v{- under letter v}-Pair and Axion Productions in Strong Magnetic Field in Relativistic Quantum Approach and Cooling of Magnetars

摘要

We study the v{- under letter v}-pair and axion production from electron and proton, which occurs only under the strong magnetic field. We perform the exact relativistic quantum calculation including the Landau levels and the anomalous magnetic moment. Cooling by v{- under letter v}-pair and axion emission are shown to be much larger than neutrino cooling by the Urca processes. Thus, these processes by the strong magnetic field is expected to contribute very largely to the cooling process of the magnetar.