3 papers
gr-qc2026
Circular orbits and particle collisions in the space-time of boson stars and their frozen states
Maria Chivers, Betti Hartmann, Katherine Horton +1
In this paper, we discuss the dynamics of test particles in the space-time of spherically symmetric, charged boson stars and their frozen states. These latter objects consist of a…
gr-qc2026
Circular orbits and particle collisions close to charged black holes surrounded by scalar clouds
Maria Chivers, Betti Hartmann, Katherine Horton +1
We study the motion of massive (un)charged test particles in space-times of electric and dyonic black holes which carry scalar hair. We determine the stable and unstable circular o…
gr-qc2025
Hairy charged black holes in a model with bounded scalar field potential
Yves Brihaye, Betti Hartmann, Katherine Horton
Electrically and magnetically charged (a.k.a. dyonic) black holes with scalar hair have recently been constructed for a sextic scalar field potential. Here, we re-investigate this…