期刊
ASTROPHYSICAL JOURNAL
卷 757, 期 2, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/0004-637X/757/2/145
关键词
cosmology: theory; large-scale structure of universe
资金
- KRF
- Korean Government [KRF-2008-341-C00022]
- NRF [R1A1A2038497]
- KOSEF [2010-0000302]
- Korean Government (MEST)
- National Research Council of Science & Technology (NST), Republic of Korea [2012140001] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2012R1A1A2038497, 00000004, 2008-0093873, 2009-0078118] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
We compare the cosmological first-order post-Newtonian (1PN) approximation with the relativistic cosmological linear perturbation theory in a zero-pressure medium with the cosmological constant. We compare equations and solutions in several different gauge conditions available in both methods. In the PN method we have perturbation equations for density, velocity, and gravitational potential independently of the gauge condition to 1PN order. However, correspondences with these 1PN equations are available only in certain gauge conditions in the perturbation theory. Equations of perturbed velocity and the perturbed gravitational potential in the zero-shear gauge exactly coincide with the Newtonian equations, which remain valid even to 1PN order (the same is true for perturbed velocity identified in the comoving gauge), and equations of perturbed density in the zero-shear gauge and the uniform-expansion gauge coincide to 1PN order. We identify other correspondences available in different gauge conditions of the perturbation theory.
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