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arXiv 2602.02655hep-phastro-ph.HE
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普遍的风味摆动

The ubiquitous flavor pendulum

Istituto Nazionale di Fisica Nucleare (INFN), Sezione di Napoli(意大利国家核物理研究所(INFN)那不勒斯分部);Deutsches Elektronen-Synchrotron DESY(德国电子同步加速器研究中心);Max-Planck-Institut für Physik(马克斯·普朗克物理研究所)

Damiano F. G. Fiorillo, Georg G. Raffelt

AI总结:

研究揭示了经典自旋系统中普遍存在的风味摆动现象,通过分析集体模式和相空间变化,展示了其在不同系统中的出现机制及扩展意义。

摘要:

一个由经典相互作用自旋构成的系统可以发展出集体不稳定性,在非线性区域中,这种不稳定性会模仿陀螺摆动的运动。这种行为被称为风味摆动,出现在密集中微子等离子体的集体模式中,当通过对称性假设强烈减少相空间后。它已在均匀的慢速和快速风味系统中被识别,并且最近在快速系统的单波解中也出现。我们解释了其普遍出现的原因。我们展示了一个由三个经典自旋构成的系统必须总是摆动,或者在存在外部场的情况下只有两个。此外,这样的系统总是定义了一个时间不变长度的向量连续体。如果将这些视为相互作用自旋,则立即导致慢速和快速风味摆动的连续情况。作为另一个新的见解,这些自旋中的任何一个都可以被选为摆动,周期性地与系统其余部分交换风味。

英文摘要:

A system of classical interacting spins can develop collective instabilities which, in the nonlinear regime, mimic the motion of a gyroscopic pendulum. Known as the flavor pendulum, this behavior appears among the collective modes of a dense neutrino plasma after a strong reduction of phase space through symmetry assumptions. It has been identified in homogeneous slow and fast flavor systems and, most recently, in single-wave solutions of the fast system. We explain the reasons for its ubiquitous appearance. We show that a system of three classical spins must always be pendular, or only two in the presence of an external field. Furthermore, such a system always defines a continuum of vectors with time-independent length. If these are identified as interacting spins, they immediately lead to the continuum cases of slow and fast flavor pendula. As another new insight, any of these spins can be chosen as the pendulum, periodically exchanging flavor with the rest of the system.

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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