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Scalar field deformations of Lambda CDM cosmology
Univ Lisbon, Inst Super Tecn, Ctr Math Anal Geometry & Dynam Syst, P-1049001 Lisbon, Portugal..
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics.
2015 (English)In: Physical Review D, ISSN 1550-7998, E-ISSN 1550-2368, Vol. 92, no 10, 103502Article in journal (Refereed) PublishedText
Abstract [en]

This paper treats nonrelativistic matter and a scalar field phi with a monotonically decreasing potential minimally coupled to gravity in flat Friedmann-Lemaitre-Robertson-Walker cosmology. The field equations are reformulated as a three-dimensional dynamical system on an extended compact state space, complemented with cosmographic diagrams. A dynamical systems analysis provides global dynamical results describing possible asymptotic behavior. It is shown that one should impose global and asymptotic bounds on lambda = -V-1 dV/d phi to obtain viable cosmological models that continuously deform Lambda CDM cosmology. In particular we introduce a regularized inverse power-law potential as a simple specific example.

Place, publisher, year, edition, pages
2015. Vol. 92, no 10, 103502
Keyword [en]
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Physical Sciences
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URN: urn:nbn:se:kau:diva-40685DOI: 10.1103/PhysRevD.92.103502ISI: 000364020800003OAI: diva2:906607
Available from: 2016-02-24 Created: 2016-02-24 Last updated: 2016-02-24Bibliographically approved

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Uggla, Claes
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