Jet Luminosity From Neutrino-Dominated Accretion Flows in Gamma-Ray Bursts

Understand

A hyperaccretion disk formed around a stellar mass black hole is a plausible model for the central engine that powers gamma-ray bursts (GRBs).

• If the central black hole rotates and a poloidal magnetic field threads its horizon, a powerful relativistic jet may be driven by a process resembling the Blandford-Znajek mechanism.
• We estimate the luminosity of such a jet assuming that the poloidal magnetic field strength is comparable to the inner accretion disk pressure.
• We show that the jet efficiency attains its maximal value when the accretion flow is cooled via optically-thin neutrino emission.