Abstract
Early dark energy has emerged as one of the more promising approaches to address the Hubble tension—the statistically significant disparity between measurements of the Hubble constant made using data from different epochs in cosmic history. However, the idea is not without its own set of challenges, both from the data, in the effects it has on other measurements, such as the large-scale structure tension, and from theoretical concerns such as technical naturalness and the introduction of a new coincidence problem in cosmology. In this brief note, delivered as an invited plenary lecture at the 16th Frontiers of Fundamental Physics conference, I discuss how some of the fine-tuning problems of early dark energy can be ameliorated by using couplings to other fields already present in cosmology, and for which the epoch of matter-radiation equality is already a special one. The resulting models—neutrino assisted early dark energy, and chameleon early dark energy—provide testable, theoretically robust implementations of this general idea. I will discuss the formulation and the cosmology of such approaches, including some constraints arising from both observational and theoretical considerations.
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Acknowledgements
I would like to thank the organizers of the 16th Frontiers of Fundamental Physics conference for the invitation to deliver this talk, and for curating such an interesting roster of other presentations. I am extremely grateful to Tanvi Karwal for providing comments on this manuscript. I would also like to thank Mariana Carrillo Gonzalez, Bhuvnesh Jain, Tanvi Karwal, Justin Khoury, Qiuyue Liang, Marco Raveri, and Jeremy Sakstein for thoroughly enjoyable collaborations. This work was supported in part by US Department of Energy (HEP) Award DE- SC0013528, and by NASA ATP grant 80NSSC18K0694.
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Trodden, M. (2024). Coupled Early Dark Energy. In: Aydiner, E., Sidharth, B.G., Michelini, M., Corda, C. (eds) Frontiers of Fundamental Physics FFP16. FFP 2022. Springer Proceedings in Physics, vol 392. Springer, Cham. https://doi.org/10.1007/978-3-031-38477-6_12
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