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Title:
Formation and Evolution of Structure in Loop Cosmology
Authors:
Bojowald, Martin; Kagan, Mikhail; Singh, Parampreet; Hernández, Hector H.; Skirzewski, Aureliano
Affiliation:
AA(Institute for Gravitational Physics and Geometry, The Pennsylvania State University, 104 Davey Lab, University Park, Pennsylvania 16802, USA), AB(Institute for Gravitational Physics and Geometry, The Pennsylvania State University, 104 Davey Lab, University Park, Pennsylvania 16802, USA), AC(Institute for Gravitational Physics and Geometry, The Pennsylvania State University, 104 Davey Lab, University Park, Pennsylvania 16802, USA), AA(Max-Planck-Institut für Gravitationsphysik, Albert-Einstein-Institut, Am Mühlenberg 1, D-14476 Potsdam, Germany), AB(Max-Planck-Institut für Gravitationsphysik, Albert-Einstein-Institut, Am Mühlenberg 1, D-14476 Potsdam, Germany)
Publication:
Physical Review Letters, vol. 98, Issue 3, id. 031301 (PhRvL Homepage)
Publication Date:
01/2007
Origin:
APS
PACS Keywords:
Particle-theory and field-theory models of the early Universe, Loop quantum gravity, quantum geometry, spin foams
DOI:
10.1103/PhysRevLett.98.031301
Bibliographic Code:
2007PhRvL..98c1301B

Abstract

Inhomogeneous cosmological perturbation equations are derived in loop quantum gravity, taking into account corrections, in particular, in gravitational parts. This provides a framework for calculating the evolution of modes in structure formation scenarios related to inflationary or bouncing models. Applications here are corrections to the Newton potential and to the evolution of large scale modes which imply nonconservation of curvature perturbations possibly noticeable in a running spectral index. These effects are sensitive to quantization procedures and test the characteristic behavior of correction terms derived from quantum gravity.
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