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  1. link.aps.org

    Mar 13, 2023Figure 1. Comparison of fluid and kinetic simulations of accretion onto a rotating BH. The color shows , which corresponds to the plasma number density in GRMHD simulations (left) and ion and positron number density in GRPIC simulations (right) in a region close to the BH ().The region inside the BH event horizon, , is shown by a black circle.Thin black lines represent the magnetic field lines ...
  2. link.aps.org

    these systems is collisionless, which makes the simplify-ing assumptions of GRMHD formally inapplicable. The-oretical models thus require a kinetic approach, which describes collisionless plasmas from rst-principles. In this Letter we present global GR kinetic simulations of BH accretion and determine the ways in which they di er from conventional
  3. iopscience.iop.org

    Key words: accretion, accretion disks - instabilities - magnetic reconnection - plasmas - turbulence 1. Introduction Accretion disks are astrophysical structures in which a gas or a plasma rotates around a massive central object, such as a black hole or a neutron star, under the effect of the gravitational force (Pringle 1981).
  4. collaborate.princeton.edu

    We study the accretion of collisionless plasma onto a rotating black hole from first principles using axisymmetric general-relativistic particle-in-cell simulations. ... including pressure anisotropy that excites kinetic-scale instabilities, and a large field-aligned heat flux near the horizon that approaches the free-streaming value ...
  5. iopscience.iop.org

    Unfortunately, the typical range of scales and frequencies of the collisionless MRI is such that global kinetic simulations of accretion disks are impossible with present-day computational resources. However, the simulation of a local portion of the disk (the local shearing-box approximation) is just about feasible, and might be sufficient to ...
  6. orfeo.belnet.be

    these systems is collisionless, which makes the simpli-fying assumptions of GRMHD approach formally inappli-cable. Theoretical models thus require a kinetic approach, which describes collisionless plasmas from first principles. In this Letter, we present global GR kinetic simulations of BH accretion and determine the ways in which they differ
  7. theory.pppl.gov

    Our work provides an ab initio kinetic foundation for recent efforts to include kinetic effects into the equations of general relativistic magnetohydrodynamics for studies of black-hole accretion [2,3], as well as for the pioneering fluid simulations of magnetorotational turbulence in a collisionless plasma by Sharma et al. [4].
  8. iopscience.iop.org

    scale-free property, when large-scale dynamics are considered. Since the fully kinetic approach must resolve particle scales such as Debye lengths and gyro radii, it is quite unrealistic to analyze disk-scale behavior, which, in general, occurs on a scale much larger than the kinetic one. In this sense, this work
  9. based model possessing the scale-free property, when large-scale dynamics are considered. Since the fully kinetic approach must resolve particle scales such as Debye lengths and gyro radii, it is quite unrealistic to analyze disk-scale behavior, which, in general, occurs on a scale much larger than the kinetic one.

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