Journal Article

PUBDB-2022-06549

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png A fake instability in string inflation

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

2022
IOP Publ. Bristol

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Please use a persistent id in citations: doi:10.1088/1361-6382/ac8c18

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

Abstract: In type IIB fibre inflation models the inflation is a Kähler 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.

Keyword(s): isocurvature: perturbation ; perturbation: decay ; entropy: perturbation ; inflation: model ; fibre ; stability ; axion ; inflaton ; string ; tachyon ; curvature ; background ; trajectory ; Kaehler ; string inflation ; string cosmology ; isocurvature perturbations

Note: 5 pages + references, 3 figures Waiting for fulltext

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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 2022

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Database coverage:
; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; National-Konsortium ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Preprint Guidetti, V. (Corresponding author)DESY* ; Cicoli, M. (Corresponding author) ; Vacca, G. P. (Corresponding author)INFN* ; Pedro, F. (Corresponding author) ; Muia, F. (Corresponding author)
A Fake Instability in String Inflation
[10.3204/PUBDB-2021-03071]     Files  Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

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