Inflation from supersymmetry breaking

Antoniadis, Ignatios; Chatrabhuti, A.; Isono, H.; Knoops, R. (2017). Inflation from supersymmetry breaking. European physical journal. C - particles and fields, 77(11), p. 724. EDP Sciences 10.1140/epjc/s10052-017-5302-y

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We explore the possibility that inflation is driven by supersymmetry breaking with the superpartner of the goldstino (sgoldstino) playing the role of the inflaton. More- over, we impose an R-symmetry that allows one 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 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 stud- ied recently by the present authors, with the inflaton iden- tified 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 10¹⁰ GeV ≲ H∗ ≲ 10¹² GeV. H∗ may be lowered up to electroweak energies only at the expense of fine-tuning the scalar potential.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)
08 Faculty of Science > Institute of Theoretical Physics

UniBE Contributor:

Antoniadis, Ignatios

Subjects:

500 Science > 530 Physics

ISSN:

1434-6044

Publisher:

EDP Sciences

Language:

English

Submitter:

Esther Fiechter

Date Deposited:

13 Dec 2017 13:56

Last Modified:

28 Oct 2019 21:40

Publisher DOI:

10.1140/epjc/s10052-017-5302-y

ArXiv ID:

1706.04133

BORIS DOI:

10.7892/boris.107086

URI:

https://boris.unibe.ch/id/eprint/107086

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