On the possible enhancement of the magnetic field by neutrino reemission processes in the mantle of a supernova

Abstract

URCA neutrino reemission processes under the conditions in the mantle of a supernova with a strong toroidal magnetic field are investigated. It is shown that parity violation in these processes can be manifested macroscopically as a torque that rapidly spins up the region of the mantle occupied by such a field. Neutrino spin-up of the mantle can strongly affect the mechanism of further generation of the toroidal field, specifically, it can enhance the field in a small neighborhood of the rigid-body-rotating core of the supernova remnant.

Inverse beta decay of arbitrarily polarized neutrons in a magnetic field

“…A similar asymmetry has been noted for URCA processes [5], where the neutrino is in the final state. The anisotropy for the S = 0 case comes only from the n ′ = 0 contribution [3]. However, for n ′ = 0, there is a cancellation between the two possible states in a Landau level which washes out all angular dependence in these levels, provided the neutrons are unpolarized.…”

“…Considerable work has been done on the magnetic field dependence of the URCA processes which have neutrinos in their final states [1,2,3,4,5]. An angular dependence obtained in the differential cross section of these reactions imply that in a star with high magnetic field, neutrinos are created asymmetrically with respect to the magnetic field direction.…”

“…Roulet [6], as well as Lai and Qian [7] performed the calculation by assuming that the magnetic field effects enter only through the phase space integrals, whereas the matrix element remains unaffected. Gvozdev and Ognev [3] considered the final electron to be exclusively in the lowest Landau level. Arras and Lai [4] calculated only the angular asymmetry, and only to the first order in the background magnetic field.…”

Нейтринные Процессы Во Внешнем Магнитном Поле В Формализме Матрицы Плотности

“…Различные аспекты идеи о связи асимметрии вылета нейтрино с аномально большими скоростями пульсаров, высказанной в работе [3], интенсивно развивались в последующих исследованиях [4]- [9]. В работах [10], [11] исследовался механизм генерации тороидального поля в процессах нейтринного переизлучения оболочки при магниторотационном взрыве сверхновой. Показано, что этот механизм эффективен и может привести к одностороннему взрыву сверхновой.…”

Neutrino processes in strong magnetic fields and implications for supernova dynamics

“…(1) and (2) have been studied in Ref. [21] assuming that e − and e + only occupy the ground Landau levels. The forward processes in Eqs.…”