Spinar Paradigm and Gamma Ray Bursts Central Engine
Abstract
A spinar is a quasiequilibrium collapsing object whose equilibrium is maintained by the balance of centrifugal and gravitational forces and whose evolution is determined by its magnetic field. The spinar quasi equilibrium model recently discussed as the course for extralong Xray plateu in GRB (Lipunov & Gorbovskoy, 2007). We propose a simple non stationary threeparameter collapse model with the determining role of rotation and magnetic field in this paper. The input parameters of the theory are the mass, angular momentum, and magnetic field of the collapsar. The model includes approximate description of the following effects: centrifugal force, relativistic effects of the Kerr metrics, pressure of nuclear matter, dissipation of angular momentum due to magnetic field, decrease of the dipole magnetic moment due to compression and generalrelativity effects (the black hole has no hare), neutrino cooling, time dilatation, and gravitational redshift. The model describes the temporal behavior of the central engine and demonstrates the qualitative variety of the types of such behavior in nature. We apply our approach to explain the observed features of gammaray bursts of all types. In particular, the model allows the phenomena of precursors, xray and optical bursts, and the appearance of a plateau on time scales of several thousand seconds to be unified.
 Publication:

arXiv eprints
 Pub Date:
 June 2007
 DOI:
 10.48550/arXiv.0706.3191
 arXiv:
 arXiv:0706.3191
 Bibcode:
 2007arXiv0706.3191L
 Keywords:

 Astrophysics
 EPrint:
 17 pages, 16figures, MNRAS in print