Fermion-antifermion mixing in gravitational fields
Abstract
Mixing of fermion and antifermion states occurs in gravitational interactions, leading to non-conservation of fermion number above temperatures determined by the particle masses. We study the evolution of a f\,,f system and calculate the cross sections for the reactions ff. Their values are identical in both directions. However, if f changes quickly into a lighter antiparticle, then the reaction symmetry is broken, resulting in an increased production of matter over antimatter.
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