T. Maruyama, J. Hidaka, T. Kajino, N. Yasutake, T. Kuroda, M. K. Cheoun, C. Y. Ryu, Grant. J. Mathews
We calculate the spin deceleration of proto-neutron stars by asymmetric neutrino absorption in the context of a fully relativistic mean field theory. We calculate for the first time the spin deceleration of neutron stars due to asymmetric neutrino absorption in a toroidal magnetic field configurations. We find a surprising effect that the deceleration can much larger for asymmetric neutrino absorption in a toroidal magnetic field than the usually presumed braking due to magnetic dipole radiation. This may explain the observation that magnetars appear to have had a more rapid deceleration in the past.
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http://arxiv.org/abs/1301.7495
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