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arXiv 2601.09784hep-phastro-ph.COhep-lat
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轴子与非阿贝尔规范场之间的经典均分动力学

Classical equipartition dynamics between axions and non-Abelian gauge fields

Walter Burke Institute for Theoretical Physics, California Institute of Technology(加州理工学院沃尔特·伯克理论物理研究所);Fakultät für Physik, Universität Bielefeld(比勒费尔德大学物理学院);AEC, Institute for Theoretical Physics, University of Bern(伯尔尼大学理论物理研究所)

Kim V. Berghaus, Adrien Florio, M. Laine, Franz R. Sattler

AI总结:

通过经典实时光格模拟,研究轴子凝聚体与SU(2)规范场系综之间的能量转移,发现低动量规范模式指数增长、轴子振荡阻尼及能量均分,并观察到SU(2)与U(1)动力学的显著差异。

摘要:

受轴子暴涨及其在标准模型中的温暖嵌入启发,我们通过非线性经典实时光格模拟,研究了轴子凝聚体与SU(2)规范场系综之间能量转移的早期阶段。推导了离散运动方程,并详细阐述了高斯约束。在CosmoLattice平台上实现了数值解。采用二次势,忽略宇宙膨胀,我们观察到低动量规范模式的初始指数增长;轴子振荡在延迟后阻尼;以及随后轴子与规范场系综之间的能量均分。观察到SU(2)与U(1)动力学之间的明显差异,这可能与非阿贝尔自相互作用有关。我们阐述了这对SU(2)系综可能热化的意义。

英文摘要:

Motivated by axion-like inflation and its warm embedding within the Standard Model, we study the early stages of the energy transfer between an axion condensate and an SU(2) gauge ensemble, by employing non-linear classical real-time lattice simulations. The discretized equations of motion are worked out, elaborating on Gauss constraints. A numerical solution is implemented on the CosmoLattice platform. Adopting a quadratic potential, and omitting universe expansion, we establish initial exponential growth of the low-momentum gauge modes; damping of axion oscillations after some delay; and subsequent energy equipartition between axion and gauge ensembles. A clear difference between the SU(2) and U(1) dynamics is observed, likely associated with non-Abelian self-interactions. We elaborate on what this implies for the possible thermalization of the SU(2) ensemble.

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。

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