Leptogenesis with sub-electroweak-scale reheating temperature

Basabendu Barman; Arindam Basu; Debasish Borah; Nayan Das

Leptogenesis with sub-electroweak-scale reheating temperature

高能物理 - 唯象学 2026-07-10 v1 宇宙学与河外天体物理

作者: Basabendu Barman , Arindam Basu , Debasish Borah , Nayan Das

摘要

We study the generation of the baryon asymmetry of the Universe via leptogenesis during the post-inflationary reheating epoch, considering reheating temperatures below the temperature of sphaleron freeze-out temperature. Within the framework of a monomial inflaton potential during reheating, we analyze three perturbative reheating scenarios in which the inflaton decays into (i) a pair of SM-like bosons, (ii) a pair of SM-like fermions, or (iii) exclusively into a pair of heavy right-handed neutrinos. For each case, we identify the regions of parameter space that successfully reproduce the observed baryon asymmetry consistently tracking the sphaleron interaction rate during reheating, while satisfying existing cosmological constraints. We also highlight the potential of future primordial gravitational wave observations to probe this class of scenarios.

引用

@article{arxiv.2607.09282,
  title  = {Leptogenesis with sub-electroweak-scale reheating temperature},
  author = {Basabendu Barman and Arindam Basu and Debasish Borah and Nayan Das},
  journal= {arXiv preprint arXiv:2607.09282},
  year   = {2026}
}

备注

37 pages, 15 captioned figures