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279. Sommerfeld enhancement
This is a brief guest blog post by Roberto Iengo from SISSA (Trieste) who is going to explain us what is Sommerfeld enhancement. Dmitry.
Consider two particles which collide and then undergo some reaction as the result of the collision. An interesting case is the annihilation of two dark matter particles, resulting in the emission of gamma rays or electron positron pairs which could be a long-awaited signal on the dark matter nature. The rate for this process is the product of the cross-section times the incident flux. In the case of the dark matter particles the estimated rate seems to be too low to support the above interpretation of the events which have been observed in some astroparticle experiments.
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