Scale hierarchies, supersymmetry and cosmology

Ignatios Antoniadis (1)

1 LPTHE - Laboratoire de Physique Théorique et Hautes Energies

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.

Mots clés: scale: inflation; inflation: model; supersymmetry: symmetry breaking; perturbation: primordial; potential: scalar; scale: hierarchy; vacuum state: energy; R symmetry; inflaton; inflation: slow-roll approximation; spontaneous symmetry breaking; cosmological model: parameter space; sgoldstino; sparticle; D-term; Supersymmetry; supergravity; inflation; Goldstein; gauged R-symmetry

Domaines: Astrophysique [astro-ph]; Physique des Hautes Energies - Phénoménologie [hep-ph]

Ignatios Antoniadis. Scale hierarchies, supersymmetry and cosmology. International Journal of Modern Physics A, 2018, 33 (34), pp.1845003. ⟨10.1142/S0217751X18450033⟩. ⟨hal-01982884⟩