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001     485080
005     20250715175857.0
024 7 _ |a 10.1088/1361-6382/ac8c18
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024 7 _ |a Cicoli:2021itv
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024 7 _ |a inspire:1893589
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024 7 _ |a 0264-9381
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024 7 _ |a 1361-6382
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024 7 _ |a arXiv:2107.12392
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041 _ _ |a English
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088 _ _ |a arXiv:2107.12392
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088 _ _ |a DESY-21-113
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100 1 _ |a Cicoli, Michele
|0 P:(DE-H253)PIP1010796
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245 _ _ |a A fake instability in string inflation
260 _ _ |a Bristol
|c 2022
|b IOP Publ.
336 7 _ |a article
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336 7 _ |a Journal Article
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336 7 _ |a ARTICLE
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336 7 _ |a Journal Article
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500 _ _ |a 5 pages + references, 3 figures Waiting for fulltext
520 _ _ |a 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.
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650 _ 7 |a isocurvature: perturbation
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650 _ 7 |a perturbation: decay
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650 _ 7 |a entropy: perturbation
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650 _ 7 |a inflation: model
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650 _ 7 |a fibre
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650 _ 7 |a stability
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650 _ 7 |a axion
|2 INSPIRE
650 _ 7 |a inflaton
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650 _ 7 |a string
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650 _ 7 |a tachyon
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650 _ 7 |a curvature
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650 _ 7 |a background
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650 _ 7 |a trajectory
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650 _ 7 |a Kaehler
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650 _ 7 |a string inflation
|2 autogen
650 _ 7 |a string cosmology
|2 autogen
650 _ 7 |a isocurvature perturbations
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693 _ _ |0 EXP:(DE-MLZ)NOSPEC-20140101
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700 1 _ |a Guidetti, Veronica
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700 1 _ |a Muia, Francesco
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700 1 _ |a Pedro, Francisco G.
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700 1 _ |a Vacca, Gian Paolo
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773 _ _ |a 10.1088/1361-6382/ac8c18
|g Vol. 39, no. 19, p. 195012 -
|0 PERI:(DE-600)1473117-4
|n 19
|p 195012
|t Classical and quantum gravity
|v 39
|y 2022
|x 0264-9381
787 0 _ |a Guidetti, Veronica et.al.
|d 2021
|i IsParent
|0 PUBDB-2021-03071
|r DESY-21-113 ; arXiv:2107.12392
|t A Fake Instability in String Inflation
856 4 _ |u https://bib-pubdb1.desy.de/record/485080/files/Cicoli_2022_Class._Quantum_Grav._39_195012.pdf
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