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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/5948
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dc.contributor.authorCampiglia, Miguel-
dc.contributor.authorVaradarajan, Madhavan-
dc.date.accessioned2014-08-07T06:27:03Z-
dc.date.available2014-08-07T06:27:03Z-
dc.date.issued2014-04-07-
dc.identifier.citationClassical and Quantum Gravity, 2014, Vol.31, p075002en
dc.identifier.issn0264-9381-
dc.identifier.issn1361-6382 (E)-
dc.identifier.urihttp://hdl.handle.net/2289/5948-
dc.descriptionRestricted Access. An open-access version is available at arXiv.org (one of the alternative locations)en
dc.description.abstractThe discrete spatial geometry underlying loop quantum gravity (LQG) is degenerate almost everywhere. This is at apparent odds with the non-degeneracy of asymptotically flat metrics near spatial infinity. Koslowski generalized the LQG representation so as to describe states labeled by smooth non-degenerate triad fields. His representation was further studied by Sahlmann with a view to imposing gauge and spatial diffeomorphism invariance through group averaging methods. Motivated by the desire to model asymptotically flat quantum geometry by states with triad labels which are non-degenerate at infinity but not necessarily so in the interior, we initiate a generalization of Sahlmann's considerations to triads of varying degeneracy. In doing so, we include delicate phase contributions to the averaging procedure which are crucial for the correct implementation of the gauge and diffeomorphism constraints, and whose existence can be traced to the background exponential functions recently constructed by one of us. Our treatment emphasizes the role of symmetries of quantum states in the averaging procedure. Semianalyticity, influential in the proofs of the beautiful uniqueness results for LQG, plays a key role in our considerations. As a by product, we re-derive the group averaging map for standard LQG, highlighting the role of state symmetries and explicitly exhibiting the essential uniqueness of its specification.en
dc.language.isoenen
dc.publisherIOP Publishing Ltd.en
dc.relation.urihttp://arxiv.org/abs/1311.6117en
dc.relation.urihttp://dx.doi.org/10.1088/0264-9381/31/7/075002en
dc.relation.urihttp://adsabs.harvard.edu/abs/2014CQGra..31g5002Cen
dc.rights2014 IOP Publishing Ltd.en
dc.subjectLoop quantum gravityen
dc.subjectgroup averagingen
dc.titleThe Koslowski- Sahlmann representation: Gauge and diffeomorphism invariance.en
dc.typeArticleen
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