Zobrazeno 1 - 10
of 99
pro vyhledávání: '"Dmitri A. Uzdensky"'
Autor:
Gregory R. Werner, Dmitri A. Uzdensky
Publikováno v:
The Astrophysical Journal Letters, Vol 964, Iss 2, p L21 (2024)
Using 3D particle-in-cell simulation, we characterize energy conversion, as a function of guide magnetic field, in a thin current sheet in semirelativistic plasma, with relativistic electrons and subrelativistic protons. There, magnetic reconnection,
Externí odkaz:
https://doaj.org/article/50db001cecc94201a85b752e26773fe1
Publikováno v:
The Astrophysical Journal, Vol 960, Iss 1, p 12 (2023)
We report on a first-principles numerical and theoretical study of plasma dynamo in a fully kinetic framework. By applying an external mechanical force to an initially unmagnetized plasma, we develop a self-consistent treatment of the generation of
Externí odkaz:
https://doaj.org/article/1dfe795c53a54e78b0951a376947afaf
Publikováno v:
The Astrophysical Journal, Vol 948, Iss 1, p 19 (2023)
Magnetic reconnection in the relativistic regime has been proposed as an important process for the efficient production of nonthermal particles and high-energy emission. Using fully kinetic particle-in-cell simulations, we investigate how the guide-f
Externí odkaz:
https://doaj.org/article/99cfa66e965c43dc8ef647208eac8832
Publikováno v:
The Astrophysical Journal, Vol 944, Iss 1, p 24 (2023)
We demonstrate using linear theory and particle-in-cell (PIC) simulations that a synchrotron-cooling collisionless plasma acquires pressure anisotropy and, if the plasma beta is sufficiently high, becomes unstable to the firehose instability, in a pr
Externí odkaz:
https://doaj.org/article/8a5882401026455aa3becb2d44f14809
Publikováno v:
Physical Review Research, Vol 1, Iss 1, p 012004 (2019)
Magnetic energy transfer from small to large scales due to successive magnetic island coalescence is investigated. A solvable analytical model is introduced and shown to correctly capture the evolution of the main quantities of interest, as borne out
Externí odkaz:
https://doaj.org/article/9f388ec22ee44a71a5c1c2124d0445bf
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 508:4532-4572
Relativistic magnetic reconnection is a powerful agent through which magnetic energy can be tapped in astrophysics, energizing particles that then produce observed radiation. In some systems, the highest energy photons come from particles Comptonizin
Publikováno v:
Proceedings of the National Academy of Sciences. 119
Significance Astronomical observations indicate that dynamically important magnetic fields are ubiquitous in the Universe, while their origin remains a profound mystery. This work provides a paradigm for understanding the origin of cosmic magnetism b
Autor:
José Ortuño-Macías, Krzysztof Nalewajko, Dmitri A. Uzdensky, Mitchell C. Begelman, Gregory R. Werner, Alexander Y. Chen, Bhupendra Mishra
Relativistic magnetized jets, such as those from AGN, GRBs and XRBs, are susceptible to current- and pressure-driven MHD instabilities that can lead to particle acceleration and non-thermal radiation. Here we investigate the development of these inst
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e4e50a90d0bbfff5d9cd93f1ce07f011
Fully kinetic shearing-box simulations of magnetorotational turbulence in 2D and 3D. I. Pair plasmas
Autor:
Fabio Bacchini, Lev Arzamasskiy, Vladimir Zhdankin, Gregory R. Werner, Mitchell C. Begelman, Dmitri A. Uzdensky
The magnetorotational instability (MRI) is a fundamental mechanism determining the macroscopic dynamics of astrophysical accretion disks. In collisionless accretion flows around supermassive black holes, MRI-driven plasma turbulence cascading to micr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b5928f0e89b9c5ccd904a31da3d97917
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 498:799-820
Rapid gamma-ray flares pose an astrophysical puzzle, requiring mechanisms both to accelerate energetic particles and to produce fast observed variability. These dual requirements may be satisfied by collisionless relativistic magnetic reconnection. O