Dark energy view of inflation

Ilić, Stéphane, Kunz, Martin, Liddle, Andrew R and Frieman, Joshua A (2010) Dark energy view of inflation. Physical Review D, 81 (10). ISSN 1550-7998

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Abstract

Traditionally, inflationary models are analyzed in terms of parameters such as the scalar spectral index n(s) and the tensor to scalar ratio r, while dark energy models are studied in terms of the equation of state parameter w. Motivated by the fact that both deal with periods of accelerated expansion, we study the evolution of w during inflation, in order to derive observational constraints on its value during an earlier epoch likely dominated by a dynamic form of dark energy. We find that the cosmic microwave background and large-scale structure data is consistent with w(inflation) = -1 and provides an upper limit of 1 + w less than or similar to 0.02. Nonetheless, an exact de Sitter expansion with a constant w = -1 is disfavored since this would result in n(s) = 1.

Item Type: Article
Additional Information: Article Number: 103502
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Depositing User: Andrew Liddle
Date Deposited: 06 Feb 2012 21:27
Last Modified: 24 Mar 2017 16:22
URI: http://sro.sussex.ac.uk/id/eprint/31289

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