Generalized, Energy-conserving Numerical Simulations of Particles in General Relativity. II. Test Particles in Electromagnetic Fields and GRMHD

Bacchini, F.; Ripperda, B.; Porth, O.; Sironi, L.

doi:10.3847/1538-4365/aafcb3

Title: Generalized, Energy-conserving Numerical Simulations of Particles in General Relativity. II. Test Particles in Electromagnetic Fields and GRMHD

Journal Article · Fri Feb 15 00:00:00 EST 2019 · The Astrophysical Journal. Supplement Series (Online)

DOI:https://doi.org/10.3847/1538-4365/aafcb3· OSTI ID:1612632

^[1];

^[2]; Porth, O. ^[3]; Sironi, L. ^[4]

Katholieke Univ. (KU) Leuven (Belgium)
Katholieke Univ. (KU) Leuven (Belgium); Goethe Univ., Frankfurt (Germany)
Goethe Univ., Frankfurt (Germany); Univ. of Amsterdam (The Netherlands)
Columbia Univ., New York, NY (United States)

Observations of compact objects, in the form of radiation spectra, gravitational waves by LIGO/Virgo, and direct imaging with the Event Horizon Telescope, are currently the main information sources on plasma physics in extreme gravity. Modeling such physical phenomena Requires numerical methods that allow for the simulation of microscopic plasma dynamics in the presence of both strong gravity and electromagnetic fields. In Bacchini et al. (2018), we presented a detailed study of numerical techniques for the integration of free geodesic motion. In this paper, we extend the study by introducing electromagnetic forces in the simulation of charged particles in curved spacetimes. We extend the Hamiltonian energy-conserving method presented in Bacchini et al. to include the Lorentz force, and we test its performance compared to that of standard explicit Runge–Kutta and implicit midpoint rule schemes against analytic solutions. Then, we show the application of the numerical schemes to the integration of test particle trajectories in general relativistic magnetohydrodynamic (GRMHD) simulations by modifying the algorithms to handle grid-based electromagnetic fields. We test this approach by simulating ensembles of charged particles in a static GRMHD configuration obtained with the black hole accretion code (BHAC).

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Research Organization:: Columbia Univ., New York, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC); Belgian Science Policy Office (BELSPO); European Research Council (ERC); National Aeronautics and Space Administration (NASA); National Science Foundation (NSF); Research Foundation Flanders (FWO); Flemish Government

Grant/Contract Number:: SC0016542

OSTI ID:: 1612632

Journal Information:: The Astrophysical Journal. Supplement Series (Online), Vol. 240, Issue 2; ISSN 1538-4365

Publisher:: American Astronomical Society/IOPCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 19 works

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Very-high-energy Emission from Magnetic Reconnection in the Radiative-inefficient Accretion Flow of SgrA* Rodríguez-Ramírez, Juan Carlos; de Gouveia Dal Pino, Elisabete M.; Alves Batista, Rafael The Astrophysical Journal, Vol. 879, Issue 1 https://doi.org/10.3847/1538-4357/ab212e	journal	June 2019
The Event Horizon General Relativistic Magnetohydrodynamic Code Comparison Project Porth, Oliver; Chatterjee, Koushik; Narayan, Ramesh The Astrophysical Journal Supplement Series, Vol. 243, Issue 2 https://doi.org/10.3847/1538-4365/ab29fd	journal	August 2019
The Event Horizon General Relativistic Magnetohydrodynamic Code Comparison Project Porth, Oliver; Chatterjee, Koushik; Narayan, Ramesh Maryland Shared Open Access Repository https://doi.org/10.13016/m2htjg-wbul	collection	January 2019
A Novel Energy-conserving Scheme for Eight-dimensional Hamiltonian Problems Hu, Shiyang; Wu, Xin; Huang, Guoqing The Astrophysical Journal, Vol. 887, Issue 2 https://doi.org/10.3847/1538-4357/ab5061	journal	December 2019
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