We study inflation and preheating in F(R) supergravity characterized by two mass scales of a scalar degree of freedom (scalaron): M (associated with the inflationary era) and m (associated with the preheating era). The allowed values of the masses M and m are derived from the amplitude of the cosmic microwave background temperature anisotropies. We show that our model is consistent with the joint observational constraints of WMAP and other measurements in the regime where a sufficient amount of inflation (with the number of e-foldings larger than 50) is realized. In the low-energy regime relevant to preheating, we derive the effective scalar potential in the presence of a pseudoscalar field χ coupled to the inflaton (scalaron) field φ. If m is much larger than M, we find that there exists a preheating stage in which the field perturbations δχ and δφ rapidly grow by a broad parametric resonance.
|Journal||Physical Review D - Particles, Fields, Gravitation and Cosmology|
|Publication status||Published - 19 Jul 2012|
ASJC Scopus subject areas
- Nuclear and High Energy Physics