Abstract
We study the cosmological evolution of a FLRW universe dominated by the energy density of moduli close to asymptotic regions of moduli space. Due to the structure of the \(\mathcal{N}\) = 1 SUGRA kinetic term, a saxion and an axion residing in the same chiral multiplet are (universally) coupled even if the latter is a flat direction of the potential, resulting in non-trivial dynamics. We generalise known results in the literature to the case of multiple moduli, showing the existence of various “tracker” attractor solutions where the relative energy densities of many components (axions included) stay in a fixed ratio throughout the evolution. We conclude with some phenomenological applications, relevant for both the early and late universe.
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Acknowledgments
We are particularly grateful to Fien Apers, José Calderón-Infante, Joe Conlon, Ed Copeland, Thomas Grimm, Stefano Lanza, Flavio Tonioni and Damian van de Heisteeg for very valuable discussions, and comments on the manuscript. We would also like to thank the anonymous referee for many useful comments. The research of FR is supported by the Dutch Research Council (NWO) via a Start-Up grant and a Vici grant.
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Revello, F. Attractive (s)axions: cosmological trackers at the boundary of moduli space. J. High Energ. Phys. 2024, 37 (2024). https://doi.org/10.1007/JHEP05(2024)037
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DOI: https://doi.org/10.1007/JHEP05(2024)037