Theta vacuum in different gauges

Abstract

In some recent papers it is claimed that the physical significance of the vacuum angle theta for QCD-like theories depends on the chosen gauge condition. We criticise the arguments that were given in support of this claim, and show by explicit construction for the case of QED${}_2$ that and why they fail, confirming thereby the commonly accepted point of view.

Latex file, 12 pages

References in corpus (1)

• Massive Schwinger model within mass perturbation theory

Cited by in corpus (3)

• Tuning the Topological $\theta$-Angle in Cold-Atom Quantum Simulators of Gauge Theories
• Unconstrained SU(2) Yang-Mills Quantum Mechanics with Theta Angle
• The strong CP problem, general covariance, and horizons