https://doi.org/10.1140/epjc/s10052-017-5302-y
Regular Article - Theoretical Physics
Inflation from supersymmetry breaking
1
LPTHE, UMR CNRS 7589 Sorbonne Universités, UPMC Paris 6, 4 Place Jussieu, Paris, 75005, France
2
Albert Einstein Center, Institute for Theoretical Physics, University of Bern, Sidlerstrasse 5, Bern, 3012, Switzerland
3
Department of Physics, Faculty of Science, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok, 10330, Thailand
* e-mail: rob.k@chula.ac.th
Received:
29
June
2017
Accepted:
14
October
2017
Published online:
30
October
2017
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 
-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 [see pdf] and an inflation scale [see pdf] GeV. 
may be lowered up to electroweak energies only at the expense of fine-tuning the scalar potential.
© The Author(s), 2017
