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Evolution of the Primordial Axial Charge across Cosmic Times

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arxiv 2007.13691 v3 pith:QVXYN4RW submitted 2020-07-27 hep-ph astro-ph.COhep-th

Evolution of the Primordial Axial Charge across Cosmic Times

classification hep-ph astro-ph.COhep-th
keywords axialchargedecaycosmicacrossalphaarisesbeen
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We investigate collisional decay of the axial charge in an electron-photon plasma at temperatures 10 MeV - 100 GeV. We demonstrate that the decay rate of the axial charge is first order in the fine-structure constant $\Gamma_{\rm flip}\propto \alpha m_{e}^{2}/T$ and thus orders of magnitude greater than the naive estimate which has been in use for decades. This counterintuitive result arises through infrared divergences regularized at high temperature by environmental effects. The decay of axial charge plays an important role in the problems of leptogenesis and cosmic magnetogenesis.

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