String Geometry and the Noncommutative Torus

TL;DR

This paper develops a new gauge theory on noncommutative tori, linking noncommutative geometry with string dualities, and introduces duality-symmetric actions with novel particle-antiparticle duality features.

Contribution

It constructs a gauge theory on noncommutative tori derived from lattice vertex operator algebras, establishing Morita equivalences and physical interpretations via string dualities.

Findings

Constructed gauge theories invariant under automorphisms.

Derived duality-symmetric bosonic and fermionic actions.

Identified a new particle-antiparticle duality enabling instanton solutions.

Abstract

We construct a new gauge theory on a pair of d-dimensional noncommutative tori. The latter comes from an intimate relationship between the noncommutative geometry associated with a lattice vertex operator algebra A and the noncommutative torus. We show that the (truncated) tachyon subalgebra of A is naturally isomorphic to a class of twisted modules representing quantum deformations of the algebra of functions on the torus. We construct the corresponding even real spectral triples and determine their Morita equivalence classes using string duality arguments. These constructions yield simple proofs of the O(d,d;Z) Morita equivalences between $d$-dimensional noncommutative tori and give a natural physical interpretation of them in terms of the target space duality group of toroidally compactified string theory. We classify the automorphisms of the twisted modules and construct the most general gauge theory which is invariant under the automorphism group. We compute bosonic and fermionic actions associated with these gauge theories and show that they are explicitly duality-symmetric. The duality-invariant gauge theory is manifestly covariant but contains highly non-local interactions. We show that it also admits a new sort of particle-antiparticle duality which enables the construction of instanton field configurations in any dimension. The duality non-symmetric on-shell projection of the field theory is shown to coincide with the standard non-abelian Yang-Mills gauge theory minimally coupled to massive Dirac fermion fields.