Spinning gauged boson and Dirac stars: A comparative study

Scalar boson stars and Dirac are solitonic solutions of the Einstein{Klein-Gordon Einstein- classical equations, respectively. Despite different bosonic vs: fermionic nature matter field, these to field equations have been shown qualitatively similar features [1]. In particular, for spinning most fundamental configurations can be in both cases toroidal, unlike Proca that spheroidal [2]. this paper we gauge scalar fields, by minimally coupling them standard electromagnetism. We explore impact on resulting solutions. One relevant difference concerns gyromagnetic ratio, which takes values around 1, whereas 2.