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arXiv 2103.13159hep-phastro-ph.HEnucl-th
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平衡附近磁场诱导的中微子手征输运

Magnetic field induced neutrino chiral transport near equilibrium

Naoki Yamamoto, Di-Lun Yang

摘要:

基于新近建立的左手中微子手征辐射输运理论,我们研究了核塌缩超新星中中微子在热平衡附近的手征输运。我们首先在弛豫时间近似下计算了手征辐射输运方程的近平衡解,其中弛豫时间直接由弱相互作用的有效场论导出。利用这个解,我们系统地导出了中微子能量动量张量和中微子数流在磁场作用下由核子吸收引起的非平衡修正的解析表达式.特别地,我们发现非平衡中微子能流正比于磁场。我们还讨论了它的现象学后果,如可能的关系,脉冲星踢。

英文摘要:

Based on the recently formulated chiral radiation transport theory for left-handed neutrinos, we study the chiral transport of neutrinos near thermal equilibrium in core-collapse supernovae. We first compute the near-equilibrium solution of the chiral radiation transport equation under the relaxation time approximation, where the relaxation time is directly derived from the effective field theory of the weak interaction. By using such a solution, we systematically derive analytic expressions for the nonequilibrium corrections of the neutrino energy-momentum tensor and neutrino number current induced by magnetic fields via the neutrino absorption on nucleons. In particular, we find the nonequilibrium neutrino energy current proportional to the magnetic field. We also discuss its phenomenological consequences such as the possible relation to pulsar kicks.

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