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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.$$c2022
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000485080 520__ $$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. 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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000485080 650_7 $$2autogen$$astring inflation
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000485080 7001_ $$0P:(DE-H253)PIP1087239$$aGuidetti, Veronica$$b1$$udesy
000485080 7001_ $$0P:(DE-H253)PIP1091885$$aMuia, Francesco$$b2$$udesy
000485080 7001_ $$0P:(DE-H253)PIP1018307$$aPedro, Francisco G.$$b3
000485080 7001_ $$0G.P.Vacca.1$$aVacca, Gian Paolo$$b4
000485080 773__ $$0PERI:(DE-600)1473117-4$$a10.1088/1361-6382/ac8c18$$gVol. 39, no. 19, p. 195012 -$$n19$$p195012$$tClassical and quantum gravity$$v39$$x0264-9381$$y2022
000485080 7870_ $$0PUBDB-2021-03071$$aGuidetti, Veronica et.al.$$d2021$$iIsParent$$rDESY-21-113 ; arXiv:2107.12392$$tA Fake Instability in String Inflation
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