WE Heraeus Physics School und 62. Karpacz Winter School in Theoretical Physics "Multimessenger Astrophysics and Cosmology"

Generating ultra-compact hybrid stars with bosonic dark matter

2 Mar 2026, 12:15

15m

Karpacz, Poland

Speaker

Sarah Louisa Pitz (Goethe University Frankfurt am Main)

Description

We investigate the impact of a stiff dark matter equation of state (EoS) on the structure and stability of neutron stars. For dark matter, we use bosonic, self-interacting scalar fields that generate ultra-compact boson stars with compactness exceeding 1/3. Varying the dark matter particle mass and stiffness shifts stellar configurations across distinct regions of the mass–radius diagram, including regimes inaccessible to normal hadronic matter. We further examine the impact of a phase transition to quark matter and identify features that distinguish these hybrid configurations from stars without a quark core. In both scenarios, stability is assessed within a two-fluid framework by analyzing the onset of unstable radial modes.