Aharonov-Bohm-Casher Problem with a nonminimal Lorentz-violating coupling

TL;DR

This paper investigates how a Lorentz-violating background affects the Aharonov-Bohm-Casher problem, revealing energy level lifting, phase shifts, and modifications due to topological defects, with implications for bounds on Lorentz violation.

Contribution

It introduces a nonminimal Lorentz-violating coupling into the Aharonov-Bohm-Casher problem and analyzes its effects on energy levels and phases, including in topologically nontrivial spaces.

Findings

LV background lifts degeneracy even without magnetic field

Aharonov-Casher phase constrains LV magnitude

Topological defects modify particle eigenenergies

Abstract

The Aharonov-Bohm-Casher problem is examined for a charged particle describing a circular path in presence of a Lorentz-violating background nonminimally coupled to a spinor and a gauge field. It were evaluated the particle eigenenergies, showing that the LV background is able to lift the original degenerescence in the absence of magnetic field and even for a neutral particle. The Aharonov-Casher phase is used to impose an upper bound on the background magnitude. A similar analysis is accomplished in a space endowed with a topological defect, revealing that both the disclination parameter and the LV background are able to modify the particle eigenenergies. We also analyze the particular case where the particle interacts harmonically with the topological defect and the LV background, with similar results.