Baryogenesis in an SO(10) gut model with Pati-Salam intermediate symmetry

The possibility of generating the observed baryon asymmetry of the universe in an SO(10) gauge model with spontaneous symmetry breaking pattern SO(10) (M-X) under right arrow SU(4)(PS) x SU(2)(L) x SU(2)(R) (M-R) under right arrow SU(3)c x SU(2)(L) x U(1)(Y) (M-Z) under right arrow SU(3)(c) U(1)(Q) is studied. We find it possible to generate a Delta B = B-n(-n)(B) over bar/s similar to 10(-11), converting the leptonic number produced at the B - L breaking scale via the B + L violating processes mediated by sphalerons at the electroweak scale. The resulting picture is tested against the limit coming from experimental data: proton lifetime and neutrino oscillations.