Abstract
We study the inclusion of new heavy fermions on complex scalar dark matter (DM) phenomenology within gauged two Higgs doublet model (G2HDM). We find that for DM mass above 1 TeV, heavy quarks coannihilations into the Standard Model (SM) quarks and gluons dominate the thermally-averaged cross section relevant for the relic abundance of complex scalar DM. We demonstrate that the effects of QCD Sommerfeld correction as well as QCD bound state formation in determining the DM relic density are negligible. We show that the allowed parameter space is significantly constrained by the current PLANCK relic density data as well as XENON1T limit appropriate for DM direct search.
Highlights
The nature of dark matter (DM) is one of the open problems in cosmology, astrophysics and particle physics
We evaluate the effects of heavy fermions on DM phenomenology for triplet-like DM and Goldstone-like DM separately
The motivation of this paper is to study the effects of heavy fermions on the complex scalar DM phenomenology which is omitted in the previous work
Summary
The nature of dark matter (DM) is one of the open problems in cosmology, astrophysics and particle physics. The current understanding of our universe can be explained very well if one includes the existence of the cold DM in addition to the ordinary matter and dark energy. It has been assumed that the DM was in thermal equilibrium with the Standard Model (SM) particles in the early universe. One of the most popular and well studied DM candidates so far is the weakly interacting massive particle (WIMP). This candidate fits the observed DM abundance with the typical electroweak scale annihilation cross section
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