Daniel Grošelj
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View article: Driven Collisionless Reconnection of Force-free Flux Tubes: From Onset to Coalescence
Driven Collisionless Reconnection of Force-free Flux Tubes: From Onset to Coalescence Open
We investigate the onset of driven collisionless reconnection and plasmoid formation in a magnetically dominated pair plasma, using 2D particle-in-cell simulations. Two force-free flux tubes of radius R are initially pushed together with a…
View article: Leaking Outside the Box: Kinetic Turbulence with Cosmic-Ray Escape
Leaking Outside the Box: Kinetic Turbulence with Cosmic-Ray Escape Open
We study particle acceleration in strongly turbulent pair plasmas using novel 3D particle-in-cell simulations, featuring particle injection from an external heat bath and diffusive escape. We demonstrate the formation of steady-state, nont…
View article: Generation of Large-scale Magnetic Fields Upstream of Gamma-Ray Burst Afterglow Shocks
Generation of Large-scale Magnetic Fields Upstream of Gamma-Ray Burst Afterglow Shocks Open
The origins of the magnetic fields that power gamma-ray burst (GRB) afterglow emission are not fully understood. One possible channel for generating these fields involves the pre-conditioning of the circumburst medium: in the early aftergl…
View article: Driven Collisionless Reconnection of Force-free Flux Tubes: From Onset to Coalescence
Driven Collisionless Reconnection of Force-free Flux Tubes: From Onset to Coalescence Open
We investigate the onset of driven collisionless reconnection and plasmoid formation in a magnetically dominated pair plasma, using 2D Particle-in-Cell simulations. Two force-free flux tubes of radius $R$ are initially pushed together with…
View article: Generation of Large-scale Magnetic Fields Upstream of Gamma-Ray Burst Afterglow Shocks
Generation of Large-scale Magnetic Fields Upstream of Gamma-Ray Burst Afterglow Shocks Open
The origins of the magnetic fields that power gamma-ray burst (GRB) afterglow emission are not fully understood. One possible channel for generating these fields involves the pre-conditioning of the circumburst medium: in the early aftergl…
View article: Long-term Evolution of Relativistic Unmagnetized Collisionless Shocks
Long-term Evolution of Relativistic Unmagnetized Collisionless Shocks Open
We study a relativistic collisionless electron–positron shock propagating into an unmagnetized ambient medium using 2D particle-in-cell simulations of unprecedented duration and size. The shock generates intermittent magnetic structures of…
View article: Radiative Particle-in-Cell Simulations of Turbulent Comptonization in Magnetized Black-Hole Coronae
Radiative Particle-in-Cell Simulations of Turbulent Comptonization in Magnetized Black-Hole Coronae Open
We report results from the first radiative particle-in-cell simulations of strong Alfvénic turbulence in plasmas of moderate optical depth. The simulations are performed in a local 3D periodic box and self-consistently follow the evolution…
View article: Long-term Evolution of Relativistic Unmagnetized Collisionless Shocks
Long-term Evolution of Relativistic Unmagnetized Collisionless Shocks Open
We study a relativistic collisionless electron-positron shock propagating into an unmagnetized ambient medium using 2D particle-in-cell simulations of unprecedented duration and size. The shock generates intermittent magnetic structures of…
View article: Radiative Particle-in-Cell Simulations of Turbulent Comptonization in Magnetized Black-Hole Coronae
Radiative Particle-in-Cell Simulations of Turbulent Comptonization in Magnetized Black-Hole Coronae Open
We report results from the first radiative particle-in-cell simulations of strong Alfvenic turbulence in plasmas of moderate optical depth. The simulations are performed in a local 3D periodic box and self-consistently follow the evolution…
View article: Microphysics of Relativistic Collisionless Electron-ion-positron Shocks
Microphysics of Relativistic Collisionless Electron-ion-positron Shocks Open
We perform particle-in-cell simulations to elucidate the microphysics of relativistic weakly magnetized shocks loaded with electron-positron pairs. Various external magnetizations σ ≲ 10 −4 and pair-loading factors Z ± ≲ 10 are studied, wh…
View article: Kinetic Plasma Turbulence: Recent Insights and Open Questions From 3D3V Simulations
Kinetic Plasma Turbulence: Recent Insights and Open Questions From 3D3V Simulations Open
Turbulence and kinetic processes in magnetized space plasmas have been\nextensively investigated over the past decades via \\emph{in-situ} spacecraft\nmeasurements, theoretical models and numerical simulations. In particular,\nmulti-point …
View article: Kinetic Turbulence in Astrophysical Plasmas: Waves and/or Structures?
