Revisiting the averaged annihilation rate of thermal relics at low temperature

We derive a low-temperature expansion of the formula to compute the average annihilation rate ⟨ σ v ⟩ for dark matter in Z 2 -symmetric models, both in the absence and the presence of mass degeneracy in the spectrum near the dark matter candidate. We show that the result obtained in the absence of m...

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Bibliographic Details
Published in:The European physical journal. C, Particles and fields Particles and fields, 2024-07, Vol.84 (7), p.751-14, Article 751
Main Authors: Arbey, A., Mahmoudi, F., Palmiotto, M.
Format: Article
Language:English
Subjects:
Astronomy
Astrophysics and Cosmology
Cold
Dark matter
Density
Elementary Particles
Hadrons
Heavy Ions
Low temperature
Measurement Science and Instrumentation
Nuclear Energy
Nuclear Physics
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
Regular Article - Theoretical Physics
String Theory
Temperature
Theoretical physics
Velocity
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Summary:We derive a low-temperature expansion of the formula to compute the average annihilation rate ⟨ σ v ⟩ for dark matter in Z 2 -symmetric models, both in the absence and the presence of mass degeneracy in the spectrum near the dark matter candidate. We show that the result obtained in the absence of mass degeneracy is compatible with the analytic formulae in the literature, and that it has a better numerical behaviour for low temperatures. We also provide as ancillary files two Wolfram Mathematica notebooks, which perform the two expansions at any order.
ISSN:1434-6052
1434-6044
1434-6052
DOI:10.1140/epjc/s10052-024-13108-7