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Global dynamics and asymptotics for monomial scalar field potentials and perfect fluids
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics.
2015 (English)In: Classical and quantum gravity, ISSN 0264-9381, E-ISSN 1361-6382, Vol. 32, no 14Article in journal (Refereed) PublishedText
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. 

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2015. Vol. 32, no 14
Keyword [en]
riedmann–Lemaître–Robertson–Walker cosmology, monomial potential
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Other Physics Topics
Research subject
URN: urn:nbn:se:kau:diva-42371DOI: 10.1088/0264-9381/32/14/145005ScopusID: 2-s2.0-84935462852OAI: diva2:933742
Available from: 2016-06-07 Created: 2016-05-23 Last updated: 2016-06-07Bibliographically approved

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Uggla, Claes
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