Universität zu Köln

Brizuela, David, Kiefer, Claus ORCID: 0000-0001-6163-9519 and Kramer, Manuel ORCID: 0000-0002-4442-277X (2016). Quantum-gravitational effects on gauge-invariant scalar and tensor perturbations during inflation: The slow-roll approximation. Phys. Rev. D, 94 (12). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2470-0029

Full text not available from this repository.

Abstract

We continue our study on corrections from canonical quantum gravity to the power spectra of gauge-invariant inflationary scalar and tensor perturbations. A direct canonical quantization of a perturbed inflationary universe model is implemented, which leads to a Wheeler-DeWitt equation. For this equation, a semiclassical approximation is applied in order to obtain a Schrodinger equation with quantum-gravitational correction terms, from which we calculate the corrections to the power spectra. We go beyond the de Sitter case discussed earlier and analyze our model in the first slow-roll approximation, considering terms linear in the slow-roll parameters. We find that the dominant correction term from the de Sitter case, which leads to an enhancement of power on the largest scales, gets modified by terms proportional to the slow-roll parameters. A correction to the tensor-to-scalar ratio is also found at second order in the slow-roll parameters. Making use of the available experimental data, the magnitude of these quantum-gravitational corrections is estimated. Finally, the effects for the temperature anisotropies in the cosmic microwave background are qualitatively obtained.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Brizuela, David UNSPECIFIED UNSPECIFIED UNSPECIFIED Kiefer, Claus UNSPECIFIED orcid.org/0000-0001-6163-9519 UNSPECIFIED Kramer, Manuel UNSPECIFIED orcid.org/0000-0002-4442-277X UNSPECIFIED
URN:	urn:nbn:de:hbz:38-252173
DOI:	10.1103/PhysRevD.94.123527
Journal or Publication Title:	Phys. Rev. D
Volume:	94
Number:	12
Date:	2016
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2470-0029
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute for Theoretical Physics
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language GRAVITY Multiple languages Astronomy & Astrophysics; Physics, Particles & Fields Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/25217