Asymmetric neutrino propagation in newly born magnetized strange stars; GRB and kicks

AbstractWe consider the early cooling evolution of strongly magnetized strange stars in a color–flavor-lockedphase with high gap 100 MeV. We demonstrate how this model may explain the main features ofthe gamma-ray burst phenomena and also yield a strong star kick. The mechanism is based on beaming ofneutrino emission along the magnetic vortex lines. We show that for sufficiently high initial temperaturesT 0 ∼ 30–60 MeV and surface magnetic fields B s ∼ 10 15 –10 17 G, the energy release within the narrowbeam is up to 10 52 erg with a magnetic field dependent timescale between 10 −2 s (for a smaller magneticfie ld)and 10 s. The above mechanism together with the parity violation of the neutrino-producing weakinteraction processes in a magnetic field allow for the strange star kick. The higher the magnetic field thelarger the star kick velocity. These velocities may cover the same range as observed pulsar kick velocities. c 2006 Elsevier B.V. All rights reserved. Keywords: Gamma-ray bursts; Strange stars; Color superconductivity; Pulsar kicks