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Efficiency of Neutrino Annihilation around Spinning Black Holes
Ivan Zalamea, Andrei M. Beloborodov
A fraction of neutrino emission from GRB accretion disks annihilates above the disk, creating e+- plasma that can drive GRB explosions. We calculate the efficiency of this annihila…
Untwisting magnetospheres of neutron stars
Andrei M. Beloborodov
Magnetospheres of neutron stars are anchored in the rigid crust and can be twisted by sudden crustal motions ("starquakes"). The twisted magnetosphere does not remain static and gr…
Hyper-accreting black holes
Andrei M. Beloborodov
Hyper-accretion disks are short-lived, powerful sources of neutrinos and magnetized jets. Such disks are plausible sources of gamma-ray bursts. This review describes the disk struc…
Polar-cap accelerator and radio emission from pulsars
Andrei M. Beloborodov
Electric currents j flow along the open magnetic field lines from the polar caps of neutron stars. Activity of a polar cap depends on the ratio α=j/cρ_GJ, where ρ_GJ is the corotat…
On the Mechanism of Gamma-Ray Burst Afterglows
Z. Lucas Uhm, Andrei M. Beloborodov
The standard model of afterglow production by the forward shock wave is not supported by recent observations. We propose a model in which the forward shock is invisible and aftergl…
Magnetar Corona
A. M. Beloborodov, C. Thompson
Persistent high-energy emission of magnetars is produced by a plasma corona around the neutron star, with total energy output of ~10^{36}erg/s. The corona forms as a result of occa…