Stability of the isotropic pressure condition

被引：211
作者：
Herrera, L. [1 ]
机构：
[1] Univ Salamanca, Inst Univ Fis Fundamental & Matemat, Salamanca 37007, Spain
来源：
PHYSICAL REVIEW D | 2020年 / 101卷 / 10期
关键词：
THERMODYNAMICS; NONSTATIONARY; HEAT;
D O I：
10.1103/PhysRevD.101.104024
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We investigate the conditions for the (in)stability of the isotropic pressure condition in collapsing spherically symmetric, dissipative fluid distributions. It is found that dissipative fluxes, and/or energy density inhomogeneities and/or the appearance of shear in the fluid flow, force any initially isotropic configuration to abandon such a condition, generating anisotropy in the pressure. To reinforce this conclusion we also present some arguments concerning the axially symmetric case. The consequences of our results are analyzed.
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页数：10
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