Thermal relic abundances of particles with velocity-dependent interactions

We reexamine the evolution of thermal relic particle abundances for the case where the interaction rate depends on the particle velocities. For the case of Sommerfeld enhancement, we show that the standard analytic approximation, modified in a straightforward way, provides an estimate of the relic p...

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Bibliographic Details
Published in:Physics letters. B 2010-04, Vol.687 (4-5), p.275-279
Main Authors: Dent, James B., Dutta, Sourish, Scherrer, Robert J.
Format: Article
Language:English
Subjects:
Abundance
Approximation
Cosmology
Cut off
Dark matter
Decoupling
Early universe
Elementary particles
Error analysis
Evolution
Exact sciences and technology
Mathematical analysis
Nuclear physics
Physics
Sommerfeld enchancement
The physics of elementary particles and fields
Thermal relic abundances
Velocity-dependent interactions
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Summary:We reexamine the evolution of thermal relic particle abundances for the case where the interaction rate depends on the particle velocities. For the case of Sommerfeld enhancement, we show that the standard analytic approximation, modified in a straightforward way, provides an estimate of the relic particle abundance that is accurate to within 10% (in comparison to
ISSN:0370-2693
1873-2445
DOI:10.1016/j.physletb.2010.03.018