Scalar field deformations of Lambda CDM cosmology
2015 (English)In: Physical Review D, ISSN 1550-7998, E-ISSN 1550-2368, Vol. 92, no 10, 103502Article in journal (Refereed) PublishedText
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
SCALING SOLUTIONS; POTENTIALS
Research subject Physics
IdentifiersURN: urn:nbn:se:kau:diva-40685DOI: 10.1103/PhysRevD.92.103502ISI: 000364020800003OAI: oai:DiVA.org:kau-40685DiVA: diva2:906607