Divergences in Non-Commutative Gauge Theories with the Slavnov Term

Abstract

The divergence structure of non-commutative gauge field theories (NCGFT) with a Slavnov extension is examined at one-loop level with main focus on the gauge boson self-energy. Using an interpolating gauge we show that even with this extension the quadratic IR divergence of the gauge boson self-energy is independent from a covariant gauge fixing as well as from an axial gauge. The proposal of Slavnov is based on the fact that the photon propagator shows a new transversality condition with respect to the IR dangerous terms. This novel transversality is implemented with the help of a new dynamical multiplier field. However, one expects that in physical observables such contributions disappear. A further new feature is the existence of new UV divergences compatible with the gauge invariance (BRST symmetry). We then examine two explicit models with couplings to fermions and scalar fields.

31 pages, 7 figures, 4 tables; v2 abstract rewritten & minor corrections, published version

References in corpus (2)

• Noncommutative Quantum Cosmology
• Gauge Independence of IR singularities in Non-Commutative QFT - and Interpolating Gauges

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