Köln 2025 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 60: Astroparticle Physics VIII

HK 60.2: Vortrag

Donnerstag, 13. März 2025, 18:00–18:15, SR 0.03 Erw. Physik

Generating ultra-compact neutron stars with bosonic dark matter — •Sarah Louisa Pitz and Jürgen Schaffner-Bielich — Max-von-Laue Straße 1, D-60438 Frankfurt am Main

Neutron stars with admixed dark matter enable new possibilities in the description of unusal mass and radius measurements, such as e.g. HESS J1731-347. We are including bosonic, self-interacting dark matter with a sufficiently stiff self-interaction potential in the form of V ∝ φⁿ and find that these neutron stars become ultra-compact (C ≥ 1/3). They are compact enough to have a stable photon orbit at their surface or even above, a property that is otherwise exclusively attributed to black holes or hypothetical boson stars. These ultra-compact neutron stars are characterized by small radii of the ordinary matter (R < 7 km) and masses of approximately 1.5   M_⊙. We furthermore study the stability of these configurations by investigating the onset of unstable radial modes.