On thermal corrections to near-threshold annihilation

Kim, Seyong; Laine, Mikko Sakari (2017). On thermal corrections to near-threshold annihilation. Journal of cosmology and astroparticle physics, 2017(01), 013-013. Institute of Physics Publishing IOP 10.1088/1475-7516/2017/01/013

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We consider non-relativistic ''dark'' particles interacting through gauge boson exchange. At finite temperature, gauge exchange is modified in many ways: virtual corrections lead to Debye screening; real corrections amount to frequent scatterings of the heavy particles on light plasma constituents; mixing angles change. In a certain temperature and energy range, these effects are of order unity. Taking them into account in a resummed form, we estimate the near-threshold spectrum of kinetically equilibrated annihilating TeV scale particles. Weakly bound states are shown to "melt" below freeze-out, whereas with attractive strong interactions, relevant e.g. for gluinos, bound states boost the annihilation rate by a factor 4 ... 80 with respect to the Sommerfeld estimate, thereby perhaps helping to avoid overclosure of the universe. Modestly non-degenerate dark sector masses and a way to combine the contributions of channels with different gauge and spin structures are also discussed.

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:

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 Jun 2017 15:08

Last Modified:

29 Jun 2017 15:08

Publisher DOI:

10.1088/1475-7516/2017/01/013

ArXiv ID:

1609.00474

BORIS DOI:

10.7892/boris.95468

URI:

https://boris.unibe.ch/id/eprint/95468

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