Cosmological Footprints of Loop Quantum Gravity
Abstract
The primordial spectrum of cosmological tensor perturbations is considered as a possible probe of quantum gravity effects. Together with string theory, loop quantum gravity is one of the most promising frameworks to study quantum effects in the early universe. We show that the associated corrections should modify the potential seen by gravitational waves during the inflationary amplification. The resulting power spectrum should exhibit a characteristic tilt. This opens a new window for cosmological tests of quantum gravity.
 Publication:

Physical Review Letters
 Pub Date:
 February 2009
 DOI:
 10.1103/PhysRevLett.102.081301
 arXiv:
 arXiv:0902.0145
 Bibcode:
 2009PhRvL.102h1301G
 Keywords:

 04.60.Bc;
 04.60.Pp;
 98.80.Cq;
 98.80.Qc;
 Phenomenology of quantum gravity;
 Loop quantum gravity quantum geometry spin foams;
 Particletheory and fieldtheory models of the early Universe;
 Quantum cosmology;
 General Relativity and Quantum Cosmology;
 Astrophysics  Cosmology and Extragalactic Astrophysics;
 High Energy Physics  Phenomenology;
 High Energy Physics  Theory;
 Quantum Physics
 EPrint:
 Accepted by Phys. Rev. Lett., 7 pages, 2 figures