Infrared logarithms in minisuperspace inflation
Review articleOpen access
Ali Kaya - No affiliation found
2018/07/10 Short communication DOI: 10.1016/j.physletb.2018.05.045
Journal: Physics Letters B
AbstractWe examine the emergence of the infrared logarithms in the cosmological perturbation theory applied to the minisuperspace scalar slow-roll inflation. Not surprisingly, in the single scalar field model the curvature perturbation ζ is conserved and no lnaB behavior appears, where aB(t) is the background scale factor of the universe. On the other hand, in the presence of a spectator scalar the n'th order perturbation theory gives an (lnaB)n correction to ζ. However, a nonperturbative estimate shows that ζ actually becomes the sum of a constant and a mildly evolving lnaB pieces.
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