Signature of supersymmetry from the early universe
Abstract
Supersymmetry plays a fundamental role in the radiative stability of many inflationary models. Spontaneous breaking of the symmetry inevitably leads to fields with masses of order the Hubble scale during inflation. When these fields couple to the inflaton, they produce a unique signature in the squeezed limit of the threepoint function of primordial curvature perturbations. In this paper, we make this connection between naturalness, supersymmetry, Hubblemass degrees of freedom, and the squeezed limit precise. To study the physics in a modelinsensitive way, we develop a supersymmetric effective theory of inflation. We use the effective theory to classify all possible interactions between the inflaton and the additional fields, and determine which ones naturally allow large nonGaussianities when protected by supersymmetry. Finally, we discuss the tantalizing prospect of using cosmological observations as a probe of supersymmetry.
 Publication:

Physical Review D
 Pub Date:
 May 2012
 DOI:
 10.1103/PhysRevD.85.103520
 arXiv:
 arXiv:1109.0292
 Bibcode:
 2012PhRvD..85j3520B
 Keywords:

 98.80.Cq;
 Particletheory and fieldtheory models of the early Universe;
 High Energy Physics  Theory;
 Astrophysics  Cosmology and Extragalactic Astrophysics;
 High Energy Physics  Phenomenology
 EPrint:
 41 pages, v2: References added. Improved discussion of mixing terms