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  Quantum cosmology from quantum gravity condensates: cosmological variables and latticerefined dynamics

Gielen, S., & Oriti, D. (2014). Quantum cosmology from quantum gravity condensates: cosmological variables and latticerefined dynamics. New Journal of Physics, 16: 123004. doi:10.1088/1367-2630/16/12/123004.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0023-CCCA-9 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-6D51-3
Genre: Journal Article

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1407.8167.pdf (Preprint), 173KB
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 Creators:
Gielen, Steffen1, Author              
Oriti, Daniele1, 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,High Energy Physics - Theory, hep-th
 Abstract: In the context of group field theory condensate cosmology, we clarify the extraction of cosmological variables from the microscopic quantum gravity degrees of freedom. We show that an important implication of the second quantized formalism is the dependence of cosmological variables and equations on the quantum gravitational atomic number N (number of spin network vertices/elementary simplices). We clarify the relation of the effective cosmological equations with loop quantum cosmology, understood as an effective (hydrodynamic-like) approximation of a more fundamental quantum gravity theory. By doing so, we provide a fundamental basis to the idea of lattice refinement, showing the dependence of the effective cosmological connection on N, and hence indirectly on the scale factor. Our results open a new arena for exploring effective cosmological dynamics, as this depends crucially on the new observable N, which is entirely of quantum gravitational origin.

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 Dates: 2014-07-302014
 Publication Status: Published in print
 Pages: 6 pages, APS style, revtex
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 Table of Contents: -
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 Identifiers: arXiv: 1407.8167
DOI: 10.1088/1367-2630/16/12/123004
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Title: New Journal of Physics
Source Genre: Journal
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Pages: - Volume / Issue: 16 Sequence Number: 123004 Start / End Page: - Identifier: -