Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...2e...9a&link_type=abstract
On the Present and Future of Pulsar Astronomy, 26th meeting of the IAU, Joint Discussion 2, 16-17 August, 2006, Prague, Czech Re
Astronomy and Astrophysics
Astronomy
Scientific paper
Electrostatic plasma modes along the open field lines of a rotating neutron star endowed with gravitomagnetic charge or NUT parameter have been considered. Goldreich-Julian charge density in general relativity is analyzed for the neutron star with nonzero NUT parameter. It is found that the charge density is maximum at the polar cap and remains almost the same in a certain extended region of the pole. For a steady state Goldreich-Julian charge density we found the usual plasma oscillation along the field lines; plasma frequency resembles the gravitational redshift close to the Schwarzschild radius. We study the nonlinear plasma mode along the field lines. The equation contains a term that describes the growing plasma modes near Schwarzschild radius in a black hole environment. The term vanishes with the distance far away from the gravitating object. For initially zero potential and field on the surface of a neutron star, Goldreich-Julian charge density is found to create the plasma mode, which is enhanced and propagates almost without damping along the open field lines of magnetized NUT star.
Ahmedov Bobomurat J.
Kagmanova V. G.
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