科研之友
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摘要
We describe inhomogeneities in a Lambda CDM universe with a gradient series expansion and show that it describes the gravitational evolution far into the nonlinear regime and beyond the capacity of standard perturbation theory at any order. We compare the gradient expansion with exact inhomogeneous Lambda LTB solutions (Lemaitre-Tolman-Bondi metric with the inclusion of a cosmological constant) describing growing structure in a Lambda CDM universe and find that the expansion approximates the exact solution well, following the collapse of an over-density all the way into a singularity.
- 出版日期2012-8-17
