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arXiv 2108.10035hep-ph
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热质量对手征涡旋效应和磁重子生成的贡献

Contribution of the thermal mass to the chiral vortical effect and magnetobaryogenesis

S. Abbaslu, S. Rostam Zadeh, S. S. Gousheh

AI总结:

本研究利用费米子有效热质量证明热平衡非手征电弱等离子体中可存在手征涡旋效应,指出汤川相互作用贡献不抵消,小瞬态涡旋涨落可激活该效应并在早期宇宙产生超磁场与正反物质不对称。

摘要:

我们利用对称相下费米子的有效热质量,证明处于热平衡的非手征电弱等离子体中可存在手征涡旋效应。我们采用了近期得到的涡旋流非微扰公式,该公式是色散关系的泛函。随后,我们在色散关系中纳入费米子热质量效应,证明对应的超电涡旋流会收到来自费米子的规范相互作用和汤川相互作用、与T²成正比的隐式热修正。我们发现,由于规范对称性,规范相互作用对总超电涡旋流中热质量的贡献会相互抵消,而汤川相互作用的贡献不会抵消。最后我们证明,得益于该电流,热平衡非手征电弱等离子体中零背景值附近的小瞬态涡旋涨落即可激活手征涡旋效应,进而在早期宇宙对称相、温度范围100GeV<T<10TeV的条件下,即便存在弱sphaleron过程,也能从零初始值开始产生超磁场和正反物质不对称性。

英文摘要:

We show that the chiral vortical effect can exist in a nonchiral electroweak plasma in thermal equilibrium using the effective thermal masses of the fermions in the symmetric phase. We use a nonperturbative formula for the vortical current, which has been recently obtained and is a functional of the dispersion relation. Then, taking into account the effect of fermion thermal mass in the dispersion relation, we show that the corresponding hyperelectric vortical current receives implicit thermal corrections proportional to T2, from both the gauge and Yukawa interactions of the fermion. We show that the contributions of gauge interactions to the thermal masses in the total hyperelectric vortical current cancel out due to the gauge symmetries, while those of the Yukawa interactions do not cancel out. We finally show that, due to this current, only small transient vorticity fluctuations about the zero background value in a nonchiral electroweak plasma in thermal equilibrium can activate the chiral vortical effect, leading to the generation of hypermagnetic fields and matter-antimatter asymmetries in the symmetric phase of the early Universe, in the temperature range 100GeV<T<10TeV, all starting from zero initial values, even in the presence of the weak sphaleron processes.

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