Journal
PHYSICAL REVIEW D
Volume 105, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.105.063005
Keywords
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Funding
- Spanish Agencia Estatal de Investigacion [PGC2018-095984-B-I00]
- Generalitat Valenciana [PROMETEO/2019/071, GRISOLIAP/2019/029]
- European Union's Horizon 2020 RISE program (H2020-MSCA-RISE-2017) [FunFiCO-777740]
- Fundacao para a Ciencia e a Tecnologia (FCT) [PTDC/FIS-OUT/28407/2017, CERN/FIS-PAR/0027/2019, PTDC/FIS-AST/3041/2020, UIDB/00099/2020]
- Spanish Ramon y Cajal program [RYC-2015-19074]
- Spanish Ministerio de Universidades within the European Union-Next Generation EU [UP2021-044]
- COST Action GWverse [CA16104]
- Italian Instituto Nazionale di Fisica Nucleare (INFN)
- French Centre National de la Recherche Scientifique (CNRS)
- Netherlands Organization for Scientific Research
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This study constructs equilibrium configurations of mixed fermion-boson stars with realistic equations of state for the fermionic component and different percentages of bosonic matter, and demonstrates that these solutions are in good agreement with observational data and nuclear physics constraints.
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 to an extended parameter space that depends on the combination of the number of fermions and (ultralight) bosons. The wider possibilities offered by fermion-boson stars could help to explain the tension in the measurements of neutron star masses and radii reported in recent multimessenger 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 multimessenger 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.
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