Leptogenesis driven by majoron

Understand

We propose a leptogenesis scenario where baryon asymmetry generation is assisted by the kinetic motion of the majoron, $J$, in the process of lepton-number violating inverse decays of a right-handed neutrino, $N$.

• We investigate two distinct scenarios depending on the sources of majoron kinetic motion: 1) the misalignment mechanism, and 2) the kinetic misalignment mechanism.
• The former case can naturally generate the observed baryon asymmetry for the majoron mass $m_J \gtrsim \,{\rm TeV}$ and the right-handed neutrino's mass $M_{N} \gtrsim 10^{11}\,{\rm GeV}$.
• However, an additional decay channel of the majoron is required to avoid the overclosure problem of the majoron oscillation.