Tomoyuki Maruyama, Nobutoshi Yasutake, Myung-Ki Cheoun, Jun Hidaka, Toshitaka Kajino. Grant. J. Mathews, Chung-Yeol Ryu
We make a perturbative calculation of neutrino scattering and absorption in
hot and dense hyperonic neutron-star matter in the presence of a strong
magnetic field. We find that the absorption cross-sections show a remarkable
angular dependence in that the neutrino absorption strength is reduced in a
direction parallel to the magnetic field and enhanced in the opposite
direction. This asymmetry in the neutrino absorbtion can be as much as 2.2 % of
the entire neutrino momentum for an interior magnetic field of \sim 2 x 10^{17}
G. We estimate the pulsar kick velocities associated with this asymmetry in a
fully relativistic mean-field theory formulation. We show that the kick
velocities calculated here are comparable to observed pulsar velocities.
View original:
http://arxiv.org/abs/1201.3455
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