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arXiv 1806.09516gr-qchep-th
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具有任意宇宙学常数的二次引力中的精确黑洞

Exact black holes in quadratic gravity with any cosmological constant

Robert Svarc, Jiri Podolsky, Vojtech Pravda, Alena Pravdova

摘要:

本文提出了一类新的具有宇宙学常数的广义二次引力黑洞。这些球对称的Schwarzschild-Bach-(anti-)de Sitter几何(Schwa-Bach-(A)dS)是在标量曲率为常数的假设下导出的,它们形成了一个由黑洞视界位置、视界上Bach不变量值和宇宙学常数决定的三参数族。利用一个与Kundt度规共形的矩阵,将四阶场方程简化为一个紧凑的自治系统。它的解是以幂级数形式存在的,这使得我们可以直接将巴赫参数和/或宇宙学常数设为零。为了解释这些时空,我们分析了度规函数。特别地,我们证明了对于一定范围的正宇宙学常数,存在黑洞和宇宙学视界,在它们之间有一个静态区域。还确定了潮汐对自由试验粒子的影响和基本热力学量。

英文摘要:

We present a new explicit class of black holes in general quadratic gravity with a cosmological constant. These spherically symmetric Schwarzschild-Bach-(anti-)de Sitter geometries (Schwa-Bach-(A)dS), derived under the assumption of constant scalar curvature, form a three-parameter family determined by the black-hole horizon position, the value of Bach invariant on the horizon, and the cosmological constant. Using a conformal to Kundt metric ansatz, the fourth-order field equations simplify to a compact autonomous system. Its solutions are found as power series, enabling us to directly set the Bach parameter and/or cosmological constant equal to zero. To interpret these spacetimes, we analyse the metric functions. In particular, we demonstrate that for a certain range of positive cosmological constant there are both black-hole and cosmological horizons, with a static region between them. The tidal effects on free test particles and basic thermodynamic quantities are also determined.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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