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Equilibration of the chiral asymmetry due to finite electron mass in electron-positron plasma | | A. Boyarsky
; V. Cheianov
; O. Ruchayskiy
; O. Sobol
; | | Date: |
2 Aug 2020 | | Abstract: | We calculate the rate of collisional decay of the axial charge in an
ultrarelativistic electron-positron plasma, also known as the chirality
flipping rate. We find that contrary to the existing estimates, the chirality
flipping rate appears already in the first order in the fine-structure constant
$alpha$ and is therefore orders of magnitude greater than previously believed.
This happens because the processes of near-collinear bremsstrahlung can occur
in plasma due to the modified dispersion relations and finite quasiparticles’
lifetime. Moreover, even higher-order processes, e.g., the Compton scattering,
also contribute to $mathcal{O}(alpha)$ result because of the infrared
divergence in their cross section being regularized on the soft scale $sim eT$
by thermal corrections. Our results are important for the description of the
early Universe processes (such as leptogenesis or magnetogenesis) that affect
differently left- and right-chiral fermions of the Standard Model, as discussed
in more details in the companion Letter. | | Source: | arXiv, 2008.00360 | | Services: | Forum | Review | PDF | Favorites | |
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