AI 中文总结
研究轴子样暴胀子产生右手型中微子及对非热轻子生成的影响，通过统一处理暴胀和预热中马约拉纳费米子产生，计算不同衰变极限下丰度，阐明相关基的关系，确定与重子不对称一致的参数区域。
AI 中文摘要
我们研究了通过与轴子样暴胀子的导数耦合产生重右手型中微子及其对非热轻子生成的影响。我们对暴胀和预热期间马约拉纳费米子的产生进行了统一处理。暴胀期间，滚动的暴胀子背景产生螺旋度不对称谱，在慢滚极限下可解析得到；预热期间，振荡背景驱动具有螺旋度依赖有效动量和自然动量截断的重复非绝热产生事件。我们计算了延迟衰变和即时衰变极限下的产生丰度，包括泡利阻塞和连续产生阶段的影响。我们还进一步阐明了用于识别非绝热产生的费米子基与用于定义瞬时占据数的哈密顿量对角基之间的关系。将这些结果应用于非热轻子生成，我们确定了与观测到的重子不对称一致的参数区域。
英文摘要
We study heavy right-handed neutrino production induced by a derivative coupling to an axion-like inflaton and its implications for non-thermal leptogenesis. We develop a unified treatment of Majorana-fermion production during inflation and preheating. During inflation, the rolling inflaton background generates a helicity-asymmetric spectrum that can be obtained analytically in the slow-roll regime, while during preheating the oscillating background drives repeated non-adiabatic production events with a helicity-dependent effective momentum and a natural momentum cutoff. We compute the resulting abundance in both the delayed-decay and prompt-decay limits, including the effects of Pauli blocking and successive production stages. We further clarify the relation between the fermion basis used to identify non-adiabatic production and the Hamiltonian-diagonal basis used to define instantaneous occupation numbers. Applying these results to non-thermal leptogenesis, we identify parameter regions consistent with the observed baryon asymmetry.
Comments52 pages, 12 figures
