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    Charged perfect fluid tori in strong central gravitational and dipolar magnetic fields

    Zdeněk Stuchlík · Červen 01, 2016 · Fyzika · 0 comments
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    Publication date: Jun 2016

    Abstract:
    We study electrically charged perfect fluid toroidal structures
    encircling a spherically symmetric gravitating object with Schwarzschild
    spacetime geometry and endowed with a dipole magnetic field. The work
    represents a direct continuation of our previous general-relativistic
    studies of electrically charged fluid in the approximation of zero
    conductivity, which formed tori around a Reissner-Nordström black hole
    or a Schwarzschild black hole equipped with a test electric charge and
    immersed in an asymptotically uniform magnetic field. After a general
    introduction of the zero-conductivity charged fluid model, we discuss a
    variety of possible topologies of the toroidal fluid configurations.
    Along with the charged equatorial tori forming interesting coupled
    configurations, we demonstrate the existence of the off-equatorial tori,
    for which the dipole type of magnetic field seems to be necessary. We
    focus on orbiting structures with constant specific angular momentum and
    on those in permanent rigid rotation. We stress that the general
    analytical treatment developed in our previous works is enriched here by
    the integrated form of the pressure equations. To put our work into an
    astrophysical context, we identify the central object with an
    idealization of a nonrotating magnetic neutron star. Constraining ranges
    of its parameters and also parameters of the circling fluid, we discuss
    a possible relevance of the studied toroidal structures, presenting
    along with their topology also pressure, density, temperature and charge
    profiles.

    Authors:
    Kovář, Jiří; Slaný, Petr; Cremaschini, Claudio; Stuchlík, Zdeněk; Karas, Vladimír; Trova, Audrey;

    https://ui.adsabs.harvard.edu/abs/2016PhRvD..93l4055K

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