Index-like Theorem for Massless Fermions in Spherically Symmetric Monopole Backgrounds

Abstract

In this paper we study massless fermions coupled to spherically symmetric $SU(N)$ monopoles without Yukawa couplings between the Higgs and fermion fields. The corresponding Dirac operator is not Fredholm and the associated eigenfunctions are not $L^2$-normalizable. Here we derive a formula for the dimension of the plane-wave normalizable kernel of such a Dirac operator for fermions of any representation of $SU(N)$ in the presence of any spherically symmetric monopole background. Notably, our results also apply to fermions coupled to monopoles that preserve non-abelian gauge symmetry.

30 pages, no figures

References in corpus (1)

• Magnetic Monopole Dynamics, Supersymmetry, and Duality

Cited by in corpus (1)

• Monopole-fermion scattering and varying Fock space