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Energy Spectrum of Thermalizing High Energy Decay Products in the Early Universe
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abstract
We revisit the Boltzmann equation governing the spectrum of energetic particles originating from the decay of massive progenitors during the process of thermalization. We assume that these decays occur when the background temperature $T$ is much less than the mass $M$ of the progenitor. We pay special attention to the IR cutoff provided by the thermal bath, and include the suppression resulting from the interference of multiple scattering reactions (LPM effect). We solve the resulting integral equation numerically, and construct an accurate analytical fit of the solutions.
Forward citations
Cited by 2 Pith papers
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Revisiting the sphaleron and axion production rates in QCD at high temperatures
Lattice simulations give sphaleron rates in hot QCD plasmas and show axion production rates deviate from perturbative predictions at high temperatures.
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Aspects of Gravitational Portals and Freeze-in during Reheating
During reheating, freeze-in from the gravitationally produced radiation bath can dominate the dark matter relic density for DM masses above the reheating temperature, with k- and n-dependent constraints.
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