163 citations · 1.2k across the 44 of their papers we have counts for
12 papers · 1 filter
OSIRIS-GR: General relativistic activation of the polar cap of a compact neutron star
R. Torres, T. Grismayer, F. Cruz +2
We present ab initio global general-relativistic Particle-in-cell (GR-PIC) simulations of compact millisecond neutron star magnetospheres in the axisymmetric aligned rotator config…
Particle-in-cell simulations of pulsar magnetospheres: transition between electrosphere and force-free regimes
Fábio Cruz, Thomas Grismayer, Alexander Y. Chen +3
Global particle-in-cell (PIC) simulations of pulsar magnetospheres are performed with a volume, surface and pair production-based plasma injection schemes to systematically investi…
High-energy synchrotron flares powered by strongly radiative relativistic magnetic reconnection: 2D and 3D PIC simulations
K. M. Schoeffler, T. Grismayer, D. Uzdensky +1
The time evolution of high-energy synchrotron radiation generated in a relativistic pair plasma energized by reconnection of strong magnetic fields is investigated with two- and th…
Magnetic frame-dragging correction to the electromagnetic solution of a compact neutron star
R. Torres, T. Grismayer, F. Cruz +1
Neutron stars are usually modelled as spherical, rotating perfect conductors with a predominant intrinsic dipolar magnetic field anchored to their stellar crust. Due to their compa…
Model of pulsar pair cascades in non uniform electric fields: growth rate, density profile and screening time
Fábio Cruz, Thomas Grismayer, Simon Iteanu +2
Time-dependent cascades of electron-positron pairs are thought to be the main source of plasma in pulsar magnetospheres and a primary ingredient to explain the nature of pulsar rad…
Coherent emission from QED cascades in pulsar polar caps
Fábio Cruz, Thomas Grismayer, Alexander Y. Chen +2
Pulsar magnetospheres are thought to be filled with electron-positron plasma generated in pair cascades. The driving mechanism of these cascades is the emission of gamma-ray photon…
Kinetic model of large-amplitude oscillations in neutron star pair cascades
Fábio Cruz, Thomas Grismayer, Luis O. Silva
Electron-positron pair cascades developed in the extreme electromagnetic fields of neutron star polar caps are considered a key source of magnetospheric plasma in these objects. We…
Extreme Plasma Astrophysics
D. Uzdensky, M. Begelman, A. Beloborodov +22
This is a science white paper submitted to the Astro-2020 and Plasma-2020 Decadal Surveys. The paper describes the present status and emerging opportunities in Extreme Plasma Astro…
Bright gamma-ray flares powered by magnetic reconnection in QED-strength magnetic fields
K. M. Schoeffler, T. Grismayer, D. Uzdensky +2
Strong magnetic fields in magnetospheres of neutron stars (especially magnetars) and other astrophysical objects may release their energy in violent, intense episodes of magnetic r…
Fully kinetic large scale simulations of the collisionless Magnetorotational instability
Giannandrea Inchingolo, Thomas Grismayer, Nuno F. Loureiro +2
We present two-dimensional particle-in-cell (PIC) simulations of the fully kinetic collisionless magnetorotational instability (MRI) in weakly magnetized (high ) pair plasma. Th…
Electron-scale shear instabilities: magnetic field generation and particle acceleration in astrophysical jets
E. P. Alves, T. Grismayer, R. A. Fonseca +1
Strong shear flow regions found in astrophysical jets are shown to be important dissipation regions, where the shear flow kinetic energy is converted into electric and magnetic fie…
Large-scale magnetic field generation via the kinetic Kelvin-Helmholtz instability in unmagnetized scenarios
E. P. Alves, T. Grismayer, S. F. Martins +3
Collisionless plasma instabilities are fundamental in magnetic field generation in astrophysical scenarios, but their role has been addressed in scenarios where velocity shear is a…