Does the fraction of dark matter diminish with early dark energy?

Abstract

In pre-recombination early dark energy (EDE) resolutions of the Hubble tension, the rise of Hubble constant value $H_0$ is usually accompanied with the exacerbation of so-called $S_8$ tension. Inspired by the swampland conjecture, we investigate what if a fraction $f_{\ast }$ of dark matter is coupled to EDE, $m_{cdm}\sim \exp (-c\frac{|\Delta {\varphi }_{ede}|}{M_{pl}})$ with $c\sim \mathcal{O}(1)$. We perform the MCMC analysis for the relevant EDE models with PlanckCMB, BAO, Pantheon and SH0ES dataset, as well as DES-Y1 data, and find that such a fraction helps to alleviate the $S_8$ tension. However, though $c\gtrsim 0.1$ is allowed for a very small $f_{\ast }$, which suggests that a small fraction of dark matter has ever faded with EDE, $c\sim 0$ is also consistent.

arXiv comment24 pages,8 figures

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