Journal
PHYSICAL REVIEW D
Volume 104, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.104.083525
Keywords
-
Ask authors/readers for more resources
Models of inflationary cosmology allow for a choice of metric where the geometry of homogeneous isotropic solutions becomes flat Minkowski space in the infinite past. The evolution is predominantly described by the slow increase of a scalar field which sets the scale of all masses. The primordial flat frame offers a new perspective on the physical properties of the inflationary universe.
Models of inflationary cosmology admit a choice of the metric for which the geometry of homogeneous isotropic solutions becomes flat Minkowski space in the infinite past. In this primordial flat frame all mass scales vanish in the infinite past and quantum scale symmetry is realized. The cosmological evolution is dominantly described by the slow increase of a scalar field which sets the scale of all masses. We construct the primordial flat frame for standard models of inflation as Starobinsky inflation or chaotic inflation. In particular, we discuss the evolution of inhomogeneous solutions in the neighborhood of the homogeneous isotropic background solution and their relation to the observable primordial fluctuation spectrum. If the propagators for the graviton and scalar field remain regular, our observed inhomogeneous universe can be extrapolated back to the infinite past in physical time. In this case there is no physical big-bang singularity-the latter reflects only a singular choice of field coordinates. Independently of the issue of singularity the primordial flat frame offers a new view on the physical properties of the inflationary universe, which can be characterized as a very slowly evolving almost empty vacuum state with approximate scale symmetry.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available