The origin of the accelerated expansion of the Universe is still unclear and new physics is needed on cosmological scales. We propose and test a novel interpretation of dark energy as originated by an elastic strain due to a cosmic defect in an otherwise Euclidean space-time. The strain modifies the expansion history of the universe. This new effective contribution tracks radiation at early times and mimics a cosmological constant at late times. The theory is tested against observations, from nucleosynthesis to the cosmic microwave background and formation and evolution of large-scale structure to supernovae. Data are very well reproduced with Lame parameters of the order of 10(-52) m(-2).

Dark energy as an elastic strain fluid

SERENO, MAURO;
2013

Abstract

The origin of the accelerated expansion of the Universe is still unclear and new physics is needed on cosmological scales. We propose and test a novel interpretation of dark energy as originated by an elastic strain due to a cosmic defect in an otherwise Euclidean space-time. The strain modifies the expansion history of the universe. This new effective contribution tracks radiation at early times and mimics a cosmological constant at late times. The theory is tested against observations, from nucleosynthesis to the cosmic microwave background and formation and evolution of large-scale structure to supernovae. Data are very well reproduced with Lame parameters of the order of 10(-52) m(-2).
2013
N. Radicella;M. Sereno;A. Tartaglia
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/398938
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