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"Non-equilibrium effects in the evolution of Dark Matter"
(University of Oslo)
Joint CPT-CPPM Seminar
Among viable dark matter (DM) production mechanisms the thermal freeze-out stands out as the most natural and best motivated one. In the usual theoretical approach to the determination of thermal relic abundance the assumption of local thermal equilibrium is made. But is this assumption always justified? In this talk I will first introduce the topic and then address this question. I will discuss more accurate treatments, one relying on the inclusion of higher moments of the Boltzmann equation and the second on solving the evolution of the phase space distribution function fully numerically. Examples where such improved treatment is necessary will be discussed, including DM annihilation below threshold, semi- or resonant annihilation.
Keywords: Dark Matter Phenomenology, relic density, Boltzmann equation