Reducing the spectral index in F-term hybrid inflation through a complementary modular inflation

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dc.creatorLazarides, G.
dc.creatorPallis, C.
dc.date2007-02-26
dc.date2007-09-21
dc.date.accessioned2026-07-07T11:22:41Z
dc.date.available2026-07-07T11:22:41Z
dc.descriptionWe consider two-stage inflationary models in which a superheavy scale F-term hybrid inflation is followed by an intermediate scale modular inflation. We confront these models with the restrictions on the power spectrum P_R of curvature perturbations and the spectral index n_s implied by the recent data within the power-law cosmological model with cold dark matter and a cosmological constant. We show that these restrictions can be met provided that the number of e-foldings N_HI* suffered by the pivot scale k_*=0.002/Mpc during hybrid inflation is appropriately restricted. The additional e-foldings required for solving the horizon and flatness problems can be naturally generated by the subsequent modular inflation. For central values of P_R and n_s, we find that, in the case of standard hybrid inflation, the values obtained for the grand unification scale are close to its supersymmetric value M_GUT=2.86 x 10^16 GeV, the relevant coupling constant is relatively large (0.005-0.14), and N_HI* between about 10 and 21.7. In the case of shifted [smooth] hybrid inflation, the grand unification scale can be identified with M_GUT provided that N_HI*=21 [N_HI*=18].
dc.description8 pages including 3 figures, uses Revtex, version appeared in PLB
dc.identifierhttps://arxiv.org/abs/hep-ph/0702260
dc.identifierhttp://arxiv.org/abs/hep-ph/0702260
dc.identifierPhys.Lett.B651:216-223,2007
dc.identifierdoi:10.1016/j.physletb.2007.06.008
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/194652
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectAstrophysics
dc.titleReducing the spectral index in F-term hybrid inflation through a complementary modular inflation
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