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arXiv 1405.4935hep-th
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含Horndeski源的BTZ黑洞解的热力学

Thermodynamics of a BTZ black hole solution with an Horndeski source

Moises Bravo-Gaete, Mokhtar Hassaine

摘要:

在三维空间中,我们考虑一个特定的截断Horndeski行动,减少到爱因斯坦-希尔伯特拉格朗日与宇宙学常数$Λ$和标量场,其动力学是由其通常的动力学项与非最小动力学耦合。要求守恒流的径向分量为零,解决方案原来是一个径向标量场定义在视界的BTZ黑洞几何。这特别意味着与物质源相关的应力张量在壳层上表现为有效的宇宙学常数项。我们构造了一个欧几里德作用量,它的场方程与原来的一致,并且使得对守恒流径向分量的约束也表现为场方程。借助于这种欧几里德作用量,我们导出了溶液的质量和熵,并发现它们与BTZ溶液的质量和熵成正比,其总因子取决于宇宙学常数.实性条件和质量的正性使宇宙学常数从上到下被限定为$Λ\leq-\frac{1}{l^2}$,其中极限情况$Λ=-\frac{1}{l^2}$简化为具有消失的标量场的BTZ解。利用约化作用量的标度对称性,我们还得到了通常的三维Smarr公式。在最后一节中,我们将这些结果推广到高维空间,其中度规是平面视界的Schwarzschild-AdS时空。

英文摘要:

In three dimensions, we consider a particular truncation of the Horndeski action that reduces to the Einstein-Hilbert Lagrangian with a cosmological constant $Λ$ and a scalar field whose dynamics is governed by its usual kinetic term together with a nonminimal kinetic coupling. Requiring the radial component of the conserved current to vanish, the solution turns out to be the BTZ black hole geometry with a radial scalar field well-defined at the horizon. This means in particular that the stress tensor associated to the matter source behaves on-shell as an effective cosmological constant term. We construct an Euclidean action whose field equations are consistent with the original ones and such that the constraint on the radial component of the conserved current also appears as a field equation. With the help of this Euclidean action, we derive the mass and the entropy of the solution, and found that they are proportional to the thermodynamical quantities of the BTZ solution by an overall factor that depends on the cosmological constant. The reality condition and the positivity of the mass impose the cosmological constant to be bounded from above as $Λ\leq-\frac{1}{l^2}$ where the limiting case $Λ=-\frac{1}{l^2}$ reduces to the BTZ solution with a vanishing scalar field. Exploiting a scaling symmetry of the reduced action, we also obtain the usual three-dimensional Smarr formula. In the last section, we extend all these results in higher dimensions where the metric turns out to be the Schwarzschild-AdS spacetime with planar horizon.

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