Effective field theories for dark matter pairs in the early universe: cross sections and widths

S. Biondini, N. Brambilla, G. Qerimi, A. Vairo

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

In order to predict the cosmological abundance of dark matter, an estimation of particle rates in an expanding thermal environment is needed. For thermal dark matter, the non-relativistic regime sets the stage for the freeze-out of the dark matter energy density. We compute transition widths and annihilation, bound-state formation, and dissociation cross sections of dark matter fermion pairs in the unifying framework of non-relativistic effective field theories at finite temperature, with the thermal bath modeling the thermodynamical behaviour of the early universe. We reproduce and extend some known results for the paradigmatic case of a dark fermion species coupled to dark gauge bosons. The effective field theory framework allows to highlight their range of validity and consistency, and to identify some possible improvements.

Original languageEnglish
Article number6
JournalJournal of High Energy Physics
Volume2023
Issue number7
DOIs
StatePublished - Jul 2023

Keywords

  • Cosmology of Theories BSM
  • Early Universe Particle Physics
  • Effective Field Theories
  • Thermal Field Theory

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