Tidal Force and Torque on the Crust of Neutron Stare
No Thumbnail Available
Date
2010-06
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Addis Ababa University
Abstract
The long term evolution of the relative rotation of the core super fluid in a neutron
stare with respect to the rest of the star is determined through Legase modal.The core
superfluid rotates at a different rate ,while spinning down at the same steady-state rate as
the rest of the star, because of the assumed pinning between the superfluid vortices and
the superconductor fluxoids.We find that the magnitude of this rotational lag changes with
time and also depends on the distance from the rotation axis; the core superfluid supports
an evolving pattern of differential rotation. We argue that the predicted change of the lag
might occur as discrete events which could result in a sudden rise of the spin frequency of
the crust of a neutron star, as is observed at glitches in radio pulsars. This new possibility
for the triggering cause of glitches in radio pulsars is further supported by an estimate
of the total predicted excess angular momentum reservoir of the core superfluid. The
model seems also to offer resolutions for some other aspects of the observational data on
glitches. The goal of this project is to show the tidal effect on the differential motion of
the crust with respect to the core of the neutron star from that we find the redistribution
of angular velocity and tidal locking time for the crust core interaction of neutron stare
Description
Keywords
Tidal Force and Torque