具有低于弱电尺度再加热温度的轻子生成
Leptogenesis with sub-electroweak-scale reheating temperature
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中文总结 AI 辅助
研究暴胀后再加热时期通过轻子生成产生宇宙重子不对称性，在单项式暴胀势框架下分析三种微扰再加热情景，确定成功重现重子不对称性的参数空间区域，强调原初引力波观测对这类情景的探测潜力。
中文摘要 AI 辅助
我们研究了暴胀后再加热时期通过轻子生成产生宇宙重子不对称性的情况，考虑了低于弱电相变温度的再加热温度。在再加热期间单项式暴胀势的框架内，我们分析了三种微扰再加热情景，即暴胀子衰变成（i）一对类似标准模型的玻色子，（ii）一对类似标准模型的费米子，或（iii）仅衰变成一对重的右手型中微子。对于每种情况，我们确定了参数空间区域，这些区域在满足现有宇宙学约束的同时，通过在再加热期间跟踪弱电相变相互作用率，成功地重现了观测到的重子不对称性。我们还强调了未来原初引力波观测探测这类情景的潜力。
英文摘要
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. 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 Standard Model (SM)-like bosons, (ii) a pair of SM-like fermions, or (iii) exclusively into a pair of heavy right-handed neutrinos, which eventually decays into the SM final states after briefly dominating the energy density of the Universe. 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.
