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arXiv 0805.2610hep-thgr-qc
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手征点处宇宙拓扑大质量引力的不稳定性

Instability in cosmological topologically massive gravity at the chiral point

Daniel Grumiller, Niklas Johansson

摘要:

我们考虑了在Einstein-Hilbert项为正号的手征点处的宇宙拓扑有质量引力。我们证明了存在一个负能量散装模式,线性增长的时间。除非有物理上的理由抛弃这个模式,否则这个理论是不稳定的。为了解决这个问题,我们证明了该模式不是纯规范,其负能量是时间无关的和有限的。等距生成器L_0和\bar{L}_0具有类似于对数CFT中的非酉矩阵表示。虽然新模式服从的边界条件比Brown和Henneaux的边界条件稍弱,但它的衰减行为与时空渐近AdS_3是相容的。我们采用全息重整化来证明变分原理是定义良好的。相应的Brown-York应力张量是有限的、无迹的和守恒的。最后,我们解决的可能性,以消除手征引力的不稳定性和前景。

英文摘要:

We consider cosmological topologically massive gravity at the chiral point with positive sign of the Einstein-Hilbert term. We demonstrate the presence of a negative energy bulk mode that grows linearly in time. Unless there are physical reasons to discard this mode, this theory is unstable. To address this issue we prove that the mode is not pure gauge and that its negative energy is time-independent and finite. The isometry generators L_0 and \bar{L}_0 have non-unitary matrix representations like in logarithmic CFT. While the new mode obeys boundary conditions that are slightly weaker than the ones by Brown and Henneaux, its fall-off behavior is compatible with spacetime being asymptotically AdS_3. We employ holographic renormalization to show that the variational principle is well-defined. The corresponding Brown-York stress tensor is finite, traceless and conserved. Finally we address possibilities to eliminate the instability and prospects for chiral gravity.

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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