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Non -standard cosmological scenarios, Sommerfeld enhancement and asymmetric dark matter
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DOI：10.1016/j.nuclphysb.2026.117570.png)
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Abstract
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We discuss the relic density of asymmetric dark matter with long-range interactions in non-standard cosmological scenarios, where the cosmic expansion rate is modified by the extra energy content and the cross section is revised by long-ranged potential non-perturbative effect.The Sommerfeld enhancement leads to an underabundant relic density of asymmetric dark matter, while an enhanced cosmic expansion rate raises the relic density by causing the decoupling from thermal equilibrium to occur earlier. However, the mixed effect of modified cosmic expansion rate and the Sommerfeld enhancement on asymmetric dark matter density evolution becomes complicated and interesting, due to their opposing affects on the relic density and contrary strength developments as the temperature fell. We analyze the mixed effects on asymmetric dark matter thermal equilibrium decoupling and relic freeze-out process. Furthermore, we find constraints on the parameter spaces using the present observational data such as Planck and Fermi-LAT data.
Keywords:
Dark matter
Non-standard Cosmology
Sommerfeld Effect
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