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Magnetically inspired explosive outflows from neutron-star mergers
Antonios Nathanail, Oliver Porth, Luciano Rezzolla
Binary neutron-star mergers have long been associated with short-duration gamma-ray bursts (GRBs). This connection was confirmed with the first coincident detection of gravitationa…
Relativistic resistive magnetohydrodynamic reconnection and plasmoid formation in merging flux tubes
Bart Ripperda, Oliver Porth, Lorenzo Sironi +1
We apply the general relativistic resistive magnetohydrodynamics code {\tt BHAC} to perform a 2D study of the formation and evolution of a reconnection layer in between two merging…
Test particles in relativistic resistive magnetohydrodynamics
Bart Ripperda, Oliver Porth, Rony Keppens
The Black Hole Accretion Code (BHAC) has recently been extended with the ability to evolve charged test particles according to the Lorentz force within resistive relativistic magne…
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…
How to tell an accreting boson star from a black hole
Hector Olivares, Ziri Younsi, Christian M. Fromm +6
The capability of the Event Horizon Telescope (EHT) to image the nearest supermassive black hole candidates at horizon-scale resolutions offers a novel means to study gravity in it…
Particle acceleration in relativistic magnetic flux-merging events
Maxim Lyutikov, Serguei Komissarov, Lorenzo Sironi +1
Using analytical and numerical methods (fluid and particle-in-cell simulations) we study a number of model problems involving merger of magnetic flux tubes in relativistic magnetic…
Particle acceleration in explosive relativistic reconnection events and Crab Nebula gamma-ray flares
Maxim Lyutikov, Serguei Komissarov, Lorenzo Sironi +1
We develop a model of gamma-ray flares of the Crab Nebula resulting from the magnetic reconnection events in highly-magnetized relativistic plasma. We first discuss physical parame…
Explosive X-point collapse in relativistic magnetically-dominated plasma
Maxim Lyutikov, Serguei Komissarov, Lorenzo Sironi +1
The extreme properties of the gamma ray flares in the Crab Nebula present a clear challenge to our ideas on the nature of particle acceleration in relativistic astrophysical plasma…
The Current Ability to Test Theories of Gravity with Black Hole Shadows
Yosuke Mizuno, Ziri Younsi, Christian M. Fromm +6
Our Galactic Center, Sagittarius A* (Sgr A*), is believed to harbour a supermassive black hole (BH), as suggested by observations tracking individual orbiting stars. Upcoming sub-m…
The Black Hole Accretion Code: adaptive mesh refinement and constrained transport
Hector Olivares, Oliver Porth, Yosuke Mizuno
With the forthcoming VLBI images of Sgr A* and M87, simulations of accretion flows onto black holes acquire a special importance to aid with the interpretation of the observations…