Regularization of the Nambu-Jona Lasinio model under a uniform magnetic field and the role of the anomalous magnetic moments

TL;DR

This paper investigates the regularization of the Nambu-Jona Lasinio model under uniform magnetic fields, incorporating anomalous magnetic moments, and analyzes their effects on quark matter properties relevant to neutron stars.

Contribution

It introduces a new regularization scheme combining analytic regularization and subtraction, and explores the impact of anomalous magnetic moments on quark matter in strong magnetic fields.

Findings

Regularization scheme effectively handles divergencies at various magnetic intensities.

Anomalous magnetic moments significantly influence quark matter properties.

Results applicable to neutron star matter at zero temperature.

Abstract

The vacuum contribution to quark matter under a uniform magnetic field within the SU(3) version of the Nambu and Jona-Lasinio model is studied. The standard regularization procedure is examined and a new prescription is proposed. For this purpose analytic regularization and a subtraction scheme are used to deal with divergencies depending on the magnetic intensity. This scheme is combined with the standard three momentum cutoff recipe, and reduces to it for vanishing magnetic intensity. Furthermore, the effects of a direct coupling between the anomalous magnetic moments of the quarks and the magnetic field is considered. Single particle properties as well as bulk thermodynamical quantities are studied for a configuration of matter found in neutron stars. A wide range of baryonic densities and magnetic intensities are examined at zero temperature.