Can fermion-boson stars reconcile multi-messenger observations of compact stars?

Abstract

Mixed fermion-boson stars are stable, horizonless, everywhere regular solutions of the coupled Einstein-(complex, massive) Klein-Gordon-Euler system. While isolated neutron stars and boson stars are uniquely determined by their central energy density, mixed configurations conform an extended parameter space that depends on the combination of the number of fermions and (ultra-light) bosons. The wider possibilities offered by fermion-boson stars could help explain the tension in the measurements of neutron star masses and radii reported in recent multi-messenger observations and nuclear-physics experiments. In this work we construct equilibrium configurations of mixed fermion-boson stars with realistic equations of state for the fermionic component and different percentages of bosonic matter. We show that our solutions are in excellent agreement with multi-messenger data, including gravitational-wave events GW170817 and GW190814 and X-ray pulsars PSR J0030+0451 and PSR J0740+6620, as well as with nuclear physics constraints from the PREX-2 experiment.

9 pages, 7 figures

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• Dynamical friction of black holes in ultralight dark matter
• Constraining bosonic asymmetric dark matter with neutron star mass-radius measurements
• Dark matter admixed neutron star properties in the light of X-ray pulse profile observations
• Bosonic Dark Matter in Light of the NICER Precise Mass-Radius Measurements
• The effects of self-interacting bosonic dark matter on neutron star properties
• Tidal Deformability of Fermion-Boson Stars: Neutron Stars Admixed with Ultra-Light Dark Matter
• Dynamical evolution of dark matter admixed neutron stars
• Quasi-equilibrium configurations of binary systems of dark matter admixed neutron stars
• Rotating dark matter admixed neutron stars
• Fermion Proca Stars: Vector Dark Matter Admixed Neutron Stars
• Dynamical evolution of fermion-boson stars with realistic equations of state
• Thermodynamic Consistent Description of Compact Stars of Two Interacting Fluids: The Case of Neutron Stars with Higgs Portal Dark Matter
• Can dark-matter Q-balls grow to the mass gap masses?
• Impact of ultralight bosonic dark matter on the dynamical bar-mode instability of rotating neutron stars
• Ultralight bosonic dark matter in white dwarfs and potential observational consequences
• I-Love-Q Relations of Fermion-Boson Stars