# 4th ComHEP: Colombian Meeting on High Energy Physics (Barranquilla, Colombia)

2-6 December 2019
Centro Cultural, Universidad del Atlántico
America/Bogota timezone

## Spontaneous Breaking and Flat directions in Supersymmetry

2 Dec 2019, 16:30
20m
Teatrino 1 (Centro Cultural, Universidad del Atlántico)

### Teatrino 1

#### Centro Cultural, Universidad del Atlántico

Universidad del Atlántico Carrera 30 No. 8-49 Puerto Colombia, Atlántico
Talk

### Speaker

Diana Garcia Sandoval (Universidad Nacional de Colombia)

### Description

In order to reproduce the CMB density fluctuations, inflationary models require an inflaton scalar field $\phi$ such that the potential is sufficiently flat near $\phi=0$, and acquires a large curvature around the minimum. In supersymmetric models these flat directions appear naturally in the superpotentials, finding conditions on the fields so the $F$ and $D$ terms are zero. On the other hand, when supersymmetry is spontaneously broken, these directions gain a large enough curvature to produce the field oscillations required in the inflationary scenario. The supersymmetric formalism is constructed from a Super-poincaré symmetry group composed by a Poincaré Subgroup and a fermionic symmetry subgroup, and it's algebra is given by Coleman-Mandula and Haag-Lopuszanski Sohnius theorems. The representations on fields are obtained through the coset Super-Poincaré/Lorentz and the Lagrangians for scalar and vector fields can be constructed. Hereinafter, conditions for spontaneous breaking of Supersymmetry in the Wess-Zumino, O'Raifertaigh and Fayet-Illiopoulos models are analyzed in order to obtain the mass-spectra of the fields involved. Finally, two simple superpotentials for the inflaton are showed to fulfill asymptotic behaviour that could give rise to inflation.

### Primary authors

Diana Garcia Sandoval (Universidad Nacional de Colombia) Roberto Martinez (Universidad Nacional de Colombia)