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pro vyhledávání: '"Vishniac, Ethan"'
We study the properties of sub-Alfvenic magnetohydrodynamic (MHD) turbulence, i.e., turbulence with Alfven Mach number $M_A=V_L/V_A<1$, where $V_L$ is the velocity at the injection scale and $V_A$ is the Alfven velocity. We demonstrate that weak turb
Externí odkaz:
http://arxiv.org/abs/2312.05399
Autor:
Zenati, Yossef, Vishniac, Ethan T.
Magnetic helicity is robustly conserved in systems with very large magnetic Reynolds numbers, including most systems of astrophysical interest, and unlike kinetic and magnetic energy is not dissipated at small scales. This plays a major role in suppr
Externí odkaz:
http://arxiv.org/abs/2106.06078
Local magnetic reversals are an inseparable part of magnetohydrodynamic (MHD) turbulence whose collective outcome on an arbitrary scale in the inertial range may lead to a global stochastic reconnection event with a rate independent of small scale ph
Externí odkaz:
http://arxiv.org/abs/2004.06186
The level of spatial complexity associated with a given vector field on an arbitrary range of scales \iffalse ${\bf F(x}, t)$ can be quantified by a simple, time-dependent function $S(t)={1\over 2}(1-\hat{\bf F}_l.\hat{\bf F}_L)_{rms}$ with ${\bf F}_
Externí odkaz:
http://arxiv.org/abs/2003.12722
Autor:
Lazarian, Alex, Eyink, Gregory L., Jafari, Amir, Kowal, Grzegorz, Li, Hui, Xu, Siyao, Vishniac, Ethan T.
Magnetic reconnection, topological change in magnetic fields, is a fundamental process in magnetized plasmas. It is associated with energy release in regions of magnetic field annihilation, but this is only one facet of this process. Astrophysical fl
Externí odkaz:
http://arxiv.org/abs/2001.00868
Autor:
Li, Yuan, Gendron-Marsolais, Marie-Lou, Zhuravleva, Irina, Xu, Siyao, Simionescu, Aurora, Tremblay, Grant R., Lochhaas, Cassandra, Bryan, Greg L., Quataert, Eliot, Murray, Norman W., Boselli, Alessandro, Hlavacek-Larrondo, Julie, Zheng, Yong, Fossati, Matteo, Li, Miao, Emsellem, Eric, Sarzi, Marc, Arzamasskiy, Lev, Vishniac, Ethan T.
Supermassive black holes (SMBHs) are thought to provide energy that prevents catastrophic cooling in the centers of massive galaxies and galaxy clusters. However, it remains unclear how this "feedback" process operates. We use high-resolution optical
Externí odkaz:
http://arxiv.org/abs/1911.06329
Over the last few years it became clear that turbulent magnetic reconnection and magnetized turbulence are inseparable. It was not only shown that reconnection is responsible for violating the frozen-in condition in turbulence, but also that stochast
Externí odkaz:
http://arxiv.org/abs/1909.09179
Autor:
Jafari, Amir, Vishniac, Ethan
We study the evolution of turbulent magnetic fields from a topological point of view, invoking commonplace mathematical tools from general topology and dynamical systems theory which connect magnetic field evolution to time reversal invariance, entro
Externí odkaz:
http://arxiv.org/abs/1909.07325
Autor:
Jafari, Amir, Vishniac, Ethan
We study the topology associated with physical vector and scalar fields. A mathematical object, e.g., a ball, can be continuously deformed, without tearing or gluing, to make other topologically equivalent objects, e.g., a cube or a solid disk. If te
Externí odkaz:
http://arxiv.org/abs/1909.04836
Publikováno v:
Phys. Rev. E 101, 022122 (2020)
Previous work has introduced scale-split energy density \psi for a given vector field B in order to quantify the field stochasticity S(t). Application to turbulent magnetic fields leads to the prediction that tangling magnetic field by turbulence inc
Externí odkaz:
http://arxiv.org/abs/1909.04624