93 citations · 374 across the 18 of their papers we have counts for
18 papers
Thermodynamics and collisionality in firehose-susceptible high- plasmas
A. F. A. Bott, M. W. Kunz, E. Quataert +2
We study the evolution of collisionless plasmas that, due to their macroscopic evolution, are susceptible to the firehose instability, using both analytic theory and hybrid-kinetic…
Collisionless Magnetorotational Turbulence in Pair Plasmas: Steady-state Dynamics, Particle Acceleration, and Radiative Cooling
Fabio Bacchini, Vladimir Zhdankin, Evgeny A. Gorbunov +4
We present 3D fully kinetic shearing-box simulations of pair-plasma magnetorotational turbulence with unprecedented macro-to-microscopic scale separation. While retrieving the expe…
Balanced Turbulence and the Helicity Barrier in Black Hole Accretion
George N. Wong, Lev Arzamasskiy
Horizon-scale observations from the Event Horizon Telescope (EHT) have enabled precision study of supermassive black hole accretion. Contemporary accretion modeling often treats th…
Tearing-mediated reconnection in magnetohydrodynamic poorly ionized plasmas. I. Onset and linear evolution
Elizabeth A. Tolman, Matthew W. Kunz, James M. Stone +1
In high-Lundquist-number plasmas, reconnection proceeds via onset of tearing, followed by a nonlinear phase during which plasmoids continuously form, merge, and are ejected from th…
HelioSwarm: A Multipoint, Multiscale Mission to Characterize Turbulence
Kristopher G. Klein, Harlan Spence, Olga Alexandrova +47
HelioSwarm (HS) is a NASA Medium-Class Explorer mission of the Heliophysics Division designed to explore the dynamic three-dimensional mechanisms controlling the physics of plasma…
Damping of MHD Turbulence in A Partially Ionized Medium
Yue Hu, Siyao Xu, Lev Arzamasskiy +2
The coupling state between ions and neutrals in the interstellar medium plays a key role in the dynamics of magnetohydrodynamic (MHD) turbulence, but is challenging to study numeri…
Pressure anisotropy and viscous heating in weakly collisional plasma turbulence
Jonathan Squire, Matthew W Kunz, Lev Arzamasskiy +3
Pressure anisotropy can strongly influence the dynamics of weakly collisional, high-beta plasmas, but its effects are missed by standard magnetohydrodynamics (MHD). Small changes t…
Galactic bar resonances with diffusion: an analytic model with implications for bar-dark matter halo dynamical friction
Chris Hamilton, Elizabeth A. Tolman, Lev Arzamasskiy +1
The secular evolution of disk galaxies is largely driven by resonances between the orbits of 'particles' (stars or dark matter) and the rotation of non-axisymmetric features (spira…
Kinetic Turbulence in Collisionless High-Beta Plasmas
Lev Arzamasskiy, Matthew W. Kunz, Jonathan Squire +2
We present results from three-dimensional hybrid-kinetic simulations of Alfvénic turbulence in a high-beta, collisionless plasma. The key feature of such turbulence is the interpla…
Fully kinetic shearing-box simulations of magnetorotational turbulence in 2D and 3D. I. Pair plasmas
Fabio Bacchini, Lev Arzamasskiy, Vladimir Zhdankin +3
The magnetorotational instability (MRI) is a fundamental mechanism determining the macroscopic dynamics of astrophysical accretion disks. In collisionless accretion flows around su…
High-frequency heating of the solar wind triggered by low-frequency turbulence
Jonathan Squire, Romain Meyrand, Matthew W. Kunz +3
The fast solar wind's high speeds and nonthermal features require that significant heating occurs well above the Sun's surface. Two leading theories seem incompatible: low-frequenc…
Adaptive critical balance and firehose instability in an expanding, turbulent, collisionless plasma
A. F. A. Bott, L. Arzamasskiy, M. W. Kunz +2
Using hybrid-kinetic particle-in-cell simulation, we study the evolution of an expanding, collisionless, magnetized plasma in which strong Alfvénic turbulence is persistently drive…
On stochastic heating and its phase-space signatures in low- kinetic turbulence
Silvio Sergio Cerri, Lev Arzamasskiy, Matthew W. Kunz
We revisit the theory of stochastic heating of ions and investigate its phase-space signatures in kinetic turbulence of relevance to low- portions of the solar wind. We retain a…
Direct Detection of Black Hole-Driven Turbulence in the Centers of Galaxy Clusters
Yuan Li, Marie-Lou Gendron-Marsolais, Irina Zhuravleva +16
Supermassive black holes (SMBHs) are thought to provide energy that prevents catastrophic cooling in the centers of massive galaxies and galaxy clusters. However, it remains unclea…
Hybrid-Kinetic Simulations of Ion Heating in Alfvénic Turbulence
Lev Arzamasskiy, Matthew W. Kunz, Benjamin D. G. Chandran +1
We present three-dimensional, hybrid-kinetic numerical simulations of driven Alfvén-wave turbulence of relevance to the collisionless near-Earth solar wind. Special attention is pa…
Three-Dimensional Disk-Satellite Interaction: Torques, Migration, and Observational Signatures
Lev Arzamasskiy, Zhaohuan Zhu, James M. Stone
The interaction of a satellite with a gaseous disk results in the excitation of spiral density waves which remove angular momentum from the orbit. In addition, if the orbit is not…
Disk Accretion Driven by Spiral Shocks
Lev Arzamasskiy, Roman R. Rafikov
Spiral density waves are known to exist in many astrophysical disks, potentially affecting disk structure and evolution. We conduct a numerical study of the effects produced by a d…
Evolution of non-spherical pulsars with plasma-filled magnetospheres
Lev Arzamasskiy, Alexander Philippov, Alexander Tchekhovskoy
Pulsars are famous for their rotational stability. Most of them steadily spin down and display a highly repetitive pulse shape. But some pulsars experience timing irregularities su…