Coherent states for quantum gravity: towards collective variables
arXiv:1202.0526 · doi:10.1088/0264-9381/29/13/135002
Abstract
We investigate the construction of coherent states for quantum theories of connections based on graphs embedded in a spatial manifold, as in loop quantum gravity. We discuss the many subtleties of the construction, mainly related to the diffeomorphism invariance of the theory. Aiming at approximating a continuum geometry in terms of discrete, graph-based data, we focus on coherent states for collective observables characterizing both the intrinsic and extrinsic geometry of the hypersurface, and we argue that one needs to revise accordingly the more local definitions of coherent states considered in the literature so far. In order to clarify the concepts introduced, we work through a concrete example that we hope will be useful to applying coherent state techniques to cosmology.
25 pages, 1 figure
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- Group Field Theory and Holographic Tensor Networks: Dynamical Corrections to the Ryu-Takayanagi formula
- Nilpotent Symmetries in Super-Group Field Cosmology
- Coherent State Operators in Loop Quantum Gravity
- On the space of generalized fluxes for loop quantum gravity
- Semiclassical states in quantum gravity: Curvature associated to a Voronoi graph
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