Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-05-08
Phys.Lett.B567:79,2003; Phys.Lett.B567:79-86,2003
Physics
High Energy Physics
High Energy Physics - Phenomenology
1+16 pages, 7 figures; minor revisions, references added, to appear in Phys. Lett. B
Scientific paper
10.1016/j.physletb.2003.06.030
We reconsider a class of well motivated supersymmetric models in which inflation is associated with the breaking of a gauge symmetry G to H, with the symmetry breaking scale M~10^16 GeV. Starting with a renormalizable superpotential, we include both radiative and supergravity corrections to derive the inflationary potential. The scalar spectral index n_s can exceed unity in some cases, and it cannot be smaller than 0.98 if the number of e-foldings corresponding to the present horizon scale is around 60. Two distinct variations of this scenario are discussed in which non-renormalizable terms allowed by the symmetries are included in the superpotential, and one finds n_s>=0.97. The models discussed feature a tensor to scalar ratio r<~10^-4, while dn_s/dlnk<~10^-3. If G corresponds to SO(10) or one of its rank five subgroups, the observed baryon asymmetry is naturally explained via leptogenesis.
Senoguz Nefer V.
Shafi Qaisar
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