On thermal corrections to near-threshold annihilation

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 p...

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Bibliographic Details
Published in:Journal of cosmology and astroparticle physics 2017-01, Vol.2017 (1), p.13-13
Main Authors: Kim, Seyong, Laine, M.
Format: Article
Language:English
Subjects:
ANNIHILATION
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
BOSON-EXCHANGE MODELS
BOSONS
BOUND STATE
CORRECTIONS
GLUINOS
MASS
MIXING ANGLE
NONLUMINOUS MATTER
PLASMA
RELATIVISTIC RANGE
SCATTERING
SPECTRA
SPIN
STRONG INTERACTIONS
TEV RANGE
UNIVERSE
VISIBLE RADIATION
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Summary: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.
ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2017/01/013