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