An off-diagonal thermal potential from sterile neutrino self-interactions generates the baryon asymmetry at lower order in the Yukawa coupling, boosting it and relaxing the mass degeneracy required in vanilla ARS leptogenesis.
Navas et al.,Review of particle physics, Phys
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Freeze-in leptogenesis with sterile neutrino self-interactions
An off-diagonal thermal potential from sterile neutrino self-interactions generates the baryon asymmetry at lower order in the Yukawa coupling, boosting it and relaxing the mass degeneracy required in vanilla ARS leptogenesis.