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  Separate universes in loop quantum cosmology: framework and applications

Wilson-Ewing, E. (2016). Separate universes in loop quantum cosmology: framework and applications. International Journal of Modern Physics D, 25(8): 1642002. doi:10.1142/S0218271816420025.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-70FF-9 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-0220-6
Genre: Journal Article

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1512.05743.pdf (Preprint), 247KB
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 Creators:
Wilson-Ewing, Edward1, Author              
Affiliations:
1Quantum Gravity & Unified Theories, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_24014              

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Free keywords: General Relativity and Quantum Cosmology, gr-qc
 Abstract: I present a streamlined review of how the separate universe approach to cosmological perturbation theory can be used to study the dynamics of long-wavelength scalar perturbations in loop quantum cosmology, and then use it to calculate how long-wavelength curvature perturbations evolve across the loop quantum cosmology bounce assuming a constant equation of state. A similar calculation is possible for tensor modes using results from a complementary approach to cosmological perturbation theory in loop quantum cosmology based on an effective Hamiltonian constraint. An interesting result is that the tensor-to-scalar ratio can be suppressed or amplified by quantum gravity effects during the bounce, depending on the equation of state of the matter field dominating the dynamics. In particular, if the equation of state lies between -1/3 and 1, the value of the tensor-to-scalar ratio will be suppressed during the bounce, in some cases significantly.

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 Dates: 2015-12-172016-04-25201620162016
 Publication Status: Published in print
 Pages: 13 pages, v2: Title changed, clarifications and references added. Prepared for submission to IJMPD special issue on Loop Quantum Cosmology
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 Identifiers: arXiv: 1512.05743
URI: http://arxiv.org/abs/1512.05743
DOI: 10.1142/S0218271816420025
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Title: International Journal of Modern Physics D
  Other : Int. J. Mod. Phys. D
Source Genre: Journal
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Publ. Info: Singapore : World Scientific
Pages: - Volume / Issue: 25 (8) Sequence Number: 1642002 Start / End Page: - Identifier: ISSN: 0218-2718
CoNE: /journals/resource/954925493947