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Kinetic equations for sterile neutrinos from thermal fluctuations

Nov 12, 2019

30 pages

Published in:

JCAP 02 (2020) 033

Published: Feb 27, 2020

e-Print:

1911.05092 [hep-ph]

DOI:

10.1088/1475-7516/2020/02/033 (publication)

View in:

ADS Abstract Service

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Abstract: (arXiv)

We obtain non-linear kinetic equations for sterile neutrino occupancies and lepton minus baryon numbers by matching real time correlation functions of thermal fluctuations computed in an effective description to those computed in thermal quantum field theory. After expanding in the sterile-neutrino Yukawa couplings, the coefficients in the equations are written as real time correlation functions of Standard Model operators. Our kinetic equations are valid for an arbitrary number of sterile neutrinos of any mass spectrum. They can be used to describe, e.g., low-scale leptogenesis via neutrino oscillations, or sterile neutrino dark matter production in the Higgs phase.

Note:

30 pages. v2: Typos corrected, results unchanged, published version

neutrino: sterile
fluctuation: thermal
neutrino: oscillation
neutrino: dark matter
correlation function: thermal
field theory: thermal
dark matter: production
coupling: Yukawa
kinetic
baryon number

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