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2019

$H_0$ Tension, Swampland Conjectures and the Epoch of Fading Dark Matter

Agrawal, Prateek, Obied, Georges, Vafa, Cumrun

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Motivated by the swampland dS conjecture, we consider a rolling scalar field as the source of dark energy.

Furthermore, the swampland distance conjecture suggests that the rolling field will lead at late times to an exponentially light tower of states.
Identifying this tower as residing in the dark sector suggests a natural coupling of the scalar field to the dark matter, leading to a continually reducing dark matter mass as the scalar field rolls in the recent cosmological epoch.
The exponent in the distance conjecture, $\tilde{c}$, is expected to be an $\mathcal{O}(1)$ number.

$H_0$ Tension, Swampland Conjectures and the Epoch of Fading Dark Matter · Around

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