Neutrino emission from spin waves in neutron spin-triplet superfluid

The linear response of a neutron spin-triplet superfluid onto external weak axial-vector field is studied for the case of $^{3}P_{2}$ pairing with a projection of the total angular momentum $m_{j}=0$. The problem is considered in the BCS approximation discarding Fermi-liquid effects. The anomalous axial-vector vertices of neutron quasiparticles possess singularities at some frequencies which specify existence of undamped spin-density waves in the Cooper condensate. The spin waves are of a low excitation energy and are kinematically able to decay into neutrino pairs through neutral weak currents. We evaluate the neutrino emissivity from the spin wave decays in the bulk neutron superfluid in old neutron stars. This calculation predicts significant energy losses from within a neutron star at lowest temperatures when all other mechanisms of neutrino emission are killed by the neutron and proton superfluidity.Comment: 14 pages, 4 figure

Zum Thema: Herdenschutzhunde

Inhalt: Der Wolf und Haustiere Geschichte Rassen Arbeitsweise Entwicklungsstadien des Herdenschutzhundes Anmerkungen zum praktischen Einsatz von HSH „vor Ort“ Entwicklungsstadien des HSH vom Welpen zum erwachsenen Tier (Übersicht

New eigen-mode of spin oscillations in the triplet superfluid condensate in neutron stars

The eigen mode of spin oscillations with $\omega\simeq \sqrt{58/35}\Delta$ is predicted to exist besides already known spin waves with $\omega \simeq\Delta /\sqrt{5}$ in the triplet superfluid neutron condensate in the inner core of neutron stars. The new mode is kinematically able to decay into neutrino pairs through neutral weak currents. The problem is considered in BCS approximation for the case of $^{3}P_{2}-^{3}F_{2}$ pairing with a projection of the total angular momentum $m_{j}=0$ which is conventionally considered as preferable one at supernuclear densities.Comment: 12 pages, 2 figure

Magnetic relaxation of 3He-B after a large tipping pulse

A time dependent precession frequency is observed in 3He-B after a large tipping pulse (>104°) in transverse NMR. Relating the frequency to the tipping angle reveals the time dependence of the longitudinal magnetization. A fit of Fomin's theory to the data yields the Leggett-Takagi collision time at various temperatures