Flipped GUT Inflation
John Ellis, Tomas E. Gonzalo, Julia Harz, Wei-Chih Huang

TL;DR
This paper explores hybrid inflation models based on flipped SU(5)$\times$U(1), identifying parameter regions compatible with observational data and discussing embeddings into SO(10) to address monopole issues.
Contribution
It introduces flipped SU(5)$\times$U(1) inflation models with specific inflaton candidates and analyzes their compatibility with cosmological observations, including potential embeddings into SO(10).
Findings
Models compatible with $A_s$, $n_s$, and $r$ constraints.
Inflation can occur with sneutrino or gauge singlet inflaton.
Embedding into SO(10) addresses monopole problems.
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)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, , and the tilt in the scalar perturbation spectrum, , as well as with an indicative upper limit on the tensor-to-scalar perturbation ratio, . We also discuss embeddings of these models into SO(10), which is broken at a higher scale so that its monopoles are inflated away.
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