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arXiv 2004.10139gr-qchep-th
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Horndeski引力中的极端宇宙学黑洞和反蒸发区

Extremal cosmological black holes in Horndeski gravity and the anti-evaporation regime

Ismael Ayuso, Diego Sáez-Chillón Gómez

摘要:

本文在最一般的二阶标量张量理论--所谓Horndeski引力理论的框架内分析了极端宇宙学黑洞。这种~极值黑洞是Schwarzschild-De Sitter黑洞的一个特例,它是在黑洞视界与宇宙视界重合时产生的。这种度规是由有效宇宙学常数的特定值引起的,被称为纳里埃时空。当考虑Horndeski拉格朗日量时,研究了这类解的存在性,并分析了其稳定性,其中研究了所谓的反蒸发区。与其他框架相反,当考虑线性阶扰动时,Horndeski拉格朗日量的某些情况下视界半径保持稳定。

英文摘要:

Extremal cosmological black holes are analysed in the framework of the most general second order scalar-tensor theory, the~so-called Horndeski gravity. Such~extremal black holes are a particular case of Schwarzschild-De Sitter black holes that arises when the black hole horizon and the cosmological one coincide. Such~metric is induced by a particular value of the effective cosmological constant and is known as Nariai spacetime. The~existence of this type of solutions is studied when considering the Horndeski Lagrangian and its stability is analysed, where the so-called anti-evaporation regime is studied. Contrary to other frameworks, the~radius of the horizon remains stable for some cases of the Horndeski Lagrangian when considering perturbations at linear order.

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