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  Inflationary observables in loop quantum cosmology

Bojowald, M., & Calcagni, G. (2011). Inflationary observables in loop quantum cosmology. Journal of Cosmology and Astroparticle Physics, 2011(3): 032. doi:10.1088/1475-7516/2011/03/032.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0012-D158-9 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0012-D15A-5
Genre: Journal Article

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1011.2779 (Preprint), 365KB
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 Creators:
Bojowald, Martin, Author
Calcagni, Gianluca1, Author              
Affiliations:
1Microscopic Quantum Structure & Dynamics of Spacetime, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_67201              

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Free keywords: General Relativity and Quantum Cosmology, gr-qc,Astrophysics, Cosmology and Extragalactic Astrophysics, astro-ph.CO,High Energy Physics - Theory, hep-th
 Abstract: The full set of cosmological observables coming from linear scalar and tensor perturbations of loop quantum cosmology is computed in the presence of inverse-volume corrections. Background inflationary solutions are found at linear order in the quantum corrections; depending on the values of quantization parameters, they obey an exact or perturbed power-law expansion in conformal time. The comoving curvature perturbation is shown to be conserved at large scales, just as in the classical case. Its associated Mukhanov equation is obtained and solved. Combined with the results for tensor modes, this yields the scalar and tensor indices, their running, and the tensor-to-scalar ratio, which are all first order in the quantum correction. The latter could be sizable in phenomenological scenarios. Contrary to a pure minisuperspace parametrization, the lattice refinement parametrization is in agreement with both anomaly cancellation and our results on background solutions and linear perturbations. The issue of the choice of parametrization is also discussed in relation with a possible superluminal propagation of perturbative modes, and conclusions for quantum spacetime structure are drawn.

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 Dates: 2010-11-112011
 Publication Status: Published in print
 Pages: 40 pages
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1011.2779
URI: http://arxiv.org/abs/1011.2779
DOI: 10.1088/1475-7516/2011/03/032
 Degree: -

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Title: Journal of Cosmology and Astroparticle Physics
Source Genre: Journal
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Publ. Info: Bristol, England : Institute of Physics Pub.
Pages: - Volume / Issue: 2011 (3) Sequence Number: 032 Start / End Page: - Identifier: ISSN: 1475-7516
CoNE: /journals/resource/111055183238000_1