2014/07/31 by Philipp A. Hoehn
Physics and Astronomy · Mathematics · #math-ph #gr-qc #hep-lat #math.MP
paper · pdf · doi:10.1063/1.4900926
published as J. Math. Phys. 55, 113506 (2014) · 36 pages, 7 figures, 1 table, minor modifications, matches published version
arxiv created 2014/11/13 · arxiv updated 2014/11/14
We provide a comprehensive classification of constraints and degrees of freedom for variational discrete systems governed by quadratic actions. This classification is based on the different types of null vectors of the Lagrangian two-form and employs the canonical formalism developed in arXiv:1303.4294 [math-ph] (J. Math. Phys. 54, 093505 (2013)) and arXiv:1401.6062 [gr-qc] (J. Math. Phys. 55, 083508 (2014)). The analysis is carried out in both the classical and quantum theory and applies to systems with both temporally varying or constant discretization. In particular, it is shown explicitly how changes in the discretization, e.g. resulting from canonical coarse graining or refining operations or an evolving background geometry, change the dynamical content of the system. It is demonstrated how, on a temporally varying discretization, constraints, Dirac observables, symmetries, reduced phase spaces and physical Hilbert spaces become spacetime region dependent. These results are relevant for free field theory on an evolving lattice and linearized discrete gravity models.