Asymmetric Neutrino Reaction in Magnetized Proto-Neutron Stars in Fully Relativistic Approach
1 College of Bioresource Sciences, Nihon University, Fujisawa 252-0880, Japan
2 National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan
3 Department of Astronomy, University of Tokyo, Bunkyo, Tokyo 113-0033, Japan
4 Department of Physics, Soongsil University,, Seoul 156-743, Korea
We calculate asymmetric neutrino absorption and scattering cross sections on hot and dense magnetized neutron-star matter including hyperons in fully relativistic mean-field theory. The absorption/scattering cross sections are suppressed/enhanced incoherently in the direction of the magnetic field B = Bẑ. The asymmetry is 2–4% at the matter density ρ0 ≤ ρB ≤ 3ρ0 and temperature T ≤ 40MeV for B = 2 × 1017G. Then we solve the Boltzmann equation for the neutrino transport in 1D attenuation approximation, and get the result that the kick velocity becomes about 300 km/s for the proto-neutron star with 168 solar mass at T = 20MeV.
© Owned by the authors, published by EDP Sciences, 2012