It is shown that the dynamics of domain walls in left-right symmetric models, separating respective regions of unbroken SU(2) L and SU(2) R in the early universe, can give rise to baryogenesis via leptogenesis. Neutrinos have a spatially varying complex mass matrix due to CP-violating scalar condensates in the domain wall. The motion of the wall through the plasma generates a flux of lepton number across the wall which is converted to a lepton asymmetry by helicity-flipping scatterings. Subsequent processing of the lepton excess by sphalerons results in the observed baryon asymmetry, for a range of parameters in left-right symmetric models.
Pseudo-Goldstone bosons couple with photons through a P and T violating interaction of the form L I = g aγγ aFF . Strong magnetic fields in rotating compact stars induce a non-zero E · B outside the stellar surface which acts as a source for the pseudo-scalar field. Pulsar signals propagating through this pseudo-scalar 'hair' suffer a differential time lag between the left and the right circularly polarised modes because of the P and T violating pseudoscalar boson-photon interaction. Determination of this time lag upto a microsecond accuracy can lead to a measurment of (or rule out) pseudo-Goldstone boson-photon coupling upto g aγγ ≤ 4.6 × 10 −9 GeV −1 .
We consider here a nonperturbative mechanism for the production of Higgs particles through vacuum excitations. It appears that it could already have been seen in "chiron" events, "halo" events, and some other signals in high-energy cosmic-ray collisions.
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