Preprint

PUBDB-2021-03071

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png A Fake Instability in String Inflation

Guidetti, V. (Corresponding author)DESY* ; Cicoli, M. (Corresponding author) ; Vacca, G. P. (Corresponding author)INFN* ; Pedro, F. (Corresponding author) ; Muia, F. (Corresponding author)

2021

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Please use a persistent id in citations: doi:10.3204/PUBDB-2021-03071

Report No.: DESY-21-113; arXiv:2107.12392

Abstract: In type IIB Fibre Inflation models the inflaton is a Kaehler modulus which is kinetically coupled to the corresponding axion. In this setup the curvature of the field space induces tachyonic isocurvature perturbations normal to the background inflationary trajectory. However we argue that the associated instability is unphysical since it is due to the use of ill-defined entropy variables. In fact, upon using the correct relative entropy perturbation, we show that in Fibre Inflation axionic isocurvature perturbations decay during inflation and the dynamics is essentially single-field.

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Contributing Institute(s):

1. Theorie-Gruppe (T)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF4-611) (POF4-611)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2021

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Database coverage:
; Published

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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Journal Article Cicoli, M. (Corresponding author)DESY* ; Guidetti, V.DESY* ; Muia, F.DESY* ; Pedro, F. G.DESY* ; Vacca, G. P.
A fake instability in string inflation
Classical and quantum gravity 39(19), 195012 (2022) [10.1088/1361-6382/ac8c18]2022     Files  Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

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