On the initial conditions for inflation with plateau potentials: the R plus R-2 (super)gravity case

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Authors

DALIANIS Ioannis FARAKOS Fotis

Year of publication 2015
Type Article in Periodical
Magazine / Source JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
MU Faculty or unit

Faculty of Science

Citation
Web Journal website
Field Theoretical physics
Keywords HIGHER-DERIVATIVE SUPERGRAVITY; MINIMAL SUPERGRAVITY; AUXILIARY FIELDS; MODELS; UNIVERSE; MATTER; PARADIGM
Description We discuss the initial conditions problem for inflation driven by the vacuum energy of a plateau potential, and in particular the Starobinsky inflation. We show that the supergravity embedding of the R+R2 theory naturally decreases the size of the acausal homogeneity, required for the low-scale inflation to occur, thanks to the presence of the dynamical pure supergravitational ``auxiliary'' fields. We examine the evolution of the R+R2 fields within a FLRW Universe. We also find a dependence of the initial conditions problem on the background spatial curvature.
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