Scale hierarchies, supersymmetry and cosmology

Antoniadis, Ignatios (2018). Scale hierarchies, supersymmetry and cosmology. International journal of modern physics. A - particles and fields, gravitation, cosmology, 33(34), p. 1845003. World Scientific 10.1142/S0217751X18450033

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I discuss a general class of models where the inflation is driven by supersymmetry breaking with the superpartner of the goldstino (sgoldstino) playing the role of the inflaton. Imposing an R-symmetry allows to satisfy easily the slow-roll conditions, avoiding the so-called η-problem, and leads to two different classes of small field inflation models; they are characterized 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. Inflation can be driven by either an F- or a D-term, while the minimum has a positive tuneable vacuum energy. The models agree with cosmological observations and in the simplest case predict a tensor-to-scalar ratio of primordial perturbations 10−9≲r≲10−4 and an inflation scale 1010GeV≲H∗≲1012GeV.

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