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arXiv · 1908.07541

Non-relativistic susceptibility and a dark matter application

S. Biondini·Seyong Kim·M. Laine
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Abstract

When thermal rate equations are derived for the evolution of slow variables, it is often practical to parametrize the right-hand side with chemical potentials. To close the system, the chemical potentials are subsequently re-expressed in terms of the slow variables, which involves the consideration of a "susceptibility". Here we study a non-relativistic situation in which chemical potentials are large compared with the temperature, as is relevant for late-time pair annihilations in dark matter freeze-out. An order-of-magnitude estimate and a lattice simulation are presented for a susceptibility dominated by bound states of stop-like mediators. After this "calibration", the formalism is applied to a model with Majorana singlet dark matter, confirming that masses up to the multi-TeV domain are viable in the presence of sufficient (though not beyond a limit) mass degeneracy in the dark sector.

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S. Biondini, Seyong Kim, M. Laine. 2019-08-20. Non-relativistic susceptibility and a dark matter application. https://doi.org/10.1088/1475-7516/2019/10/078

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