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Lyth bound of inflation with a tilt

Juan Garcia-Bellido, Diederik Roest, Marco Scalisi, Ivonne Zavala, Ivonne Zavala Carrasco Orcid Logo

Physical Review D, Volume: 90, Issue: 12

Swansea University Author: Ivonne Zavala Carrasco Orcid Logo

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DOI (Published version): 10.1103/PhysRevD.90.123539

Abstract

We provide strong evidence for universality of the inflationary field range: given an accurate measurement of (ns,r), one can infer Δϕ in a model-independent way in the sub-Planckian regime for a range of universality classes of inflationary models. Both the tensor-to-scalar ratio as well as the spe...

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Published in: Physical Review D
Published: 2014
URI: https://cronfa.swan.ac.uk/Record/cronfa21629
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Abstract: We provide strong evidence for universality of the inflationary field range: given an accurate measurement of (ns,r), one can infer Δϕ in a model-independent way in the sub-Planckian regime for a range of universality classes of inflationary models. Both the tensor-to-scalar ratio as well as the spectral tilt are essential for the field range. Given the Planck constraints on ns, the Lyth bound is strengthened by two orders of magnitude: whereas the original bound gives a sub-Planckian field range for r≲2⋅10−3, we find that n=0.96 brings this down to r≲2⋅10−5.
College: College of Science
Issue: 12