arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2602.12477hep-phastro-ph.CO
收藏

迈向完整的宇宙学中微子自相互作用方案:适用于广泛介子质量范围的碰撞项

Towards a complete scheme of cosmological neutrino self-interactions: Collision term for a wide range of mediator masses

Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional(墨西哥国立理工学院高级研究中心);Secretaría de Ciencia, Humanidades, Tecnología e Innovación(科学、人文、技术与创新秘书处);Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México(墨西哥国立自治大学物理科学研究所);Tecnológico de Monterrey, Escuela de Ingeniería y Ciencias(蒙特雷理工学院工程与科学学院)

Ivan Pérez-Castro, Josue De-Santiago, Gabriela Garcia-Arroyo, Jorge Venzor, Abdel Pérez-Lorenzana

AI总结:

本文提出一种新框架,用于在玻尔兹曼层级中获得中微子-中微子碰撞项,考虑中微子和介子质量作为自由参数,为未来分析提供工具,并展示非共振情况下从轻介子到重介子近似平滑过渡。

摘要:

中微子自相互作用(NSI)提供了解决标准宇宙学异常和现有宇宙学张力的潜在途径。本文提出一种新框架,用于在玻尔兹曼层级中获得中微子-中微子碰撞项,将中微子和介子质量作为自由参数。我们的计算涵盖了类似狄拉克和马约拉纳中微子,并区分两种中微子质量本征态。本工作为未来分析提供有价值工具,若检测到NSI信号。值得注意的是,我们的结果显示在宇宙冷却过程中,非共振情况下从轻介子到重介子近似平滑过渡。因此,对于广泛研究的重介子,我们的新方案消除了在高红移时温度上升超过介子质量时的近似需求,并提供了测试重介子范式有效性的工具。尽管本文专注于由标量粒子介导的NSI,但所提出的框架可扩展到更广泛的中微子NSI以及可能的温暖暗物质自相互作用场景。

英文摘要:

Neutrino self-interactions (NSI) offer a potential pathway to address anomalies in standard cosmology and explain existing cosmological tensions. In this work, we present a novel framework to obtain the neutrino--neutrino collision term within the Boltzmann hierarchy, incorporating both neutrino and mediator masses as free parameters. Our calculations encompass both Dirac-like and Majorana neutrinos and distinguish between two neutrino mass eigenstates. This work provides a valuable tool for future analyses, should a NSI signal be detected. Remarkably, our results show a smooth transition from the light to the heavy mediator approximation as the Universe cools down for non-resonant cases. Thus, for the widely studied heavy mediator, our new scheme eliminates the need to approximate at high redshifts when the temperature increases above the mediator mass, and it provides the tools to test the threshold of validity of the heavy mediator paradigm. While this work focuses on NSI mediated by a scalar particle, the presented framework could be adapted to a broader range of neutrino NSI and possibly to warm dark matter self-interacting scenarios.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