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- 저자 : Ivan Siutsou (검색결과 2 건)
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General Relativistic White Dwarfs and Their Astrophysical Implications
Kuantay Boshkayev,Jorge A. Rueda,Remo Ruffini,Ivan Siutsou 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.6
We consider applications of general relativistic uniformly-rotating white dwarfs to several astrophysicalphenomena related to the spin-up and the spin-down epochs and to delayed type Ia supernovaexplosions 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 SoftGamma Repeaters and Anomalous X-Ray Pulsars as massive rapidly-rotating highly-magnetizedwhite dwarfs. Particularly we consider one of the so-called low-magnetic-field magnetars SGR0418+5729 as a massive rapidly-rotating highly-magnetized white dwarf and give bounds for themass, radius, moment of inertia, and magnetic field by requiring the general relativistic uniformlyrotatingconfigurations to be stable.
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On the Distribution of Dark Matter in Galaxies: Quantum Treatments
Carlos R. Arg¨uelles,Remo Ruffini,Ivan Siutsou,Bernardo Fraga 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.6
The problem of modeling the distribution of dark matter in galaxies in terms of equilibriumconfigurations of collisionless self-gravitating quantum particles is considered. We first summarizethe pioneering model of a Newtonian self-gravitating Fermi gas in thermodynamic equilibriumdeveloped by Ruffini and Stella (1983), which is shown to be a generalization of the King modelfor fermions. We further review the extension of the former model developed by Gao, Merafinaand Ruffini (1990), done for any degree of fermion degeneracy at the center (0), within generalrelativity. Finally, we present here for the first time the solutions of the density profiles and rotationcurves corresponding to the model of Gao et al. Those solutions have a definite mass Mh and acircular velocity vh at the halo radius rh of the configurations, which are typical of spiral galaxies. This treatment allows us to determine a novel core-halo morphology for the dark-matter profiles,as well as a novel bound on the particle mass associated with those profiles.
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