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Neutron stars exclude light dark baryons
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abstract
Exotic new particles carrying baryon number and with mass of order the nucleon mass have been proposed for various reasons including baryogenesis, dark matter, mirror worlds, and the neutron lifetime puzzle. We show that the existence of neutron stars with mass greater than 0.7 $M_\odot$ places severe constraints on such particles, requiring them to be heavier than 1.2 GeV or to have strongly repulsive self-interactions.
Forward citations
Cited by 4 Pith papers
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Minimal Proton-Mass Dark Matter
A minimal dark matter model with one complex scalar carrying B and L numbers, stabilized by proton stability, with mass near the proton mass and relic density from UV freeze-in.
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Echoes of Nucleon Decay from Long-Lived Particles
Introduces echo signatures from vector long-lived particles in nucleon decay, showing high geometric acceptance up to 80% in Super-K, Hyper-K and JUNO for a range of decay lengths.
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Long-Lived Dark Hadrons at the Electron-Ion Collider
A benchmark dark-QCD model with long-lived dark pions mixing into an axion-like state could let the EIC probe electron-portal couplings and dark pion masses beyond the reach of B-factories.
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Bulk viscosity from neutron decays to dark baryons in neutron star matter
Neutron dark decays modify the equation of state and either mildly suppress or strongly enhance bulk viscosity in neutron star merger conditions, depending on the in-medium decay rate.
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