More about the Tolman-Oppenheimer-Volkoff equations for the generalized Chaplygin gas

被引：35
作者：
Gorini, V. [1 ,2 ]
Kamenshchik, A. Yu. [3 ,4 ,5 ]
Moschella, U. [1 ,2 ]
Piattella, O. F. [1 ,2 ]
Starobinsky, A. A. [5 ]
机构：
[1] Univ Insubria, Dipartimento Matemat & Fis, I-22100 Como, Italy
[2] Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy
[3] Dipartimento Fis, I-40126 Bologna, Italy
[4] Ist Nazl Fis Nucl, I-40126 Bologna, Italy
[5] LD Landau Theoret Phys Inst, Moscow 119334, Russia
来源：
PHYSICAL REVIEW D | 2009年 / 80卷 / 10期
关键词：
WORMHOLES;
D O I：
10.1103/PhysRevD.80.104038
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We investigate the Tolman-Oppenheimer-Volkoff equations for the generalized Chaplygin gas with the aim of extending the findings of V. Gorini, U. Moschella, A. Y. Kamenshchik, V. Pasquier, and A. A. Starobinsky [Phys. Rev. D 78, 064064 (2008)]. We study both the standard case, where we reproduce some previous results, and the phantom case. In the phantom case we show that even a superluminal group velocity arising for alpha > 1 cannot prevent the divergence of the pressure at a finite radial distance. Finally, we investigate how a modification of the generalized Chaplygin gas equation of state, required by causality arguments at densities very close to Lambda, affects the results found so far.
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页数：8
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