Canonical linearized Regge Calculus: counting lattice gravitons with Pachner moves

TL;DR

This paper systematically analyzes the linearized canonical dynamics of 4D Regge Calculus using Pachner moves, identifying gauge invariances and counting lattice gravitons as curvature degrees of freedom.

Contribution

It provides a comprehensive method to count and understand gauge and graviton degrees of freedom in linearized Regge Calculus via Pachner moves.

Findings

Pachner moves generate gauge and graviton degrees of freedom.

The 2-3 move creates a graviton; the 3-2 move removes one.

The 1-4 and 4-1 moves generate and remove lapse, shift, and symmetry variables.

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 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.