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- W95786999 abstract "We afford a systematic and comprehensive account of the canonical dynamics of 4D Regge calculus perturbatively expanded to linear order around a flat background. To this end, we consider the Pachner moves which generate the most basic and general simplicial evolution scheme. The linearized regime features a vertex displacement (diffeomorphism) symmetry for which we derive an Abelian constraint algebra. This permits us to identify gauge invariant lattice ``gravitons'' as propagating curvature degrees of freedom. The Pachner moves admit a simple method to explicitly count the gauge and graviton degrees of freedom on an evolving triangulated hypersurface, and we clarify the distinct role of each move in the dynamics. It is shown that the 1--4 move generates four ``lapse and shift'' variables and four conjugate vertex displacement generators; the 2--3 move generates a graviton; the 3--2 move removes one graviton and produces the only non-trivial equation of motion; and the 4--1 move removes four lapse and shift variables and trivializes the four conjugate symmetry generators. It is further shown that the Pachner moves preserve the vertex displacement generators. These results may provide new impetus for exploring `graviton dynamics' in discrete quantum gravity models." @default.
- W95786999 created "2016-06-24" @default.
- W95786999 creator A5006232432 @default.
- W95786999 date "2015-06-10" @default.
- W95786999 modified "2023-09-23" @default.
- W95786999 title "Canonical linearized Regge calculus: Counting lattice gravitons with Pachner moves" @default.
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- W95786999 doi "https://doi.org/10.1103/physrevd.91.124034" @default.
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