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  Holonomy spin foam models: Asymptotic geometry of the partition function

Hellmann, F., & Kaminski, W. (2013). Holonomy spin foam models: Asymptotic geometry of the partition function. Journal of high energy physics: JHEP, 2013(10): 165. doi:10.1007/JHEP10(2013)165.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0014-A8F6-A Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0015-11B1-7
Genre: Journal Article

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 Creators:
Hellmann, Frank1, Author              
Kaminski, Wojciech, Author
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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,High Energy Physics - Lattice, hep-lat
 Abstract: We study the asymptotic geometry of the spin foam partition function for a large class of models, including the models of Barrett and Crane, Engle, Pereira, Rovelli and Livine, and, Freidel and Krasnov. The asymptotics is taken with respect to the boundary spins only, no assumption of large spins is made in the interior. We give a sufficient criterion for the existence of the partition function. We find that geometric boundary data is suppressed unless its interior continuation satisfies certain accidental curvature constraints. This means in particular that most Regge manifolds are suppressed in the asymptotic regime. We discuss this explicitly for the case of the configurations arising in the 3-3 Pachner move. We identify the origin of these accidental curvature constraints as an incorrect twisting of the face amplitude upon introduction of the Immirzi parameter and propose a way to resolve this problem, albeit at the price of losing the connection to the SU(2) boundary Hilbert space. The key methodological innovation that enables these results is the introduction of the notion of wave front sets, and the adaptation of tools for their study from micro local analysis to the case of spin foam partition functions.

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 Dates: 2013-07-052013-07-142013
 Publication Status: Published in print
 Pages: 63 pages, 5 figures v2: Reference corrected
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1307.1679
DOI: 10.1007/JHEP10(2013)165
 Degree: -

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Title: Journal of high energy physics : JHEP
Source Genre: Journal
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Publ. Info: Bologna, Italy : Società italiana di fisica
Pages: - Volume / Issue: 2013 (10) Sequence Number: 165 Start / End Page: - Identifier: ISSN: 1126-6708
CoNE: /journals/resource/111021927548002