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Dynamical analysis of R1/square R-2 cosmology: Impact of initial conditions and constraints from supernovae
Stockholm University, Nordic Institute for Theoretical Physics (Nordita).
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Number of Authors: 5
2016 (English)In: Physical Review D, ISSN 2470-0010, Vol. 94, no 4, 043531Article in journal (Refereed) Published
Abstract [en]

We discuss the cosmological implications of the R square R-2 nonlocal modification to standard gravity. We relax the assumption of special initial conditions in the local formulation of the theory, perform a full phase-space analysis of the system, and show that the late-time cosmology of the model exhibits two distinct evolution paths, on which a large range of values for the present equation of state can be reached. We then compare the general solutions to supernovae data and place constraints on the parameters of the model. In particular, we find that the mass parameter of the theory should be smaller than 1.2 in Hubble units.

Place, publisher, year, edition, pages
2016. Vol. 94, no 4, 043531
National Category
Physical Sciences
URN: urn:nbn:se:su:diva-134412DOI: 10.1103/PhysRevD.94.043531ISI: 000381895400002OAI: diva2:1039556
Available from: 2016-10-24 Created: 2016-10-06 Last updated: 2017-01-11Bibliographically approved

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Koivisto, Tomi S.
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Nordic Institute for Theoretical Physics (Nordita)
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