Marcelo Marzola Compact Star Twins with a Dark Matter Core David Alvarez-Castillo, Michał Marczenko We present a model of compact stars with a dark matter core. The hadronic equation of state is based on the parity doublet model and does not present a phase transition to quark matter. Instead, a strong first-order phase transition to dark matter described by a constant speed of sound model leads to the scenario of compact star mass twins. Compact star structural properties which obey state-of-the-art measurements and constraints are presented. Comments: 9 pages, 2 figures, Proceedings of the XXVII Cracow EPIPHANY Conference on Recent Advances in Astroparticle Physics (2022) Subjects: High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th) Cite as: arXiv:2209.06602 [astro-ph.HE] (or arXiv:2209.06602v1 [astro-ph.HE] for this version) https://doi.org/10.48550/arXiv.2209.06602 Focus to learn more Journal reference: Acta Phys. Pol. B Proc. Suppl. 15, 3-A28 (2022) Related DOI: https://doi.org/10.5506/APhysPolBSupp.15.3-A28 Focus to learn more