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Global dynamics and asymptotics for monomial scalar field potentials and perfect fluids
University of Lisbon, Portugal.
Free University Berlin, Germany.
Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Institutionen för ingenjörsvetenskap och fysik (from 2013).ORCID-id: 0000-0002-0906-8808
2015 (engelsk)Inngår i: Classical and quantum gravity, ISSN 0264-9381, E-ISSN 1361-6382, Vol. 32, nr 14, artikkel-id 145005Artikkel i tidsskrift (Fagfellevurdert) Published
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Abstract [en]

We consider a minimally coupled scalar field with a monomial potential and a perfect fluid in flat Friedmann-Lemaitre-Robertson-Walker cosmology. We apply local and global dynamical systems techniques to a new three-dimensional dynamical systems reformulation of the field equations on a compact state space. This leads to a visual global description of the solution space and asymptotic behavior. At late times we employ averaging techniques to prove statements about how the relationship between the equation of state of the fluid and the monomial exponent of the scalar field affects asymptotic source dominance and asymptotic manifest self-similarity breaking. We also situate the ’attractor’ solution in the three-dimensional state space and show that it corresponds to the one-dimensional unstable center manifold of a de Sitter fixed point, located on an unphysical boundary associated with the dynamics at early times. By deriving a center manifold expansion we obtain approximate expressions for the attractor solution. We subsequently improve the accuracy and range of the approximation by means of Pade approximants and compare with the slow-roll approximation. 

sted, utgiver, år, opplag, sider
Institute of Physics (IOP), 2015. Vol. 32, nr 14, artikkel-id 145005
Emneord [en]
riedmann–Lemaître–Robertson–Walker cosmology, monomial potential, cosmology, scalar field, dynamical systems, averaging, center manifold, slow-roll, Pade approximants
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URN: urn:nbn:se:kau:diva-42371DOI: 10.1088/0264-9381/32/14/145005ISI: 000357611500006Scopus ID: 2-s2.0-84935462852OAI: oai:DiVA.org:kau-42371DiVA, id: diva2:933742
Tilgjengelig fra: 2016-06-07 Laget: 2016-05-23 Sist oppdatert: 2019-07-10bibliografisk kontrollert

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