000485080 001__ 485080 000485080 005__ 20250715175857.0 000485080 0247_ $$2doi$$a10.1088/1361-6382/ac8c18 000485080 0247_ $$2INSPIRETeX$$aCicoli:2021itv 000485080 0247_ $$2inspire$$ainspire:1893589 000485080 0247_ $$2ISSN$$a0264-9381 000485080 0247_ $$2ISSN$$a1361-6382 000485080 0247_ $$2arXiv$$aarXiv:2107.12392 000485080 0247_ $$2altmetric$$aaltmetric:110550001 000485080 0247_ $$2WOS$$aWOS:000852143900001 000485080 0247_ $$2openalex$$aopenalex:W3184327186 000485080 037__ $$aPUBDB-2022-06549 000485080 041__ $$aEnglish 000485080 082__ $$a530 000485080 088__ $$2arXiv$$aarXiv:2107.12392 000485080 088__ $$2DESY$$aDESY-21-113 000485080 1001_ $$0P:(DE-H253)PIP1010796$$aCicoli, Michele$$b0$$eCorresponding author$$udesy 000485080 245__ $$aA fake instability in string inflation 000485080 260__ $$aBristol$$bIOP Publ.$$c2022 000485080 3367_ $$2DRIVER$$aarticle 000485080 3367_ $$2DataCite$$aOutput Types/Journal article 000485080 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article$$bjournal$$mjournal$$s1668503018_26670 000485080 3367_ $$2BibTeX$$aARTICLE 000485080 3367_ $$2ORCID$$aJOURNAL_ARTICLE 000485080 3367_ $$00$$2EndNote$$aJournal Article 000485080 500__ $$a5 pages + references, 3 figures Waiting for fulltext 000485080 520__ $$aIn 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. 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