Structure formation, backreaction and weak gravitational fields
نویسندگان
چکیده
منابع مشابه
Structure Formation, Backreaction and Weak Gravitational Fields
There is an ongoing debate in the literature as to whether the effects of averaging out inhomogeneities (“backreaction”) in Cosmology can be large enough to account for the acceleration of the scale factor in the FLRW models. In particular, some simple models of structure formation studied in the literature seem to indicate that this is indeed possible, and it has also been suggested that the p...
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There is an ongoing debate in the literature concerning the effects of averaging out inhomogeneities (“backreaction”) in cosmology. In particular, some simple models of structure formation studied in the literature seem to indicate that the backreaction can play a significant role at late times, and it has also been suggested that the standard perturbed FLRW framework is no longer a good approx...
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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 nonrelativistc matter, as well as several exact solutions describing inhomogeneous and anisotropic expanding universes. We ...
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We develop a new formalism for the treatment of gravitational backreaction in the cosmological setting. The approach is inspired by projective techniques in non-equilibrium statistical mechanics. We employ group-averaging with respect to the action of the isotropy group of homogeneous and isotropic spacetimes (rather than spatial averaging), in order to define effective FRW variables for a gene...
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ژورنال
عنوان ژورنال: Journal of Cosmology and Astroparticle Physics
سال: 2008
ISSN: 1475-7516
DOI: 10.1088/1475-7516/2008/03/023