2025/11/21 by Teruya, G., Lugones, G., Grunfeld, A. G.
#FOS: Physical sciences #High Energy Astrophysical Phenomena (astro-ph.HE) #High Energy Physics - Phenomenology (hep-ph) #Nuclear Theory (nucl-th) #Solar and Stellar Astrophysics (astro-ph.SR)
paper · doi:10.48550/arxiv.2511.16874
We investigate self-bound quark stars in a flavor-dependent quark-mass density-dependent (QMDD) model with an excluded-volume correction. We chart the parameter space at zero pressure to identify self-bound regimes, including cases with a first-order ud → uds transition, and construct cold, β-equilibrated stellar sequences via the Tolman-Oppenheimer-Volkoff equations. The excluded-volume parameter κ controls the stiffness of the equation of state and thus masses, radii, tidal deformabilities, and moments of inertia. Intermediate repulsion typically reconciles Mmax \gtrsim 2 M_\odot with current radius/tidal constraints, with hybrid self-bound objects more compatible than pure strange-quark stars. We identify three EOS-insensitive trends - dimensionless moment of inertia vs. compactness, tidal deformability vs. compactness, and gravitational vs. baryonic compactness - whose explicit κ-dependence largely disappears in dimensionless form (the first two being notably tighter than the third). These results provide model-guided priors and tools for discriminating between hadronic and self-bound EOS families with multimessenger data.