膜修正宇宙学中的轻子生成：原初引力波中的特征
Leptogenesis in Brane-modified cosmology: Signatures in primordial gravitational waves
浏览论文内容
中文总结 AI 辅助
该研究探讨膜修正早期宇宙演化对轻子生成的影响，分析其改变原初引力波谱能密度的机制，确定相关参数空间，为间接探测高能标轻子生成场景提供新途径。
中文摘要 AI 辅助
我们研究受膜启发的早期宇宙演化修正对通过轻子生成实现重子产生过程的影响。修正后的宇宙演化会改变控制轻子不对称性的玻尔兹曼方程的演化，为在标准宇宙学场景中无法触及的参数空间区域中实现成功的轻子生成提供了可能。此外，修正后的宇宙演化还会改变暴胀期间产生的原本标度不变的原初引力波（PGWs）的谱能密度（SED）的形状。这确立了一种新颖且间接的探测方式，即通过未来观测原初引力波的SED来探测高能标轻子生成场景。本工作中，我们考虑了暴胀后、辐射主导时代前具有单个和多个刚性物态方程阶段的两种场景，确定了可实现成功轻子生成的参数空间，以及原初引力波的可能可观测性，从而通过原初引力波为该轻子生成场景提供了一个间接窗口。
英文摘要
We investigate the implications of brane-inspired modifications of the evolutionary history of the early universe on the process of baryogenesis via leptogenesis. A modified cosmic history alters the evolution of the Boltzmann equations governing lepton asymmetry, providing the possibility of successful leptogenesis in regions of the parameter space inaccessible in the standard cosmological scenario. Furthermore, a modified cosmic history also alters the shape of an otherwise scale-invariant spectral energy density (SED) of primary gravitational waves (PGWs) produced during inflation. This establishes a novel yet indirect probe of high scale leptogenesis scenarios through the observation of the SED of PGWs via future observations. We consider two scenarios in this work with single and multiple epochs of stiff equation of state(s) after inflation and before the epoch of radiation domination. We identify the parameter space where successful leptogenesis is possible, along with the possible observability of the PGWs, hence providing an indirect window into this leptogenesis scenario through PGWs.
