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.

引用

页数：8

共 18 条

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