Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
1996-04-15
J.Geom.Phys. 24 (1998) 353-385
Physics
High Energy Physics
High Energy Physics - Lattice
34 pages, Latex, Minor corrections, Section 6 corrected
Scientific paper
10.1016/S0393-0440(97)00017-X
Conventional approaches to lattice gauge theories do not properly consider the topology of spacetime or of its fields. In this paper, we develop a formulation which tries to remedy this defect. It starts from a cubical decomposition of the supporting manifold (compactified spacetime or spatial slice) interpreting it as a finite topological approximation in the sense of Sorkin. This finite space is entirely described by the algebra of cochains with the cup product. The methods of Connes and Lott are then used to develop gauge theories on this algebra and to derive Wilson's actions for the gauge and Dirac fields therefrom which can now be given geometrical meaning. We also describe very natural candidates for the QCD theta term and Chern-Simons action suggested by this algebraic formulation. Some of these formulations are simpler than currently available alternatives. The paper treats both the functional integral and Hamiltonian approaches.
Balachandran Aiyalam P.
Bimonte Giuseppe
Landi Giovanni
Lizzi Fedele
Teotonio-Sobrinho Paulo
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