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arXiv · 2503.14904

Axion Stabilization in Modular Cosmology

John Joseph Carrasco·Renata Kallosh·Andrei Linde·Diederik Roest
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Abstract

The $SL(2,\mathbb{Z})$ invariant $\alpha$-attractor models have plateau potentials with respect to the inflaton and axion fields. The potential in the axion direction is almost exactly flat during inflation, hence, the axion field remains nearly massless. In this paper, we develop a generalized class of such models, where the $SL(2,\mathbb{Z})$ symmetry is preserved, but the axion acquires a large mass and becomes strongly stabilized during inflation, which eliminates isocurvature perturbations in this scenario. Inflation in such two-field models occurs as in the single-field $\alpha$-attractors and leads to the same cosmological predictions.

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John Joseph Carrasco, Renata Kallosh, Andrei Linde, Diederik Roest. 2025-03-19. Axion Stabilization in Modular Cosmology. https://arxiv.org/abs/2503.14904

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