On UV/IR mixing in noncommutative gauge field theories

TL;DR

This paper investigates UV/IR mixing in noncommutative gauge theories, demonstrating that most divergences can be removed in a theta-exact approach, with one divergence remaining linked to the extended nature of particles.

Contribution

It provides an explicit calculation of neutral fermion self-energy in noncommutative QED, showing most divergences can be eliminated in a theta-exact framework.

Findings

Most divergences in neutral fermion self-energy are removable.

Remaining divergence is associated with the pointlike limit of extended particles.

UV/IR mixing persists but can be controlled in a theta-exact approach.

Abstract

In formulating gauge field theories on noncommutative (NC) spaces it is suggested that particles carrying gauge invariant quantities should not be viewed as pointlike, but rather as extended objects whose sizes grow linearly with their momenta. This and other generic properties deriving from the nonlocal character of interactions (showing thus unambiguously their quantum-gravity origin) lead to a specific form of UV/IR mixing as well as to a pathological behavior at the quantum level when the noncommutativity parameter theta is set to be arbitrarily small. In spite of previous suggestions that in a NC gauge theory based on the theta-expanded Seiberg-Witten (SW) maps UV/IR mixing effects may be under control, a fairly recent study of photon self-energy within a SW theta-exact approach has shown that UV/IR mixing is still present. We study the self-energy contribution for neutral fermions in the theta-exact approach of NC QED, and show by explicit calculation that all but one divergence can be eliminated for a generic choice of the noncommutativity parameter theta. The remaining divergence is linked to the pointlike limit of an extended object.