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Friedmann–Lemaître–Robertson–Walker metric
About: Friedmann–Lemaître–Robertson–Walker metric is a research topic. Over the lifetime, 4113 publications have been published within this topic receiving 87752 citations. The topic is also known as: FLRW metric.
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TL;DR: In this paper, a semi-phenomenological version of D-brane cosmology is proposed, where a single (3 + 1)-dimensional D-Brane is located on the boundary of a single bulk (4+1)-dimensional region.
94 citations
TL;DR: In this article, the authors study FRW bulk viscous cosmology in the presence of modified Chaplygin gas and obtain time-dependent energy density for the special case of flat space.
Abstract: In this paper we study FRW bulk viscous cosmology in presence of modified Chaplygin gas. We write modified Friedmann equations due to bulk viscosity and Chaplygin gas and obtain time-dependent energy density for the special case of flat space.
93 citations
93 citations
TL;DR: In this article, a Bianchi type I metric is considered and a solution in which the cosmological term varies inversely with the square of time is found, which is the case of the flat Friedmann-Lemaitre-Robertson-Walker (flrw) models discussed recently.
Abstract: Einstein's equations with variableG and A scalars are considered for a Bianchi type I metric. A solution is found in which the cosmological term varies inversely with the square of time. As in the case of the flat Friedmann-Lemaitre-Robertson-Walker (flrw) models discussed recently, there is then no dimensional constant associated with A. However, it is shown that the time behaviour of Bianchi type I inflationary solutions cannot be of the pure de Sitter type. This shows that if the flat FLRW inflationary solutions previously considered are perturbed by the introduction of Bianchi type I anisotropy, then the time evolution may be perturbed from the pure exponential form.
92 citations
TL;DR: In this paper, a renormalization group improved effective action beyond one-loop approximation is derived for higher-derivative quantum gravity, and the quantum-corrected FRW equations are analyzed.
Abstract: We consider higher-derivative quantum gravity where renormalization group improved effective action beyond one-loop approximation is derived. Using this effective action, the quantum-corrected FRW equations are analyzed. De Sitter universe solution is found. It is demonstrated that such de Sitter inflationary universe is instable. The slow-roll inflationary parameters are calculated. The contribution of renormalization group improved Gauss-Bonnet term to quantum-corrected FRW equations as well as to instability of de Sitter universe is estimated. It is demonstrated that in this case the spectral index and tensor-to-scalar ratio are consistent with Planck data.
91 citations