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arXiv 0705.2368gr-qc
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具有真空暗流体的正则齐次T模型

Regular homogeneous T-models with vacuum dark fluid

K. A. Bronnikov, I. G. Dymnikova

摘要:

我们提出了一类带有真空暗流体的正则齐次T模型,它与一个可变的宇宙学项相关联。真空流体由其应力-能量张量的对称性定义,即,在洛仑兹作用下,它的不变性在一个特殊的空间方向(pj =-ρ)上增强,这使得这种流体本质上是各向异性的,并允许它的密度演化。齐次正则T模型的典型特征是:存在一个Killing视界;从视界的零爆炸开始宇宙演化;存在一个宇宙观测者可见的正则静态爆炸前区域;从各向异性真空中产生物质,伴随着非常快速的各向同性化。我们详细研究了球对称正则T模型的基础上的一般精确解的真空流体和尘埃物质的混合物,并应用它给出一个特定的模型,说明宇宙学T模型的能力,以满足观测约束的数值估计。

英文摘要:

We present the class of regular homogeneous T-models with vacuum dark fluid, associated with a variable cosmological term. The vacuum fluid is defined by the symmetry of its stress-energy tensor, i.e., its invariance under Lorentz boosts in a distinguished spatial direction (p_j=-ρ), which makes this fluid essentially anisotropic and allows its density to evolve. Typical features of homogeneous regular T-models are: the existence of a Killing horizon; beginning of the cosmological evolution from a null bang at the horizon; the existence of a regular static pre-bang region visible to cosmological observers; creation of matter from anisotropic vacuum, accompanied by very rapid isotropization. We study in detail the spherically symmetric regular T-models on the basis of a general exact solution for a mixture of the vacuum fluid and dustlike matter and apply it to give numerical estimates for a particular model which illustrates the ability of cosmological T-models to satisfy the observational constraints.

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