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arXiv 1409.4115gr-qc
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具有体$f(\mathcal{R})$引力的球对称膜时空

Spherically symmetric brane spacetime with bulk $f(\mathcal{R})$ gravity

Sumanta Chakraborty, Soumitra SenGupta

摘要:

在五维体作用量中引入$f(\mathcal{R})$项,利用Gauss-Codazzi方程导出了膜上的有效爱因斯坦方程。在不同的暗辐射和暗压力条件下求解该有效方程,得到不同的球对称解。其中一些静态球对称解对应于黑洞解,其参数由体积引起。特别地,暗压力项和暗辐射项(Weyl曲率的电部分)对膜球对称解有显著的影响。我们已经解决了一个参数组的共形运动的暗辐射和暗压力项,正是利用相应的李对称性。研究了这些球对称时空的各种热力学特征,表明存在二级相变。这种现象起源于大体积中具有$f(\mathcal{R})$重力的高曲率项。

英文摘要:

Introducing $f(\mathcal{R})$ term in the five-dimensional bulk action we derive effective Einstein's equation on the brane using Gauss-Codazzi equation. This effective equation is then solved for different conditions on dark radiation and dark pressure to obtain various spherically symmetric solutions. Some of these static spherically symmetric solutions correspond to black hole solutions, with parameters induced from the bulk. Specially, the dark pressure and dark radiation terms (electric part of Weyl curvature) affect the brane spherically symmetric solutions significantly. We have solved for one parameter group of conformal motions where the dark radiation and dark pressure terms are exactly obtained exploiting the corresponding Lie symmetry. Various thermodynamic features of these spherically symmetric space-times are studied, showing existence of second order phase transition. This phenomenon has its origin in the higher curvature term with $f(\mathcal{R})$ gravity in the bulk.

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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