Breaking Scale Invariance with Quantum Gravity
Abstract
It is argued that the closed, nonsingular cosmological model of Starobinsky (1980) allows a selfconsistent, albeit schematic, description of the history of the universe from its beginning to now and even provides, given a suitable scenario, the possibility of breaking in a natural way the scale invariance of the perturbation spectrum. A double inflationary scenario is specified in detail to explain the anomalous power observed in the largescale astronomical structures by assuming that the first inflation is driven by quantum gravity and that the second inflation is driven by the usual inflation. An example of a power spectrum where the scale invariance has been broken and extra power is put above 10 Mpc is presented. The model is now compatible with the observed upper limits from the large angular scale isotropy of the microwave background.
 Publication:

The Astrophysical Journal
 Pub Date:
 February 1990
 DOI:
 10.1086/168323
 Bibcode:
 1990ApJ...349..399A
 Keywords:

 Cosmology;
 Gravitation Theory;
 Quantum Theory;
 Astronomical Models;
 Universe;
 Astrophysics;
 COSMOLOGY;
 EARLY UNIVERSE;
 GRAVITATION