Affleck-Dine leptogenesis with varying Peccei-Quinn scale

Abstract

The Affleck-Dine leptogenesis scenario along the LH u flat direction is reconsidered. It is known that successful Affleck-Dine leptogenesis requires that the lightest neutrino mass is extremely small. This situation can be significantly relaxed if the neutrino mass in the early universe is different from the present one. We consider a supersymmetric Dine-Fischler-Srednicki-Zhitnitsky (DFSZ) type model, which provides a solution to the strong CP problem and generates a SUSY µ-term and right-handed neutrino masses. If the PQ scale during lepton number generation is much larger than the present value, leptogenesis is very efficient so that enough baryon number can be generated without introducing a hierarchically small neutrino mass. The final baryon asymmetry is related to the µ-term, and hence linked to the level of electroweak fine-tuning. We also show the PQ breaking scalar dynamics that keeps a large PQ breaking scale during inflation and lepton number generation. The µ-term generating superpotential plays an important role for preserving the lepton asymmetry during saxion oscillation. In this scenario, the axion isocurvature perturbation is naturally suppressed.

Prospects for axion detection in natural SUSY with mixed axion-higgsino dark matter: back to invisible?

“…Their decays can also inject hadronic or electromagnetic energy into the cosmic plasma after the onset of Big Bang Nucleosynthesis (BBN). These effects are included in our computer calculations[47,53,54] although with the rather high multi-TeV value of m 3/2 assumed here, they are rarely an issue.2 This value of TR is in accord with baryogenesis mechanisms such as non-thermal or Affleck-Dine leptogenesis[61,62].…”

Second leptogenesis: Unraveling the baryon-lepton asymmetry discrepancy

“…The interaction between particles and the wave DM provides the time-dependent mass of the particles. Some references have investigated leptogenesis with the varying neutrino mass by using quintessence dark energy [66,67], the neutrino itself as dark energy [68], or other new physics [69]. Nevertheless, none of these works discussed the possibility of the second leptogenesis.…”