Kinetic Turbulence in Astrophysical Plasmas: Waves and/or Structures? Open
The question of the relative importance of coherent structures and waves has\nfor a long time attracted a great deal of interest in astrophysical plasma\nturbulence research, with a more recent focus on kinetic scale dynamics. Here\nwe uti…
View article: Interplay between intermittency and dissipation in collisionless plasma turbulence
Interplay between intermittency and dissipation in collisionless plasma turbulence Open
We study the damping of collisionless Alfvénic turbulence in a strongly magnetised plasma by two mechanisms: stochastic heating (whose efficiency depends on the local turbulence amplitude $\unicode[STIX]{x1D6FF}z_{\unicode[STIX]{x1D706}}$ …
View article: Numerical Study of Inertial Kinetic-Alfvén Turbulence
Numerical Study of Inertial Kinetic-Alfvén Turbulence Open
Recent observational and analytical studies suggested that a new regime of kinetic turbulence may exist in plasma environments with low electron beta (Chen & Boldyrev 2017). Such a regime, termed inertial kinetic-Alfvén turbulence (iKAW), …
View article: Inertial Kinetic-Alfvén Turbulence
Inertial Kinetic-Alfvén Turbulence Open
Recent observational and analytical studies suggested that a new regime of kinetic turbulence may exist in plasma environments with low electron beta (Chen and Boldyrev, 2017). Such a regime, termed inertial kinetic-Alfvén turbulence, is r…
View article: Interplay between intermittency and dissipation in collisionless plasma turbulence
Interplay between intermittency and dissipation in collisionless plasma turbulence Open
We study the damping of collisionless Alfvénic turbulence by two mechanisms: stochastic heating (whose efficiency depends on the local turbulence amplitude $δz_λ$) and linear Landau damping (whose efficiency is independent of $δz_λ$), desc…
View article: Fully Kinetic Simulation of 3D Kinetic Alfvén Turbulence
Fully Kinetic Simulation of 3D Kinetic Alfvén Turbulence Open
We present results from a three-dimensional particle-in-cell simulation of plasma turbulence, resembling the plasma conditions found at kinetic scales of the solar wind. The spectral properties of the turbulence in the subion range are con…
View article: Fully Kinetic Simulation of 3D Kinetic Alfven Turbulence
Fully Kinetic Simulation of 3D Kinetic Alfven Turbulence Open
We present results from a three-dimensional particle-in-cell simulation of plasma turbulence, resembling the plasma conditions found at kinetic scales of the solar wind. The spectral properties of the turbulence in the subion range are con…
View article: Fully Kinetic versus Reduced-kinetic Modeling of Collisionless Plasma Turbulence
Fully Kinetic versus Reduced-kinetic Modeling of Collisionless Plasma Turbulence Open
We report the results of a direct comparison between different kinetic models of collisionless plasma turbulence in two spatial dimensions. The models considered include a first-principles fully kinetic (FK) description, two widely used re…
View article: Structure of Plasma Heating in Gyrokinetic Alfvénic Turbulence
Structure of Plasma Heating in Gyrokinetic Alfvénic Turbulence Open
We analyze plasma heating in weakly collisional kinetic Alfvén wave turbulence using high resolution gyrokinetic simulations spanning the range of scales between the ion and the electron gyroradii. Real space structures that have a higher …
View article: How turbulence regulates biodiversity in systems with cyclic competition
How turbulence regulates biodiversity in systems with cyclic competition Open
Cyclic, nonhierarchical interactions among biological species represent a general mechanism by which ecosystems are able to maintain high levels of biodiversity. However, species coexistence is often possible only in spatially extended sys…