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Simple expressions for second order density perturbations in standard cosmology
Karlstads universitet, Fakulteten för teknik- och naturvetenskap. Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Institutionen för ingenjörsvetenskap och fysik. (Fysik)ORCID-id: 0000-0002-0906-8808
University of Waterloo.
2014 (engelsk)Inngår i: Classical and quantum gravity, ISSN 0264-9381, E-ISSN 1361-6382, Vol. 31, nr 10, s. 105008-Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

In this paper we present four simple expressions for the relativistic first and second order fractional density perturbations for ΛCDM cosmologies in different gauges: the Poisson, uniform curvature, total matter and synchronous gauges. A distinctive feature of our approach is the use of a canonical set of quadratic differential expressions involving an arbitrary spatial function, the so-called comoving curvature perturbation, to describe the spatial dependence, which enables us to unify, simplify and extend previous seemingly disparate results. The simple structure of the expressions makes the evolution of the density perturbations completely transparent and clearly displays the effect of the cosmological constant on the dynamics, namely that it stabilizes the perturbations. We expect that the results will be useful in applications, for example, studying the effects of primordial non-Gaussianity on the large scale structure of the universe.

sted, utgiver, år, opplag, sider
Institute of Physics (IOP), 2014. Vol. 31, nr 10, s. 105008-
Emneord [en]
Cosmology
HSV kategori
Forskningsprogram
Fysik
Identifikatorer
URN: urn:nbn:se:kau:diva-33953DOI: 10.1088/0264-9381/31/10/105008ISI: 000336092700009OAI: oai:DiVA.org:kau-33953DiVA, id: diva2:752180
Tilgjengelig fra: 2014-10-02 Laget: 2014-10-02 Sist oppdatert: 2017-12-05bibliografisk kontrollert

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