Efficient numerical integration of thermal interaction rates

Journal of High Energy Physics

M. Laine¹  G. Jackson² 

[1] AEC, Institute for Theoretical Physics, University of Bern, Sidlerstrasse 5, CH-3012, Bern, Switzerland;Institute for Nuclear Theory, Box 351550, University of Washington, 98195-1550, Seattle, WA, USA;

关键词: Thermal Field Theory;    Cosmology of Theories beyond the SM;    Quark-Gluon Plasma;   

DOI  :  10.1007/JHEP09(2021)125

来源: Springer

【 摘 要 】

In many problems in particle cosmology, interaction rates are dominated by 2 ↔ 2 scatterings, or get a substantial contribution from them, given that 1 ↔ 2 and 1 ↔ 3 reactions are phase-space suppressed. We describe an algorithm to represent, regularize, and evaluate a class of thermal 2 ↔ 2 and 1 ↔ 3 interaction rates for general momenta, masses, chemical potentials, and helicity projections. A key ingredient is an automated inclusion of virtual corrections to 1 ↔ 2 scatterings, which eliminate logarithmic and double-logarithmic IR divergences from the real 2 ↔ 2 and 1 ↔ 3 processes. We also review thermal and chemical potential induced contributions that require resummation if plasma particles are ultrarelativistic.

【 授权许可】

CC BY