The perturbative Regge-calculus regime of Loop Quantum Gravity

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dc.creatorBianchi, Eugenio
dc.creatorModesto, Leonardo
dc.date2007-09-13
dc.date2007-12-11
dc.date.accessioned2026-07-07T11:19:18Z
dc.date.available2026-07-07T11:19:18Z
dc.descriptionThe relation between Loop Quantum Gravity and Regge calculus has been pointed out many times in the literature. In particular the large spin asymptotics of the Barrett-Crane vertex amplitude is known to be related to the Regge action. In this paper we study a semiclassical regime of Loop Quantum Gravity and show that it admits an effective description in terms of perturbative area-Regge-calculus. The regime of interest is identified by a class of states given by superpositions of four-valent spin networks, peaked on large spins. As a probe of the dynamics in this regime, we compute explicitly two- and three-area correlation functions at the vertex amplitude level. We find that they match with the ones computed perturbatively in area-Regge-calculus with a single 4-simplex, once a specific perturbative action and measure have been chosen in the Regge-calculus path integral. Correlations of other geometric operators and the existence of this regime for other models for the dynamics are briefly discussed.
dc.description43 pages, typos corrected, version accepted by Nucl.Phys.B
dc.identifierhttps://arxiv.org/abs/0709.2051
dc.identifierhttp://arxiv.org/abs/0709.2051
dc.identifierNucl.Phys.B796:581-621,2008
dc.identifierdoi:10.1016/j.nuclphysb.2007.12.011
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/193637
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Theory
dc.titleThe perturbative Regge-calculus regime of Loop Quantum Gravity
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