We discuss how the modifications of standard Einstein’s equations needed to support cosmological bounce can at same time lead vanishing well known constant problem, while also studying effects spacetime fluctuations. first concentrate on case classical Friedmann–Lemaître–Robertson–Walker (FLRW) and show that in a bouncing cosmology, where modification Einstein–Hilbert action be represented by m...

Abstract In construction of an inflationary model, one usually assumes that the matter sector gravitational action is minimally coupled to background. It means (inflaton) part with same metric part. We elaborate on this assumption and investigate some consequences. assume inflaton sectors belong different units (or conformal frames). show coupling can convert a single-field model into two-field...