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arXiv 0907.1411gr-qchep-th
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二次曲率修正下高维引力理论中的黑洞

Black Holes in Higher Dimensional Gravity Theory with Quadratic in Curvature Corrections

Valeri P. Frolov, Ilya L. Shapiro

摘要:

本文在高维引力的框架下讨论了静态球对称黑洞的二次曲率项。这样的术语自然出现的结果,量子校正引起的量子场在引力背景中传播。我们把注意力集中在形式${\cal C}^2=C_{αβγδ} C^{αβγδ}$的校正上。四维时空中的高斯-博内方程使我们能够将作用量中的这一项简化为里奇张量和标量曲率中的二次项。因此,史瓦西解是里奇平坦的,也是具有Weyl标量${\cal C}^2$修正的理论解。一个重要的新特点的空间与尺寸$D > 4$是,在存在的外尔曲率平方项的解决方案必须不同于相应的“经典”真空Tangherlini度量。这种差异与{ \em继发}或{ \em诱导}毛发的存在有关。假设引力半径$r_0$远大于量子修正的尺度,我们探讨了如何通过量子修正来修正Tangherlini解。我们还表明,找到一个一般的解决方案超出了摄动方法可以减少到解决一个单一的三阶常微分方程(主方程)。

英文摘要:

Static spherically symmetric black holes are discussed in the framework of higher dimensional gravity with quadratic in curvature terms. Such terms naturally arise as a result of quantum corrections induced by quantum fields propagating in the gravitational background. We focus our attention on the correction of the form ${\cal C}^2=C_{αβγδ} C^{αβγδ}$. The Gauss-Bonnet equation in four-dimensional (4D) spacetime enables one to reduce this term in the action to the terms quadratic in the Ricci tensor and scalar curvature. As a result the Schwarzschild solution which is Ricci flat will be also a solution of the theory with the Weyl scalar ${\cal C}^2$ correction. An important new feature of the spaces with dimension $D > 4$ is that in the presence of the Weyl curvature-squared term a solution necessary differs from the corresponding `classical' vacuum Tangherlini metric. This difference is related to the presence of {\em secondary} or {\em induced} hair. We explore how the Tangherlini solution is modified by `quantum corrections', assuming that the gravitational radius $r_0$ is much larger than the scale of the quantum corrections. We also demonstrated that finding a general solution beyond the perturbation method can be reduced to solving a single third order ODE (master equation).

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