Beyond general relativity models, magnetosphere structure and dark matter stars

Abstract

The magnetosphere structure of compact objects is considered in the context of a theory of gravity with dynamical torsion field beyond standard General Relativity (GR). To this end, a new spherically symmetric solution is obtained in this theoretical framework, physically representing a compact object of pseudoscalar fields (for example, axion field). The axially symmetric version of the Grad-Shafranov equation (GSE) is also derived in this context, and used to describe the magnetosphere dynamics of the obtained "axion star". The interplay between high-energy processes and the seed magnetic field with respect to the global structure of the magnetosphere is briefly discussed.