English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

D = 2+1 gravity with a cosmological constant has been shown by Bonzom andLivine to present a Barbero-Immirzi like ambiguity depending on a parameter. Wemake use of this fact to show that, for positive cosmological constant, theLorentzian theory can be partially gauge fixed and reduced to an SU(2)Chern-Simons theory. We then review the already known quantization of thelatter in the framework of Loop Quantization for the case of space beingtopogically a cylinder. We finally construct, in the same setting, a quantumobservable which, although non-trivial at the quantum level, corresponds to anull classical quantity.

Quantization of Lorentzian 3d Gravity by Partial Gauge Fixing