Gravitational backreaction of matter inhomogeneities

Gravitational backreaction of matter inhomogeneities
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物质不均匀性的引力逆反应

DOI:
10.1088/1475-7516/2006/12/001
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发表时间:
2006
影响因子:
6.4
通讯作者:
M. Redi
M. Redi
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
A. Gruzinov;M. Kleban;M. Porrati;M. Redi

文献摘要

被引文献

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爱因斯坦方程的非线性使得小尺度物质的不均匀性在宇宙距离上影响宇宙成为可能。我们使用一个简单的启发式模型来研究这种效应的大小,该模型捕获了由非相对论性物质引起的最重要的逆反应效应,以及描述非均匀和各向异性膨胀宇宙的几个精确解。我们发现效应为0 (H2l2/c2)或更小,其中H为哈勃参数,l为非均匀性的典型尺寸尺度。对于虚拟化结构,这是v2/c2阶,其中v是特征特殊速度。
The non-linearity of Einstein’s equations makes it possible for small scale matter inhomogeneities to affect the universe at cosmological distances. We study the size of such effects using a simple heuristic model that captures the most important backreaction effect due to non-relativistic matter, as well as several exact solutions describing inhomogeneous and anisotropic expanding universes. We find that the effects are O(H2l2/c2) or smaller, where H is the Hubble parameter and l the typical size scale of inhomogeneities. For virialized structures this is of order v2/c2, where v is the characteristic peculiar velocity.