Merid, Asfaw (2013) Tidal Force and Torque on the Crust of Neutron Star. Masters thesis, Addis Ababa University.
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Abstract
A neutron star core superfluid rotates at a different rate to that of the crust, 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 inner crust. 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 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 in glitches in radio pulsars. Glitches are believed to have been caused by break aways of pinned vortices.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 to offer resolutions for some other aspects of the observational data on glitches. The goal of this project is to show the tidal force effect on the differential motion of the crust with respect to the core of the neutron star could lead to the reduction of glitch frequencies and eventually produced gravitational locking between the core and the crust of a neutron star.
| Item Type: | Thesis (Masters) |
|---|---|
| Subjects: | Q Science > Q Science (General) Q Science > QC Physics |
| Divisions: | Africana |
| Depositing User: | Selom Ghislain |
| Date Deposited: | 24 Aug 2018 12:39 |
| Last Modified: | 24 Aug 2018 12:39 |
| URI: | http://thesisbank.jhia.ac.ke/id/eprint/4872 |
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