Lepto-axiogenesis

Abstract

We propose a baryogenenesis mechanism that uses a rotating condensate of a Peccei-Quinn (PQ) symmetry breaking field and the dimension-five operator that gives Majorana neutrino masses. The rotation induces charge asymmetries for the Higgs boson and for lepton chirality through sphaleron processes and Yukawa interactions. The dimension-five interaction transfers these asymmetries to the lepton asymmetry, which in turn is transferred into the baryon asymmetry through the electroweak sphaleron process. QCD axion dark matter can be simultaneously produced by dynamics of the same PQ field via kinetic misalignment or parametric resonance, favoring an axion decay constant fa ≲ 1010 GeV, or by conventional misalignment and contributions from strings and domain walls with fa ∼ 1011 GeV. The size of the baryon asymmetry is tied to the mass of the PQ field. In simple supersymmetric theories, it is independent of UV parameters and predicts the supersymmtry breaking mass scale to be $$ \mathcal{O} $$ O (10 − 104) TeV, depending on the masses of the neutrinos and whether the condensate is thermalized during a radiation or matter dominated era. The high supersymmetry breaking mass scale may be free from cosmological and flavor/CP problems. We also construct a theory where TeV scale supersymmetry is possible. Parametric resonance may give warm axions, and the radial component of the PQ field may give signals in rare kaon decays from mixing with the Higgs and in dark radiation.

Axiogenesis from SU(2)R phase transition

“…In this paper, we assume that the SU(2) R sphaleron is the dominant process that produces (effective) B − L asymmetry. If the generation of neutrino masses involves lepton number violation, it may also contribute to the production of B − L asymmetry [16,17]. In the models with H L , the neutrino mass may be given by a lepton number-conserving Dirac mass H † L H † R¯ and does not produce B − L. In the models with Φ, to avoid too large Dirac masses from the Yukawa coupling Φ¯ or Φ¯ , we introduce singlets S that obtain Dirac masses with right-handed neutrinos via S¯ H † R .…”

“…So far we assume that the QCD axion dark matter dominantly comes from the kinetic misalignment mechanism. When the rotation of the PQ symmetry breaking field is induced by a large field value of the radial direction, the initial rotation, before being thermalized, is not completely circular, and axions may be produced by parametric resonance [17,64,65];…”

“…see [17,65] for the estimation of the production rate of axions from a rotating PQ symmetry breaking field. If these axions are not thermalized subsequently, they also contribute to dark matter.…”

“…In this scenario, the electroweak phase transition temperature, which would be correlated with masses of new particles that couple to the SM-like Higgs to modify the electroweak phase transition, is predicted as a function of the QCD axion decay constant [13]. Lepton number violation by a dimension-5 Majorana neutrino mass operator can also create baryon asymmetry [16,17] and is investigated in [17] in the context of axion rotations.…”

Spontaneous baryogenesis from axions with generic couplings

“…in the case where the axion couples to the strong Chern-Simons term, aGG. Our formalism generalizes this to an arbitrary transport equation with an arbitrary axion couplings.5 Soon after we uploaded our paper on the arXiv, ref [25]. appeared, independently also pointing out that aGG can source the B − L asymmetry in the presence of the Weinberg operator.…”