17 citations · 53 across the 11 of their papers we have counts for
11 papers
Two-Phase Structure of Synchrotron-Cooling-Unstable Relativistic Plasma
Agnieszka Wierzchucka, Pablo J. Bilbao, Robert J. Ewart +2
Using analytic theory, radiative particle-in-cell (PIC) simulations, and fluid simulations, we show that relativistic, synchrotron-cooling, collisionless, high- pair plasmas fil…
Characteristics of monotonic sheaths near a wall with grazing magnetic incidence
Alessandro Geraldini, Robert J. Ewart, Stephan Brunner +1
We consider a magnetised plasma in contact with an absorbing planar wall, where the angle between the magnetic field and the wall is small, (in radians) and the system…
Cosmic-ray transport in inhomogeneous media
Robert J. Ewart, Patrick Reichherzer, Shuzhe Ren +6
A theory of cosmic-ray transport in multi-phase diffusive media is developed, with the specific application to cases in which the cosmic-ray diffusion coefficient has large spatial…
Self-Similar Cosmic-Ray Transport in High-Resolution Magnetohydrodynamic Turbulence
Philipp Kempski, Drummond B. Fielding, Eliot Quataert +5
We study the propagation of cosmic rays (CRs) through a simulation of magnetohydrodynamic (MHD) turbulence at unprecedented resolution of . We drive turbulence that is…
Universal fluctuation spectrum of Vlasov-Poisson turbulence
Michael L. Nastac, Robert J. Ewart, James Juno +2
The thermal fluctuation spectrum of the electric field arising due to particle noise in a quiescent Vlasov-Poisson plasma was derived in the 1960s. Here, we derive the universal fl…
Gravitational Turbulence: the Small-Scale Limit of the Cold-Dark-Matter Power Spectrum
Yonadav Barry Ginat, Michael L. Nastac, Robert J. Ewart +3
The matter power spectrum, , is one of the fundamental quantities in the study of large-scale structure in cosmology. Here, we study its small-scale asymptotic limit, and sho…
Relaxation to universal non-Maxwellian equilibria in a collisionless plasma
Robert J. Ewart, Michael L. Nastac, Pablo J. Bilbao +3
Generic equilibria are derived for turbulent relaxing plasmas via an entropy-maximization procedure that accounts for the short-time conservation of certain collisionless invariant…
Ring momentum distributions as a general feature of Vlasov dynamics in the synchrotron dominated regime
Pablo. J. Bilbao, Robert J. Ewart, Francisco Assunçao +2
We study how radiation reaction leads plasmas initially in kinetic equilibrium to develop features in momentum space, such as anisotropies and population inversion, resulting in a…
Cosmic-ray confinement in radio bubbles by micromirrors
Robert J. Ewart, Patrick Reichherzer, Archie F. A. Bott +2
Radio bubbles, ubiquitous features of the intracluster medium around active galactic nuclei, are known to rise buoyantly for multiple scale heights through the intracluster medium…
Efficient micromirror confinement of sub-TeV cosmic rays in galaxy clusters
Patrick Reichherzer, Archie F. A. Bott, Robert J. Ewart +4
Cosmic rays (CRs) play a pivotal role in shaping the thermal and dynamical properties of astrophysical environments, such as galaxies and galaxy clusters. Recent observations sugge…
Phase-space entropy cascade and irreversibility of stochastic heating in nearly collisionless plasma turbulence
Michael L. Nastac, Robert J. Ewart, Wrick Sengupta +3
We consider a nearly collisionless plasma consisting of a species of `test particles' in 1D-1V, stirred by an externally imposed stochastic electric field. The mean effect on the p…