Collisionless Magnetorotational Turbulence in Pair Plasmas: Steady-State Dynamics, Particle Acceleration, and Radiative Cooling.

Autor: Bacchini F; Centre for Mathematical Plasma Astrophysics, Department of Mathematics, KU Leuven, Celestijnenlaan 200B, B-3001 Leuven, Belgium.; Royal Belgian Institute for Space Aeronomy, Solar-Terrestrial Centre of Excellence, Ringlaan 3, 1180 Uccle, Belgium., Zhdankin V; Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.; Center for Computational Astrophysics, Flatiron Institute, 162 Fifth Avenue, New York, New York 10010, USA., Gorbunov EA; Centre for Mathematical Plasma Astrophysics, Department of Mathematics, KU Leuven, Celestijnenlaan 200B, B-3001 Leuven, Belgium., Werner GR; Center for Integrated Plasma Studies, Department of Physics, University of Colorado, 390 UCB, Boulder, Colorado 80309-0390, USA., Arzamasskiy L; School of Natural Sciences, Institute for Advanced Study, Princeton, New Jersey 08544, USA., Begelman MC; JILA, University of Colorado and National Institute of Standards and Technology, 440 UCB, Boulder, Colorado 80309-0440, USA.; Department of Astrophysical and Planetary Sciences, University of Colorado, 391 UCB, Boulder, Colorado 80309-0391, USA., Uzdensky DA; Center for Integrated Plasma Studies, Department of Physics, University of Colorado, 390 UCB, Boulder, Colorado 80309-0390, USA.
Jazyk: angličtina
Zdroj: Physical review letters [Phys Rev Lett] 2024 Jul 26; Vol. 133 (4), pp. 045202.
DOI: 10.1103/PhysRevLett.133.045202
Abstrakt: We present 3D fully kinetic shearing-box simulations of pair-plasma magnetorotational turbulence with unprecedented macro-to-microscopic scale separation. While retrieving the expected fluid behavior of the plasma at large scales, we observe a steepening of turbulent spectra at kinetic scales and substantial angular-momentum transport linked with kinetic processes. For the first time, we provide a definitive demonstration of nonthermal particle acceleration in kinetic magnetorotational turbulence agnostically of shearing-box initial conditions by means of a novel strategy exploiting synchrotron cooling.
Databáze: MEDLINE