Speaker
Description
The effect of dark scalar- and vector-mediated interactions on the stellar structure of dark matter admixed neutron stars are investigated employing the two-fluid formalism of the TOV equations. Three different nuclear equations of state (BSk22, MPA1 and APR4) are used to describe the baryonic sector, while the dark component consists of fermionic particles treated within a relativistic mean field framework. Both linear and quadratic scalar interactions with the dark fermion are considered, including a quartic self-interaction in the latter case. The parameters of the dark matter models are inferred via a Bayesian analysis that incorporates data from NICER observations and binary neutron star merger detections. The resulting neutron star configurations develop dark matter cores, leading to more compact objects with smaller masses and radii. Scalar interactions are generally found to have a weaker impact on the stellar structure than vector-mediated ones, though quantitative differences arise.
