Abstract
Early Dark Energy (EDE) is a promising model to resolve the Hubble Tension, that, informed by Cosmic Microwave Background data, features a generalization of the potential energy usually associated with axion-like particles. We develop realizations of EDE in type IIB string theory with the EDE field identified as either a C4 or C2 axion and with full closed string moduli stabilization within the framework of either KKLT or the Large Volume Scenario. We explain how to achieve a natural hierarchy between the EDE energy scale and that of the other fields within a controlled effective field theory. We argue that the data-driven EDE energy scale and decay constant can be achieved without any tuning of the microscopic parameters for EDE fields that violate the weak gravity conjecture, while for states that respect the conjecture it is necessary to introduce a fine-tuning. This singles out as the most promising EDE candidates, amongst several working models, the C2 axions in LVS with 3 non-perturbative corrections to the superpotential generated by gaugino condensation on D7-branes with non-zero world-volume fluxes.
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Acknowledgments
We would like to thank Pramod Shukla and Roberto Valandro for useful conversations. We also thank Ralph Blumenhagen for relevant comments on a draft of this work. E.M. is supported in part by the National Sciences and Engineering Research Council of Canada via a Discovery Grant. This article is based upon work from the COST Action COSMIC WISPers CA21106, supported by COST (European Cooperation in Science and Technology).
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Cicoli, M., Licheri, M., Mahanta, R. et al. Early Dark Energy in Type IIB String Theory. J. High Energ. Phys. 2023, 52 (2023). https://doi.org/10.1007/JHEP06(2023)052
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DOI: https://doi.org/10.1007/JHEP06(2023)052