English

Item

ITEM ACTIONSEXPORT
Observational test of inflation in loop quantum cosmology

Bojowald, M., Calcagni, G., & Tsujikawa, S. (2011). Observational test of inflation in loop quantum cosmology. Journal of Cosmology and Astroparticle Physics, 11: 046. doi:10.1088/1475-7516/2011/11/046.

Item is

Basic

show hide
Genre: Journal Article

Files

show Files
hide Files
:
1107.1540 (Preprint), 379KB
Name:
1107.1540
Description:
Visibility:
Public
MIME-Type / Checksum:
application/pdf / [MD5]
-
-
:
JCAP_2011_11_046.pdf (Any fulltext), 470KB
-
Name:
JCAP_2011_11_046.pdf
Description:
-
Visibility:
Public
MIME-Type / Checksum:
application/pdf / [MD5]
-
-
-

show

Creators

show
hide
Creators:
Bojowald, Martin, Author
Calcagni, Gianluca1, Author
Tsujikawa, Shinji, Author
Affiliations:
1Microscopic Quantum Structure & Dynamics of Spacetime, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_67201

Content

show
hide
Free keywords: General Relativity and Quantum Cosmology, gr-qc,Astrophysics, Cosmology and Extragalactic Astrophysics, astro-ph.CO,High Energy Physics - Theory, hep-th
Abstract: We study in detail the power spectra of scalar and tensor perturbations generated during inflation in loop quantum cosmology (LQC). After clarifying in a novel quantitative way how inverse-volume corrections arise in inhomogeneous settings, we show that they can generate large running spectral indices, which generally lead to an enhancement of power at large scales. We provide explicit formulas for the scalar/tensor power spectra under the slow-roll approximation, by taking into account corrections of order higher than the runnings. We place observational bounds on the inverse-volume quantum correction \delta ~ a^{- \sigma} (\sigma >0, $a$ is the scale factor) and the slow-roll parameter \epsilon_V for power-law potentials as well as exponential potentials by using the data of WMAP 7yr combined with other observations. We derive the constraints on \delta for two pivot wavenumbers k_0 for several values of \delta. The quadratic potential can be compatible with the data even in the presence of the LQC corrections, but the quartic potential is in tension with observations. We also find that the upper bounds on \delta (k_0) for given \sigma and k_0 are insensitive to the choice of the inflaton potentials.

Details

show
hide
Language(s):
Dates: 2011-07-072011
Publication Status: Published in print
Pages: 1+36 pages, 6 figures, 1 table
Publishing info: -
Rev. Method: -
Identifiers: arXiv: 1107.1540
DOI: 10.1088/1475-7516/2011/11/046
Degree: -

show

show

show

Source 1

show
hide
Title: Journal of Cosmology and Astroparticle Physics
Source Genre: Journal
Creator(s):
Affiliations:
Publ. Info: Bristol, England : Institute of Physics Pub.
Pages: - Volume / Issue: 11 Sequence Number: 046 Start / End Page: - Identifier: ISSN: 1475-7516
CoNE: https://pure.mpg.de/cone/journals/resource/111055183238000_1