Flipped GUT Inflation

Abstract

We analyse the prospects for constructing hybrid models of inflation that provide a dynamical realisation of the apparent closeness between the supersymmetric GUT scale and the possible scale of cosmological inflation. In the first place, we consider models based on the flipped SU(5)$\times$U(1) gauge group, which has no magnetic monopoles. In one model, the inflaton is identified with a sneutrino field, and in the other model it is a gauge singlet. In both cases we find regions of the model parameter spaces that are compatible with the experimental magnitudes of the scalar perturbations, $A_s$, and the tilt in the scalar perturbation spectrum, $n_s$, as well as with an indicative upper limit on the tensor-to-scalar perturbation ratio, $r$. We also discuss embeddings of these models into SO(10), which is broken at a higher scale so that its monopoles are inflated away.

21 pages, 4 figures

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• Shift Symmetry and Higgs Inflation in Supergravity with Observable Gravitational Waves
• Gravity Waves and Proton Decay in Flipped SU(5) Hybrid Inflation Model
• Kinetically Modified Non-Minimal Higgs Inflation in Supergravity
• The Inflaton Portal to Dark Matter
• New Inflation in Supersymmetric SU(5) and Flipped SU(5) GUT Models
• Sneutrino driven GUT Inflation in Supergravity
• Single Field Inflation in Supergravity with a $U(1)$ Gauge Symmetry
• Sneutrinos as Mixed Inflaton and Curvaton
• No-scale hybrid inflation with R-symmetry breaking
• Multi-chaotic inflation with and without spectator field
• Witten's loop in the minimal flipped $SU(5)$ unification revisited
• Analytical study of classic models of Hybrid Inflation