258 citations · 867 across the 21 of their papers we have counts for
12 papers · 1 filter
Comparison of magnetic diffusion and reconnection in ideal and resistive relativistic magnetohydrodynamics, ideal magnetodynamics, and resistive force-free electrodynamics
Michael P. Grehan, Tanisha Ghosal, James R. Beattie +3
High-energy astrophysical systems and compact objects are frequently modeled using ideal relativistic magnetohydrodynamic (MHD) or force-free electrodynamic (FFE) simulations, with…
A New Particle Pusher with Hadronic Interactions for Modeling Multimessenger Emission from Compact Objects
Minghao Zou, Hayk Hakobyan, Rostom Mbarek +3
We propose novel numerical schemes based on the Boris method in curved spacetime, incorporating both hadronic and radiative interactions for the first time. Once the proton has los…
Particle-in-cell Simulations of the Magnetorotational Instability in Stratified Shearing Boxes
Astor Sandoval, Mario Riquelme, Anatoly Spitkovsky +1
The magnetorotational instability (MRI) plays a crucial role in regulating the accretion efficiency in astrophysical accretion disks. In low-luminosity disks around black holes, su…
RelSIM: A Relativistic Semi-implicit Method for Particle-in-Cell Simulations
Fabio Bacchini
We present a novel Relativistic Semi-Implicit Method (RelSIM) for particle-in-cell (PIC) simulations of astrophysical plasmas, implemented in a code framework ready for production…
Collisionless accretion onto black holes: dynamics and flares
Alisa Galishnikova, Alexander Philippov, Eliot Quataert +3
We study the accretion of collisionless plasma onto a rotating black hole from first principles using axisymmetric general-relativistic particle-in-cell simulations. We carry out a…
Effective resistivity in relativistic collisionless plasmoid-mediated reconnection
Sebastiaan Selvi, Oliver Porth, Bart Ripperda +3
Magnetic reconnection can power spectacular high-energy astrophysical phenomena by producing non-thermal energy distributions in highly magnetized regions around compact objects. B…
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…
A coupled guiding center-Boris particle pusher for magnetized plasmas in compact-object magnetospheres
Fabio Bacchini, Bart Ripperda, Alexander A. Philippov +1
We present a novel numerical scheme for simulating the motion of relativistic charged particles in magnetospheres of compact objects, typically filled with highly magnetized collis…
Magnetic Reconnection and Hot Spot Formation in Black Hole Accretion Disks
Bart Ripperda, Fabio Bacchini, Alexander Philippov
Hot spots, or plasmoids, forming due to magnetic reconnection in current sheets, are conjectured to power frequent X-ray and near-infrared flares from Sgr A*, the black hole in the…
Numerical methods for General Relativistic particles
Fabio Bacchini, Bart Ripperda, Lorenzo Sironi
We present recent developments on numerical algorithms for computing photon and particle trajectories in the surrounding of compact objects. Strong gravity around neutron stars or…
Generalized, energy-conserving numerical simulations of particles in general relativity. II. Test particles in electromagnetic fields and GRMHD
Fabio Bacchini, Bart Ripperda, Oliver Porth +1
Direct observations of compact objects, in the form of radiation spectra, gravitational waves from VIRGO/LIGO, and forthcoming direct imaging, are currently one of the primary sour…
Generalized, energy-conserving numerical simulations of particles in general relativity. I. Time-like and null geodesics
Fabio Bacchini, Bart Ripperda, Alexander Yuran Chen +1
The numerical integration of particle trajectories in curved spacetimes is fundamental for obtaining realistic models of the particle dynamics around massive compact objects such a…