Zobrazeno 1 - 10
of 247
pro vyhledávání: '"Lemoine, Martin"'
Autor:
Lemoine, Martin
When a particle crosses a region of space where the curvature radius of the magnetic field line shrinks below its gyroradius $r_{\rm g}$, it experiences a non-adiabatic (magnetic moment violating) change in pitch angle. The present paper carries that
Externí odkaz:
http://arxiv.org/abs/2304.03023
The efficiency of particle acceleration at shock waves in relativistic, magnetized astrophysical outflows is a debated topic with far-reaching implications. Here, for the first time, we study the impact of turbulence in the pre-shock plasma. Our simu
Externí odkaz:
http://arxiv.org/abs/2303.11394
Autor:
Malkov, Mikhail, Lemoine, Martin
Publikováno v:
Physical Review E 107, 025201 (2023)
A shock wave propagating perpendicularly to an ambient magnetic field accelerates particles considerably faster than in the parallel propagation regime. However, the perpendicular acceleration stops after the shock overruns a circular particle orbit.
Externí odkaz:
http://arxiv.org/abs/2212.08788
Autor:
Lemoine, Martin
This work provides a concrete implementation of E. Fermi's model of particle acceleration in magnetohydrodynamic (MHD) turbulence, connecting the rate of energization to the gradients of the velocity of magnetic field lines, which it characterizes wi
Externí odkaz:
http://arxiv.org/abs/2210.01038
Autor:
Bresci, Virginia, Lemoine, Martin, Gremillet, Laurent, Comisso, Luca, Sironi, Lorenzo, Demidem, Camilia
Collisionless, magnetized turbulence offers a promising framework for the generation of non-thermal high-energy particles in various astrophysical sites. Yet, the detailed mechanism that governs particle acceleration has remained subject to debate. B
Externí odkaz:
http://arxiv.org/abs/2206.08380
The modeling of gamma-ray burst afterglow emission bears witness to strong electron heating in the precursor of Weibel-mediated, relativistic collisionless shock waves propagating in unmagnetized electron-ion plasmas. In this Letter, we propose a the
Externí odkaz:
http://arxiv.org/abs/2204.00546
The current filamentation instability, which generically arises in the counterstreaming of supersonic plasma flows, is known for its ability to convert the free energy associated with anisotropic momentum distributions into kinetic-scale magnetic fie
Externí odkaz:
http://arxiv.org/abs/2111.04651
Autor:
Zech, Andreas, Lemoine, Martin
The multi-wavelength emission from a newly identified population of `extreme-TeV' blazars, with Compton peak frequencies around 1 TeV, is difficult to interpret with standard one-zone emission models. Large values of the minimum electron Lorentz fact
Externí odkaz:
http://arxiv.org/abs/2108.12271
Autor:
Lemoine, Martin
Publikováno v:
Phys. Rev. D 104, 063020 (2021)
Nonthermal acceleration of particles in magnetohydrodynamic (MHD) turbulence plays a central role in a wide variety of astrophysical sites. This physics is addressed here in the context of a strong turbulence, composed of coherent structures rather t
Externí odkaz:
http://arxiv.org/abs/2104.08199
Autor:
Lemoine, Martin, Malkov, Mikhail A.
Numerical simulations of particle acceleration in magnetized turbulence have recently observed powerlaw spectra where pile-up distributions are rather expected. We interpret this as evidence for particle segregation based on acceleration rate, which
Externí odkaz:
http://arxiv.org/abs/2008.10955