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Perturbations of the Lambda-CDM model in a dynamical systems perspective
Univ Lisbon, Portugal..
Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Institutionen för ingenjörsvetenskap och fysik (from 2013).ORCID-id: 0000-0002-0906-8808
Univ Waterloo, Canada..
2019 (engelsk)Inngår i: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, E-ISSN 1475-7516, nr 9, artikkel-id 045Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The observational success and simplicity of the ACDM model, and the explicit analytic perturbations thereof, set the standard for any alternative cosmology. It therefore serves as a comparison ground and as a test case for methods which can be extended and applied to other cosmological models. In this paper we introduce dynamical systems and methods to describe linear scalar and tensor perturbations of the ACDM model, which serve as pedagogical examples that show the global illustrative powers of dynamical systems in the context of cosmological perturbations. We also study the asymptotic properties of the shear and Weyl tensors and discuss the validity of the perturbations as approximations to the Einstein field equations. Furthermore, we give a new approximation for the linear growth 5 rate, f (z) = d ln delta/d ln a = Omega(6/11)(m) - 1/70(1-Omega(m))(5/2), where z is the cosmological redshift, Omega(m) = Omega(m)(z), while a is the background scale factor, and show that it is much more accurate than the previous ones in the literature.

sted, utgiver, år, opplag, sider
Bristol, UK: IOP PUBLISHING LTD , 2019. nr 9, artikkel-id 045
Emneord [en]
cosmological perturbation theory, dark energy theory
HSV kategori
Forskningsprogram
Fysik
Identifikatorer
URN: urn:nbn:se:kau:diva-75203DOI: 10.1088/1475-7516/2019/09/045ISI: 000487557600001OAI: oai:DiVA.org:kau-75203DiVA, id: diva2:1359826
Tilgjengelig fra: 2019-10-10 Laget: 2019-10-10 Sist oppdatert: 2019-10-25bibliografisk kontrollert

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