Fast Radio Bursts from neutron stars plunging into black holes
  Fast radio bursts (FRBs) are millisecond-duration intense radio flares
occurring at cosmological distances. Many models have been proposed to explain
these topical astronomical events, but none has so far been confirmed. Here we
show that a novel way involving enhanced giant radio pulses from a rapidly
spun-up neutron star near a spinning black hole can explain the main properties
of non-repeating FRBs. Independent observations of such pulses, which are not
enhanced, from some Galactic pulsars make our model reliable. If correct, our
model would imply the existence of event horizons, the Lense-Thirring effect,
and a significant spin energy extraction from a black hole. Moreover, an FRB
would then probe the pulsar magnetosphere and its emission, and map the strong
gravity region near a black hole. Besides, our model predicts simultaneous
detections of FRBs and gravitational waves from black hole -- neutron star
mergers for fortuitously nearby FRB events.
