Dynamics for QCD on an infinite lattice

TL;DR

This paper establishes the existence of a well-defined global dynamics and ground states for quantum chromodynamics (QCD) on an infinite lattice within a C*-algebra framework, extending finite lattice models.

Contribution

It constructs a rigorous C*-algebraic framework for infinite lattice QCD, proving the existence of dynamics automorphisms and gauge-invariant ground states.

Findings

Existence of a global time evolution automorphism group.

Construction of gauge-invariant ground states.

Representation of the infinite lattice field algebra.

Abstract

We prove the existence of the dynamics automorphism group for Hamiltonian QCD on an infinite lattice in R^3, and this is done in a C*-algebraic context. The existence of ground states is also obtained. Starting with the finite lattice model for Hamiltonian QCD developed by Kijowski & Rudolph, we state its field algebra and a natural representation. We then generalize this representation to the infinite lattice, and construct a Hilbert space which has represented on it all the local algebras (i.e. kinematics algebras associated with finite connected sublattices) equipped with the correct graded commutation relations. On a suitably large C*-algebra acting on this Hilbert space, and containing all the local algebras, we prove that there is a one parameter automorphism group, which is the pointwise norm limit of the local time evolutions along a sequence of finite sublattices, increasing to the full lattice. This is our global time evolution. We then take as our field algebra the C*-algebra generated by all the orbits of the local algebras w.r.t. the global time evolution. Thus the time evolution creates the field algebra. The time evolution is strongly continuous on this choice of field algebra, though not on the original larger C*-algebra. We define the gauge transformations, explain how to enforce the Gauss law constraint, show that the dynamics automorphism group descends to the algebra of physical observables and prove that gauge invariant ground states exist.