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Dark energy view of inflation

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journal contribution
posted on 2023-06-08, 10:02 authored by Stéphane Ilic, Martin Kunz, Andrew R Liddle, Joshua A Frieman
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.

History

Publication status

  • Published

File Version

  • Published version

Journal

Physical Review D

ISSN

1550-7998

Publisher

American Physical Society

Issue

10

Volume

81

Department affiliated with

  • Physics and Astronomy Publications

Notes

Article Number: 103502

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2012-02-06

First Open Access (FOA) Date

2016-03-22

First Compliant Deposit (FCD) Date

2016-11-10

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