Can magnetic fields of astrophysical objects be fundamental ?

TL;DR

This paper introduces new static solutions in Einstein-Maxwell-Dilaton gravity with scalar fields, suggesting that magnetic fields of some astrophysical objects might be fundamental rather than emergent phenomena.

Contribution

It presents a novel class of exact solutions with scalar, mass, and dipole charges, and explores their implications for the nature of magnetic fields in astrophysics.

Findings

Scalar interactions are weak in solar fields but detectable in pulsar environments

Scalar force can be attractive or repulsive

Magnetic fields could be fundamental rather than induced

Abstract

We analyze a new class of static exact solutions of Einstein-Maxwell-Dilaton gravity with arbitrary scalar coupling constant $\alpha$, representing a gravitational body endowed with electromagnetic dipole moment. This class possesses mass, dipole and scalar charge parameters. A discussion of the geodesic motion shows that the scalar field interaction is so weak that it cannot be measured in gravitational fields like the sun, but it could perhaps be detected in gravitational fields like pulsars. The scalar force can be attractive or repulsive. This gives rise to the hypothesis that the magnetic field of some astrophysical objects could be fundamental.