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    Transition from gas to plasma kinetic equilibria in gravitating axisymmetric structures

    Zdeněk Stuchlík · Duben 01, 2014 · Fyzika · 0 comments
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    Publication date: Apr 2014

    Abstract:
    The problem of the transition from gas to plasma in gravitating
    axisymmetric structures is addressed under the assumption of having
    initial and final states realized by kinetic Maxwellian-like equilibria.
    In astrophysics, the theory applies to accretion-disc scenarios around
    compact objects. A formulation based on non-relativistic kinetic theory
    for collisionless systems is adopted. Equilibrium solutions for the
    kinetic distribution functions describing the initial neutral matter and
    the resulting plasma state are constructed in terms of single-particle
    invariants and expressed by generalized Maxwellian distributions. The
    final plasma configuration is related to the initial gas distribution by
    the introduction of appropriate functional constraints. Qualitative
    aspects of the solution are investigated and physical properties of the
    system are pointed out. In particular, the admitted functional
    dependences of the fluid fields carried by the corresponding equilibrium
    distributions are determined. Then, the plasma is proved to violate the
    condition of quasi-neutrality, implying a net charge separation between
    ions and electrons. This result is shown to be independent of the
    precise realization of the plasma distribution function, while a
    physical mechanism able to support a non-neutral equilibrium state is
    proposed.

    Authors:
    Cremaschini, Claudio; Stuchlík, Zdeněk;

    https://ui.adsabs.harvard.edu/abs/2014PhPl…21d2902C

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