Quantify flavor and finite-temperature effects on leptogenesis boundaries

Determine how a full flavor-dependent Boltzmann treatment and dedicated finite-temperature calculations modify the viable parameter-space boundaries for thermal and non-thermal leptogenesis in the minimal Higgs parity model, including whether the changes remain at the stated order-one level.

Background

The paper derives the viable leptogenesis parameter space using an approximate treatment that does not fully resolve lepton-flavor effects and does not include dedicated finite-temperature calculations. These approximations may affect the predicted boundaries of the parameter region, although the authors expect the central conclusions to remain unchanged. A systematic treatment is therefore left unresolved.

References

Several refinements remain for future work. A full flavor-dependent Boltzmann treatment and dedicated finite-temperature calculations could shift the present boundaries by $\mathcal{O}(1)$ factors, though the central conclusions are not expected to change.

— TeV-scale leptogenesis in a parity symmetric neutrino mass model  (2608.19367 - Harigaya et al., 19 Aug 2026) in Section 5, Conclusions