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

Warning

This publication doesn't include Institute of Computer Science. It includes Faculty of Science. Official publication website can be found on muni.cz.

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.
Related projects:	Ústav Eduarda Čecha pro algebru, geometrii a matematickou fyziku