Non-relativistic susceptibility and a dark matter application

Biondini, Simone; Kim, Se Yong; Laine, Mikko Sakari (2019). Non-relativistic susceptibility and a dark matter application. Journal of cosmology and astroparticle physics, 2019(10), 078-078. Institute of Physics Publishing IOP 10.1088/1475-7516/2019/10/078

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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 situ- ation 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.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)
08 Faculty of Science > Institute of Theoretical Physics

UniBE Contributor:

Biondini, Simone; Kim, Se Yong and Laine, Mikko Sakari

Subjects:

500 Science > 530 Physics

ISSN:

1475-7516

Publisher:

Institute of Physics Publishing IOP

Language:

English

Submitter:

Esther Fiechter

Date Deposited:

29 Jan 2020 16:13

Last Modified:

02 Feb 2020 02:54

Publisher DOI:

10.1088/1475-7516/2019/10/078

ArXiv ID:

1908.07541

BORIS DOI:

10.7892/boris.138896

URI:

https://boris.unibe.ch/id/eprint/138896

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