We propose a supersymmetric model with a left-right symmetric gauge gr
oup where hybrid inflation,baryogenesis and neutrino oscillations are
closely linked. This scheme, supplemented by a familiar ansatz for the
neutrino Dirac masses and mixing of the two heaviest families and wit
h the MSW resolution of the solar neutrino puzzle, implies that 1 eV l
ess than or similar to m(nu tau) less than or similar to 9 eV. The mix
ing angle 8,1 is predicted to lie in a relatively narrow range which w
ill be partially reared by the Chorus/Nomad experiment. Restrictions o
n the CP violating phase delta(mu tau) are also derived (C) 1998 Elsev
ier Science B,V. All rights reserved.