Inflation from supersymmetry breaking

Abstract : We explore the possibility that inflation is driven by supersymmetry breaking with the superpartner of the goldstino (sgoldstino) playing the role of the inflaton. Moreover, we impose an R-symmetry that allows one to satisfy easily the slow-roll conditions, avoiding the so-called ηη -problem, and leads to two different classes of small-field inflation models; they are characterised by an inflationary plateau around the maximum of the scalar potential, where R-symmetry is either restored or spontaneously broken, with the inflaton rolling down to a minimum describing the present phase of our Universe. To avoid the Goldstone boson and be left with a single (real) scalar field (the inflaton), R-symmetry is gauged with the corresponding gauge boson becoming massive. This framework generalises a model studied recently by the present authors, with the inflaton identified by the string dilaton and R-symmetry together with supersymmetry restored at weak coupling, at infinity of the dilaton potential. The presence of the D-term allows a tuning of the vacuum energy at the minimum. The proposed models agree with cosmological observations and predict a tensor-to-scalar ratio of primordial perturbations 10^-9 <∼ r <∼ 10^-4 and an inflation scale 10^10 GeV <∼ 10^12GeV. H∗ may be lowered up to electroweak energies only at the expense of fine-tuning the scalar potential.
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Article dans une revue
European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2017, 77 (11), pp.724. 〈10.1140/epjc/s10052-017-5302-y〉
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I. Antoniadis, A. Chatrabhuti, H. Isono, R. Knoops. Inflation from supersymmetry breaking. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2017, 77 (11), pp.724. 〈10.1140/epjc/s10052-017-5302-y〉. 〈hal-01633730〉



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