Millicharged particles weaken pulsational pair-instability in massive stars, shifting the lower edge of the black hole mass gap upward and turning gravitational wave observations into a probe for particles with masses 35-200 keV and charges 10^{-10} to 10^{-9}.
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Semi-analytical fits are derived for millicharged particle energy-loss rates in three regimes relevant to pre-supernova stellar cores.
Updated supernova ALP production rates including semi-Compton and pair-annihilation channels yield revised bounds on electron couplings, dominated by the decay a to e+ e- gamma at small couplings.
Planetary thunderstorms yield constraints on millicharged particles with the strongest bound q > 10^{-24} for bosonic mCPs from Saturn's layered clouds.
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.
citing papers explorer
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The Black Hole Mass Gap as a New Probe of Millicharged Particles
Millicharged particles weaken pulsational pair-instability in massive stars, shifting the lower edge of the black hole mass gap upward and turning gravitational wave observations into a probe for particles with masses 35-200 keV and charges 10^{-10} to 10^{-9}.
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Millicharged Particle Production During Late-Stage Stellar Evolution
Semi-analytical fits are derived for millicharged particle energy-loss rates in three regimes relevant to pre-supernova stellar cores.
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Supernova production of axion-like particles coupling to electrons, reloaded
Updated supernova ALP production rates including semi-Compton and pair-annihilation channels yield revised bounds on electron couplings, dominated by the decay a to e+ e- gamma at small couplings.
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Constraints on millicharged particles from thunderstorms on the Solar system planets
Planetary thunderstorms yield constraints on millicharged particles with the strongest bound q > 10^{-24} for bosonic mCPs from Saturn's layered clouds.
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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.