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Mass varying dark matter and its cosmological signature

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arxiv 2303.17947 v2 pith:2M7JFFQA submitted 2023-03-31 astro-ph.CO hep-ph

classification astro-ph.COhep-ph
keywords darkmattermasschangescosmologicalmodelpowerspectrum
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abstract

Nontrivial dark sector physics continues to be an interesting avenue in our quest to the nature of dark matter. In this paper, we study the cosmological signatures of mass-varying dark matter where its mass changes from zero to a nonzero value in the early Universe. We compute the changes in various observables, such as, the linear matter power spectrum and the cosmic microwave background anisotropy power spectrum. We explain the origin of the effects and point out a qualitative similarity between this model and a warm dark matter cosmology with no sudden mass transition. Finally, we do a simple analytical study to estimate the constraint on the parameters of this model from the Lyman-$\alpha$ forest data.

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Cited by 1 Pith paper

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  1. Cosmological impact of $\nu$DM interactions enhanced in narrow redshift ranges

    astro-ph.CO 2025-05 conditional novelty 6.0 of 10

    A redshift-limited dark matter-neutrino interaction reproduces the observed preference for non-zero coupling in CMB and cosmic shear data and evades small-scale structure bounds.

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