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arXiv · 2509.25308

Thermal Damping of Neutrino-Coupled Scalar Dark Matter

Abhishek Banerjee·Ngan H. Nguyen·Erwin H. Tanin
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Abstract

We point out that ultralight scalar dark matter that modulates neutrino masses can be significantly thermal damped by cosmic neutrinos in the early universe. This dissipative effect arises as a backreaction from the neutrinos which are being driven slightly out of thermal equilibrium by the scalar. We estimate the rate of such thermal damping and explore its phenomenological implications. For a scalar that is produced early, we find that the effect of thermal damping results in a predictable final abundance largely insensitive to its initial condition while circumventing late time limits. This motivates a parameter-space line to target experimentally.

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Abhishek Banerjee, Ngan H. Nguyen, Erwin H. Tanin. 2025-09-29. Thermal Damping of Neutrino-Coupled Scalar Dark Matter. https://arxiv.org/abs/2509.25308

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