The singularity in mimetic Kantowski-Sachs cosmology

The singularity in mimetic Kantowski-Sachs cosmology
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模仿康托夫斯基-萨克斯宇宙学中的奇点

DOI:
10.1088/1475-7516/2020/07/018
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发表时间:
2020
影响因子:
6.4
通讯作者:
E. Wilson
E. Wilson
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
M. de Cesare;S. Seahra;E. Wilson

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在所谓的极限曲率模拟重力理论中研究了真空Kantowski-Sachs时空动力学。证明了在该理论中真空Kantowski-Sachs时空总是奇异的。虽然由于极限曲率模拟理论对广义相对论的偏离确实提供了膨胀标量大小的上界,但其振荡速率和定向哈勃速率的大小都没有边界地增加,并导致曲率不变量发散。此外,由于径向尺度因子不会在有限的(过去的)时间内消失,在这个特殊的理论中,Kantowski-Sachs时空不能与零黑洞事件视界相匹配,因此,不对应于静态和球对称黑洞的内部。
The dynamics of the vacuum Kantowski-Sachs space-time are studied in the so-called limiting curvature mimetic gravity theory. It is shown that in this theory the vacuum Kantowski-Sachs space-time is always singular. While the departures from general relativity due to the limiting curvature mimetic theory do provide an upper bound on the magnitude of the expansion scalar, both its rate of oscillations and the magnitude of the directional Hubble rates increase without bound and cause curvature invariants to diverge. Also, since the radial scale factor does not vanish in finite (past) time, in this particular theory the Kantowski-Sachs space-time cannot be matched to a null black hole event horizon and, therefore, does not correspond to the interior of a static and spherically symmetric black hole.
渐近自由拟态引力中的非平坦宇宙和黑洞
DOI: 10.1002/prop.201900103
发表时间: 2019
期刊: Fortschritte der Physik
影响因子: --
作者:
Chamseddine, Ali H.;Mukhanov, Viatcheslav;Russ, Tobias B.
通讯作者: Russ, Tobias B.
DOI: 10.1007/jhep11(2013)135
发表时间: 2013-11-18
影响因子: 5.4
作者:
Chamseddine, Ali H.;Mukhanov, Viatcheslav
通讯作者: Mukhanov, Viatcheslav