressure, while the intermediately sized black hole phase is always thermodynamically unfavored.
4.2.2 The cases of \(8\le d \le 11\)
Now we investigate the case of \(8\le d\le 11\) by analyzing the isothermal plots of EOS and Gibbs free energy. In these dimensions there are always two critical points. In \(d=8,9\), the critical pressure \(P_{c1}\) becomes negative, which is unphysical. In \(d=10,11\), \(P_{c1}\) remains positive. We shall consider the case of \(d=8,9\) and \(d=10,11\) separately.
First we consider the cases \(d=8,9\). These two cases are not qualitatively different from each other, and so, without loss of generality, we only present the detailed analysis in \(d=9\). The two critical pressures are \(P_{c1}=-0.0856\) and \(P_{c2}=0.3928\). The critical temperatures are \(T_{c1}=0.2046\) and \(T_{c2}=0.2302\). Figure 13 gives the isothermal plots for the EOS at \(k=+1\) and \(d=9\), which is quite similar with the \(P-V\) diagram of BI-AdS black holes [28]. Regardless of the value of temperature, the pressure goes to negative infinity as \(v\rightarrow 0\) and vanishes as \(v\rightarrow \infty \). It can be seen that at \(T_{c1}<T<T_{c2}\), multiple phases begin to appear. Note that in this region of the temperature, each isotherm possesses three extrema, and it will be clear that at each of these extrema the derivative of the Gibbs free energy with respect to the pressure is discontinuous.
In Figs. 14 and 15 we depict two particular temperatures and re-plot the EOS together with the corresponding Gibbs free energy curve. It can be seen from these plots that at some temperature in between \(T=0.2075\) and \(T=0.2100\) the system begins to develop a first-order phase transition at a particular point in the region \(P>0\). However, the exact value of the temperature at which the phase transition begins to appear is very difficult to determine. When the first-order phase transition point is developed, there is also some possibility for the existence of a zeroth-order phase transition in the region \(P>0\), which occurs when the pressure at the marked point f is higher than it is at the marked point a in Fig. 15. We consider the region of \(P<0\) as unphysical.
Next we consider the cases of \(d=10,11\). These phase structures in two dimensions are qualitatively similar, so we take \(d=11\) as an example. The critical pressures are \(P_{c1}=0.1194\) and \(P_{c2}=0.1385\), respectively, both are positive. The critical temperatures are \(T_{c1}=0.3183\) and \(T_{c2}=0.3221\).
In Fig. 16 we present the isothermal plots for the EOS in \(d=11\) and \(k=+1\). Multiple phases can appear at temperatures \(T\) in between \(T_{c1}\) and \(T_{c2}\). Unlike the cases \(d=8,9\), both \(P_{c1}\) and \(P_{c2}\) are positive and physical, so one does not need to take care of the negative pressure region. In analogy to Figs. 14 and 15, we depict the EOS and \(G-P\) diagrams in Figs. 17 and 18, with the former corresponding to the cases in when no first-order phase transition occurs and the latter to the cases when a first-order phase transition develops in the \(P>0\) region. In the latter case, if the pressure at the point d exceeds that at the point b, there is a possibility for the existence of a zeroth-order phase transition in the region \(P>0\).
5 Concluding remarks
Although the extended phase space thermodynamics for the third-order Lovelock gravity has been studied in some previous works, e.g. [31, 41], exploring the thermodynamic phase space in different spacetime dimensions reveals unexpected rich phase structures, which are overlooked in those works.
In this paper we explored the phase structures for the third-order Lovelock gravity in diverse dimensions. Special emphasis is put on the dependence on the spacetime dimensions as well as on the spatial curvature of the black hole horizons. Our work extends that of [31] in that all spacetime dimensions which admit the existence of critical points are worked out, and in that the case \(k=-1\) is explored in much more detail. The more recent work [41] studied the phase structures of Lovelock–Born–Infeld gravity and did consider the dependence on the spacetime dimensions. However, the authors of that paper worked out only a single critical point and erroneously described \(d=12\) with \(k=1\) as a dimension allowing for the existence of critical point. Our work indicates that when \(k=1\), only the dimensions \(7\le d\le 11\) allow for the existence of critical points.
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Xu, H., Xu, W. & Zhao, L. Extended phase space thermodynamics for third-order Lovelock black holes in diverse dimensions. Eur. Phys. J. C 74, 3074 (2014). https://doi.org/10.1140/epjc/s10052-014-3074-1
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DOI: https://doi.org/10.1140/epjc/s10052-014-3074-1