2005/10/03 by N. Andersson, T. Sidery, G. L. Comer · 2 citations
Engineering · Physics and Astronomy · #Electron #Fluid dynamics and aerodynamics studies #Geophysics and Sensor Technology #Magnetic field #Momentum transfer #Neutron #Neutron scattering #Neutron star #Pulsars and Gravitational Waves Research #Superfluidity #Turbulence #Vortex #astro-ph
paper · pdf · doi:10.1111/j.1365-2966.2006.10147.x
published as Mon.Not.Roy.Astron.Soc.368:162-170,2006 · MNRAS style, 10 pages
arxiv created 2005/10/03 · openalex publication_date 2006/03/30 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We discuss vortex-mediated mutual friction in the two-fluid model for superfluid neutron star cores. Our discussion is based on the general formalism developed by Carter and collaborators, which makes due distinction between transport velocity and momentum for each fluid. This is essential for an implementation of the so-called entrainment effect, whereby the flow of one fluid imparts momentum in the other and vice versa. The mutual friction follows by balancing the Magnus effect that acts on the quantized neutron vortices with resistivity due to the scattering of electrons off of the magnetic field with which each vortex core is endowed. We derive the form of the macroscopic mutual friction force which is relevant for a model based on smooth-averaging over a collection of vortices. We discuss the coefficients that enter the expression for this force, and the time-scale on which the two interpenetrating fluids in a neutron star core are coupled. This discussion confirms that our new formulation accords well with previous work in this area.