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Geometrical Destabilisation of Ultra-Light Axions in String Inflation

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arxiv 1903.01497 v1 pith:UGTR5U2P submitted 2019-03-04 hep-th astro-ph.CO

Michele Cicoli , Veronica Guidetti , Francisco G. Pedro This is my paper · ORCID
classification hep-thastro-ph.CO
keywords inflationanalysisaxionsdestabilisationevolutionfibregeometricalisocurvature
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We perform a detailed analytical and numerical analysis of the multi-field evolution of Fibre Inflation and show that, regardless of the microscopic realisation of the model, the mass-squared of one of the two ultra-light axions becomes always negative during inflation. This implies that the corresponding isocurvature perturbations experience a potential geometrical destabilisation which seems to bring the system away from the perturbative regime. Therefore we conclude that a full understanding of the inflationary evolution of Fibre Inflation can be achieved only via a non-perturbative analysis where the backreaction of tachyonic isocurvature perturbations is properly taken into account.

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Cited by 5 Pith papers

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  3. Spectator Axions in String Inflation and Primordial Black Holes

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  4. Ultra slow-turn inflation

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  5. Propagation of Gravitational Waves in Chern-Simons Axion Einstein Gravity

    gr-qc 2019-09 conditional novelty 4.0 of 10

    In Chern-Simons axion Einstein gravity, right- and left-handed gravitational wave polarizations obey different dispersion relations, and high-frequency damping is four times stronger than in general relativity.

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