Akhmedov, V.A. Rubakov and A.Yu. The asymmetry is communicated from singlet neutrinos to ordinary leptons through their Yukawa couplings. The lepton asymmetry is then reprocessed into baryon asymmetry by electroweak sphalerons. We show that the observed value of baryon asymmetry can be generated in this way, and the masses of ordinary neutrinos induced by the seesaw mechanism are in the astrophysically and cosmologically interesting range. Except for singlet neutrinos, no physics beyond the Standard Model is required.
Results improve on previous variational energies in both phases.
In the liquid, the gain over a wave function with only pair and triplet correlations increases with density, providing a quantitative estimate of the increasing effect of higher order correlations. The discrepancy with the exact ground state energy is nearly constant over a wide range of densities, yielding excellent estimates for the equilibrium, freezing and melting densities. The optimal SWF can be represented with high precision by density-independent sets of variational parameters for the liquid and the solid phases. We simulate relatively large systems in order to explore the long-wavelength regime in detail. Even down to wavevectors where the excitation energy exhibits a highly linear dispersion, which would suggest a harmonic phonon mode, the kinetic and potential energies of the excitation are far from verifying equipartition.