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Scale of Dirac leptogenesis and left-right symmetry in the light of recent PTA results
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abstract
Motivated by the recent release of new results from five different pulsar timing array (PTA) experiments claiming to have found compelling evidence for primordial gravitational waves (GW) at nano-Hz frequencies, we study the consequences for two popular beyond the Standard Model (SM) frameworks, where such nano-Hz GW can arise due to annihilating domain walls (DW). Minimal framework of Dirac leptogenesis, as well as left-right symmetric model (LRSM) can lead to formation of DW due to spontaneous breaking of $Z_2$ symmetry. Considering the NANOGrav 15 yr data, we show that the scale of Dirac leptogenesis should be above $10^7$ GeV for conservative choices of Dirac Yukawa couplings with fine-tuning at the level of the SM. The scale of {\it minimal} LRSM is found to be more constrained $M_{\rm LR} \sim 10^6$ GeV in order to fit the NANOGrav 15 yr data. On the other hand, the {\it non-minimal} LRSM can be compatible with the NANOGrav data for $10^2 \, {\rm TeV} \lesssim M_{\rm LR} \lesssim 10^3$ TeV but with the corresponding $B-L$ breaking scale violating collider bounds.
Forward citations
Cited by 3 Pith papers
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Gravitational waves from seesaw assisted collapsing domain walls
Right-handed-neutrino couplings generate the energy bias that collapses Z2 domain walls, linking the type-I seesaw mass scale to observable gravitational-wave peaks and to resonant leptogenesis.
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Electromagnetic Dirac Cogenesis
A single out-of-equilibrium decay chain of heavy vector-like fermions via electromagnetic dipole operators can simultaneously generate the baryon asymmetry and an asymmetric dark matter relic with mass around 1.9 prot...
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NANOGrav 15-year gravitational-wave signals from binary supermassive black-holes seeded by primordial black holes, and implications for the origins of Little Red Dots
A PBH abundance of 10^-14–10^-12 of CDM, with seed masses 1–10^3 M_sun, is fitted to the NANOGrav 15-year background via SMBH mergers, consistent with 21-cm limits.
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