Arno Vanthieghem
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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: Relativistically magnetized collisionless shocks in pair plasma: Solitons, chaos, and thermalization
Relativistically magnetized collisionless shocks in pair plasma: Solitons, chaos, and thermalization Open
In this paper, the first in a series, we present a new theoretical model for the global structure and dissipation of relativistically magnetized collisionless shock waves. Quite remarkably, we find that in contrast to unmagnetized shocks, …
View article: Fast Radio Bursts as Precursor Radio Emission from Monster Shocks
Fast Radio Bursts as Precursor Radio Emission from Monster Shocks Open
It has been proposed recently that the breaking of magnetohydrodynamics (MHD) waves in the inner magnetosphere of strongly magnetized neutron stars can power different types of high-energy transients. Motivated by these considerations, we …
View article: Relativistically Magnetized Collisionless Shocks in Pair Plasma: I. Solitons, Chaos, and Thermalization
Relativistically Magnetized Collisionless Shocks in Pair Plasma: I. Solitons, Chaos, and Thermalization Open
In this paper, the first in a series, we present a new theoretical model for the global structure and dissipation of relativistically magnetized collisionless shock waves. Quite remarkably, we find that in contrast to unmagnetized shocks, …
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: Microphysics of Particle Reflection in Weibel-mediated Shocks
Microphysics of Particle Reflection in Weibel-mediated Shocks Open
Particle-in-cell (PIC) simulations have shown that relativistic collisionless shocks mediated by the Weibel instability accelerate ∼1% of incoming particles, while the majority are transmitted through the shock and become thermalized. The …
View article: Electron-Ion Temperature Ratio in Transrelativistic Unmagnetized Shock Waves
Electron-Ion Temperature Ratio in Transrelativistic Unmagnetized Shock Waves Open
Weakly magnetized shock waves are paramount to a large diversity of environments, including supernova remnants, blazars, and binary-neutron-star mergers. Understanding the distribution of energy between electrons and ions within these astr…
View article: Electron heating in high Mach number collisionless shocks
Electron heating in high Mach number collisionless shocks Open
The energy partition in high Mach number collisionless shock waves is central to a wide range of high-energy astrophysical environments. We present a new theoretical model for electron heating that accounts for the energy exchange between …
View article: Microphysics of Particle Reflection in Weibel-Mediated Shocks
Microphysics of Particle Reflection in Weibel-Mediated Shocks Open
Particle-in-cell (PIC) simulations have shown that relativistic collisionless shocks mediated by the Weibel instability accelerate about 1% of incoming particles, while the majority are transmitted through the shock and become thermalized.…
View article: Anomalous coupling in radiation mediated shocks
Anomalous coupling in radiation mediated shocks Open
We summarize recent attempts to unravel the role of plasma kinetic effects in radiation mediated shocks. Such shocks form in all strong stellar explosions and are responsible for the early electromagnetic emission released from these event…
View article: Magnetically driven coupling in relativistic radiation-mediated shocks
Magnetically driven coupling in relativistic radiation-mediated shocks Open
The radiation drag in photon-rich environments of cosmic explosions can seed kinetic instabilities by inducing velocity spreads between relativistically streaming plasma components. Such microturbulence is likely imprinted on the breakout …
View article: Origin of Intense Electron Heating in Relativistic Blast Waves
Origin of Intense Electron Heating in Relativistic Blast Waves Open
The modeling of gamma-ray burst afterglow emission bears witness to strong electron heating in the precursor of Weibel-mediated, relativistic collisionless shock waves propagating in unmagnetized electron–ion plasmas. In this Letter, we pr…
View article: Origin of intense electron heating in relativistic blast waves
Origin of intense electron heating in relativistic blast waves Open
The modeling of gamma-ray burst afterglow emission bears witness to strong electron heating in the precursor of Weibel-mediated, relativistic collisionless shock waves propagating in unmagnetized electron-ion plasmas. In this Letter, we pr…
View article: The role of plasma instabilities in relativistic radiation-mediated shocks: stability analysis and particle-in-cell simulations
The role of plasma instabilities in relativistic radiation-mediated shocks: stability analysis and particle-in-cell simulations Open
Relativistic radiation-mediated shocks are likely formed in prodigious cosmic explosions. The structure and emission of such shocks are regulated by copious production of electron–positron pairs inside the shock-transition layer. It has be…
View article: Proton inelastic cross section at ultrahigh energies
Proton inelastic cross section at ultrahigh energies Open
We study the consequences of high-energy collider data on the best fits to total, elastic, and inelastic cross sections for $pp$ and $p\bar{p}$ scattering using two very distinct unitarisation schemes: the eikonal and the $U$-matrix. Despi…
View article: Physics and Phenomenology of Weakly Magnetized, Relativistic Astrophysical Shock Waves
Physics and Phenomenology of Weakly Magnetized, Relativistic Astrophysical Shock Waves Open
Weakly magnetized, relativistic collisionless shock waves are not only the natural offsprings of relativistic jets in high-energy astrophysical sources, they are also associated with some of the most outstanding displays of energy dissipat…
View article: Physics of relativistic collisionless shocks. II. Dynamics of the background plasma
Physics of relativistic collisionless shocks. II. Dynamics of the background plasma Open
In this second paper of a series, we discuss the dynamics of a plasma entering the precursor of an unmagnetized, relativistic collisionless pair shock. We discuss how this background plasma is decelerated and heated through its interaction…
View article: Physics of relativistic collisionless shocks. III. The suprathermal particles
Physics of relativistic collisionless shocks. III. The suprathermal particles Open
In this third paper of a series, we discuss the physics of the population of\naccelerated particles in the precursor of an unmagnetized, relativistic\ncollisionless pair shock. In particular, we provide a theoretical estimate of\ntheir sca…
View article: Physics of relativistic collisionless shocks: The scattering-center frame
Physics of relativistic collisionless shocks: The scattering-center frame Open
In this first paper of a series dedicated to the microphysics of unmagnetized, relativistic collisionless pair shocks, we discuss the physics of the Weibel-type transverse current filamentation instability that develops in the shock precur…
View article: Physics of Weibel-Mediated Relativistic Collisionless Shocks
Physics of Weibel-Mediated Relativistic Collisionless Shocks Open
We develop a comprehensive theoretical model of relativistic collisionless pair shocks mediated by the current filamentation instability. We notably characterize the noninertial frame in which this instability is of a mostly magnetic natur…