Temperature Power Law of Equilibrium Heavy Particle Density

Details Temperature Power Law of Equilibrium Heavy Particle Density Temperature Power Law of Equilibrium Heavy Particle Density

1999-10-19

arxiv.org/abs/hep-ph/9910393v1

Phys.Rev. D61 (2000) 123508

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, LATEX file with 6 PS figures

Scientific paper

10.1103/PhysRevD.61.123508

A standard calculation of the energy density of heavy stable particles that may pair-annihilate into light particles making up thermal medium is performed to second order of coupling, using the technique of thermal field theory. At very low temperatures a power law of temperature is derived for the energy density of the heavy particle. This is in sharp contrast to the exponentially suppressed contribution estimated from the ideal gas distribution function. The result supports a previous dynamical calculation based on the Hartree approximation, and implies that the relic abundance of dark matter particles is enhanced compared to that based on the Boltzmann equation.

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