IR-Divergence and Anomalous Temperature Dependence of the Condensate in the Quenched Schwinger Model

Abstract

The Schwinger model is used to study the artifacts of quenching in a controlled way. The model is solved on a finite-temperature cylinder of circumference $\beta =1/T$ with bag-inspired local boundary conditions at the two ends $x^1=0$ and $x^1=L$ which break the ${\gamma }_5$-invariance and thus play the role of a small quark mass. The quenched chiral condensate is found to diverge exponentially as $L\to \infty$, and to diverge (rather than melt as for $N_{\mathrm{f}}\ge 1$) if the high-temperature limit $\beta \to 0$ is taken at finite box-length $L$. We comment on the generalization of our results to the massive quenched theory, arguing that the condensate is finite as $L\to \infty$ and proportional to $1/m$ up to logarithms.

Comments: Revtex, 15pp, 1 figure; two references corrected, to appear in Phys. Rev. D