General Relativistic White Dwarfs and Their Astrophysical Implications

Abstract

We consider applications of general relativistic uniformly-rotating white dwarfs to several astrophysical phenomena related to the spin-up and the spin-down epochs and to delayed type Ia supernova explosions of super-Chandrasekhar white dwarfs, where we estimate the "spinning down" lifetime due to magnetic-dipole braking. In addition, we describe the physical properties of Soft Gamma Repeaters and Anomalous X-Ray Pulsars as massive rapidly-rotating highly-magnetized white dwarfs. Particularly we consider one of the so-called low-magnetic-field magnetars SGR 0418+5729 as a massive rapidly-rotating highly-magnetized white dwarf and give bounds for the mass, radius, moment of inertia, and magnetic field by requiring the general relativistic uniformly-rotating configurations to be stable.

arXiv comment13 pages, 4 figures. arXiv admin note: text overlap with arXiv:1204.2070

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• Oxygen-neon rich merger during common envelope evolution
• AR Scorpii and possible gravitational wave radiation from pulsar white dwarfs
• Nonvalidity of I-Love-Q Relations for Hot White Dwarf Stars
• Rotating white dwarf models with finite-temperature envelope
• Time evolution of rotating and magnetized white dwarf stars
• Equilibrium Configurations of Rotating White Dwarfs at Finite Temperatures
• Effects of magnetic fields in white dwarfs
• Ultra-high energy cosmic rays from white dwarf pulsars and the Hillas criterion
• Observational Properties of SNe Ia Progenitors Close to the Explosion