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http://hdl.handle.net/2289/5948
Title: | The Koslowski- Sahlmann representation: Gauge and diffeomorphism invariance. |
Authors: | Campiglia, Miguel Varadarajan, Madhavan |
Keywords: | Loop quantum gravity group averaging |
Issue Date: | 7-Apr-2014 |
Publisher: | IOP Publishing Ltd. |
Citation: | Classical and Quantum Gravity, 2014, Vol.31, p075002 |
Abstract: | The 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. |
Description: | Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations) |
URI: | http://hdl.handle.net/2289/5948 |
ISSN: | 0264-9381 1361-6382 (E) |
Alternative Location: | http://arxiv.org/abs/1311.6117 http://dx.doi.org/10.1088/0264-9381/31/7/075002 http://adsabs.harvard.edu/abs/2014CQGra..31g5002C |
Copyright: | 2014 IOP Publishing Ltd. |
Appears in Collections: | Research Papers (TP) |
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2014_CQG_31_075002.pdf Restricted Access | Restricted Access | 610.51 kB | Adobe PDF | View/Open Request a copy |
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