The non-supersymmetric and supersymmetric versions of hybrid inflation are summarized. In the latter, the necessary inclination along the inflationary trajectory is provided by radiative corrections.â€¦ (More)

We construct concrete supersymmetric grand unified theories based on the Pati-Salam gauge group SU (4) c Ã— SU (2) L Ã— SU (2) R which naturally lead to a moderate violation of 'asymptotic' Yukawaâ€¦ (More)

We propose a new realization of the chaotic inflationary scenario in which the scalar field responsible for inflation also spontaneously breaks the underlying gauge symmetry at a superheavy scale âˆ¼â€¦ (More)

We consider a supersymmetric model of inflation in which the primordial density fluctuations are nearly scale invariant (spectral index n â‰ˆ 0.98) with amplitude proportional to (M/M P) 2 , where M âˆ¼â€¦ (More)

The supersymmetric sector of minimal supersymmetric standard model (MSSM) possesses a U (1) R-symmetry which contains Z 2 matter parity. Non-zero neutrino masses, consistent with a 'redefined'â€¦ (More)

We show how hybrid inflation can be successfully realized in a supersymmetric model with gauge group G P S = SU (4) c Ã— SU (2) L Ã— SU (2) R. By including a non-renormalizable superpotential term, weâ€¦ (More)

George Lazarides, âˆ— Roberto Ruiz de Austri, â€ and Roberto Trotta â€¡ Physics Division, School of Technology, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece University of Sheffield,â€¦ (More)

Supersymmetric Peccei-Quinn models which provide a suitab le candidate for the curvaton field are studied. These models also solve the Î¼ problem, while generating the Peccei-Quinn scale dynamically.â€¦ (More)

A moderate extension of the minimal supersymmetric standard model which includes a U(1)Bâˆ’L gauge group (B and L being the baryon and lepton number) and a Peccei-Quinn symmetry, U(1)PQ , is presented.â€¦ (More)