3 research outputs found
Tidal Deformability of Fermion-Boson Stars: Neutron Stars Admixed with Ultra-Light Dark Matter
In this work we investigate the tidal deformability of a neutron star admixed
with dark matter, modeled as a massive, self-interacting, complex scalar field.
We derive the equations to compute the tidal deformability of the full
Einstein-Hilbert-Klein-Gordon system self-consistently, and probe the influence
of the scalar field mass and self-interaction strength on the total mass and
tidal properties of the combined system. We find that dark matter core-like
configurations lead to more compact objects with smaller tidal deformability,
and dark matter cloud-like configurations lead to larger tidal deformability.
Electromagnetic observations of certain cloud-like configurations would appear
to violate the Buchdahl limit. The self-interaction strength is found to have a
significant effect on both mass and tidal deformability. We discuss
observational constraints and the connection to anomalous detections. We also
investigate how this model compares to those with an effective bosonic equation
of state and find the interaction strength where they converge sufficiently.Comment: 14 pages, 7 figures; Accepted for publicatio