Abstract
A realistic tribrid model of sneutrino inflation is constructed in an R-symmetric SU(5) grand unified theory (GUT). To avoid the monopole problem, a pseudosmooth inflationary trajectory is generated with the help of an additional Z5 symmetry which is broken during and after inflation. The predictions of inflationary parameters are made at the central value of the scalar spectral index, ns =0.968. The largest possible value of the tensor to scalar ratio, r≲ 0.0027, is obtained with sub-Planckian field values (≲ mP). A successful realization of reheating and leptogenesis is achieved by avoiding the gravitino problem with a reheat temperature as low as 106 GeV. The predicted range of the gauge symmetry breaking scale, 5 × 1016 ≲ M/GeV ≲ 5 × 1017, turns out to be somewhat larger than the typical GUT scale. With additional vector-like families, a successful gauge coupling unification is achieved by avoiding the no-go theorem related to R-symmetric SU(5) GUT.
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