Influence of dark matter on hybrid and twin stars

Abstract

We investigate the impact of dark matter (DM) on hybrid and twin stars within a two-fluid framework, where DM and normal matter interact only through gravity. A self-interacting fermionic DM model is considered, while for the nuclear and quark matter we employ relativistic mean-field models and the constant sound-speed parameterization, respectively. Solving the two-fluid Tolman-Oppenheimer-Volkoff equations over a five-dimensional parameter space spanning the quark matter transition pressure $p_t$, energy density jump $\Delta \epsilon$, sound speed $C_s^2$, DM particle mass $m_{\chi }$, and DM fraction $f_{\chi }$, we classify the resulting configurations into hybrid stars and four twin star categories and map the onset properties of the quark phase. The effect of DM on the hybrid and twin star population is regime dependent: the DM particle mass determines whether DM forms an extended halo or a compact core, while the DM fraction sets the magnitude of the effect. In the halo regime, DM enhances quark matter formation and increases the number of hybrid and twin stars; in the core regime, it suppresses them. DM also stabilizes hybrid and twin configurations that are unstable in the pure-baryonic case and systematically pushes the nucleon-to-quark transition to higher densities, with the onset pressure, mass, and radius all rising with the DM fraction, potentially hiding quark matter from current neutron star observations.

12 pages, 6 figures, 1 tables. Published in Physical Review D

References in corpus (37)

• Refined Mass and Geometric Measurements of the High-Mass PSR J0740+6620
• PSR J0952-0607: The Fastest and Heaviest Known Galactic Neutron Star
• WIMP Annihilation and Cooling of Neutron Stars
• An updated mass-radius analysis of the 2017-2018 NICER data set of PSR J0030+0451
• Compact stars made of fermionic dark matter
• The Radius of the High-mass Pulsar PSR J0740+6620 with 3.6 yr of NICER Data
• Bosonic Dark Matter in Neutron Stars and its Effect on Gravitational Wave Signal
• Velocity-dependent Self-interacting Dark Matter from Groups and Clusters of Galaxies
• Effects of dark matter on the nuclear and neutron star matter
• Dark matter admixed neutron star as a possible compact component in the GW190814 merger event
• Nucleon Structure and Strong Interactions in Dark Matter Capture in Neutron Stars
• Constraining bosonic asymmetric dark matter with neutron star mass-radius measurements
• Phase transitions in dense matter and the maximum mass of neutron stars
• Tidal Deformability of Dark Matter Admixed Neutron Stars
• Impacts of dark matter on the $f$-mode oscillation of hyperon star
• Impacts of dark matter on the curvature of the neutron star
• Constraining self-interacting fermionic dark matter in admixed neutron stars using multimessenger astronomy
• Effects of dark matter on the in-spiral properties of the binary neutron stars
• Investigating Dark Matter-Admixed Neutron Stars with NITR Equation of State in Light of PSR J0952-0607
• Dark Matter Effects on the Compact Star Properties
• Dark matter effects on hybrid star properties
• Dark matter effects on the properties of neutron stars: compactness and tidal deformability
• Rapid neutron star cooling triggered by dark matter
• Searching for New Physics in Ultradense Environment: a Review on Dark Matter Admixed Neutron Stars
• Pasta properties of the neutron star within effective relativistic mean-field model
• Masquerading hybrid stars with dark matter
• Probing fermionic asymmetric dark matter cores using global neutron star properties
• Rapidly spinning dark matter-admixed neutron stars
• Thermodynamic Consistent Description of Compact Stars of Two Interacting Fluids: The Case of Neutron Stars with Higgs Portal Dark Matter
• $f$-mode oscillations of dark matter admixed quarkyonic neutron star
• Universal relation involving fundamental modes in two-fluid dark matter admixed neutron stars
• Cooling of dark neutron stars
• Illuminating dark matter admixed in neutron stars with simultaneous mass-radius constraints
• Observational Probes of the Neutron Star Equation of State with Hyperons, Bosonic Dark Matter, and Quark Matter
• Dark I-Love-Q
• Probing Strange Dark Matter through $f$-mode Oscillations of Neutron Stars with Hyperons and Quark Matter
• Fermionic versus Bosonic Dark Matter in Neutron Stars: A Bayesian Study with Multi-Density Constraints