Whence particle acceleration (2009)
Medvedev, M. V., Spitkovsky, A.
We discuss how the electrons in relativistic GRB shocks can reach near-equipartition in energy with the protons. We emphasize the non-Fermi origin of such acceleration. We argue that the dynamics of...
Lukoyanov, A. V., Medvedev, M. V., Nekrasov, I. A.
In the framework of the LSDA+U method electronic structure and magnetic properties of the intermetallic compound Gd2Fe17 for both rhombohedral and hexagonal phases have been calculated. On top of...
Atmospheric Consequences of Cosmic Ray Variability in the Extragalactic Shock Model (2008)
Melott, A. L., Krejci, A. J., Thomas, B. C., Medvedev, M. V., Wilson, G. W., Murray, M. J.
It has been suggested that galactic shock asymmetry induced by our galaxy infall toward the Virgo Cluster may be a source of periodicity in cosmic ray exposure as the solar system oscillates normal...
B. Buti, V. L. Galinski, V. I. Shevchenko, G. S. Lakhina, B. T. Tsurutani, B. E. Goldstein, ...
5E-mail: bbutiO. jplsp.jpl.nasa.gov Nonlinear evolution equation for Alfvn waves, propagating in streaming plasmas with nonuniform densities and inhomogeneous magnetic fields, is obtained by using...
Evolution of Nonlinear Alfven Waves in the Interplanetary Medium (2004)
Nonlinear evolution equation for Alfven waves, propagating in streaming plasmas with nonuniform densities and inhomogeneous magnetic fields, is obtained by using reductive perturbation technique.
Silva, L. O., Fonseca, R. A., Tonge, J., Dawson, J. M., Mori, W. B., Medvedev, M. V.
We present the first three-dimensional fully kinetic electromagnetic relativistic particle-in-cell simulations of the collision of two interpenetrating plasma shells. The highly accurate...
Thermodynamics of photons in relativistic $e^+e^-\gamma$ plasmas (1999)
Thermodynamic and spectral properties of a photon gas in $e^+e^-\gamma$ plasmas are studied. The effect of a finite effective mass of a photon, associated with the plasma frequency cutoff, is...
The magnetic energy of nonlinear Alfven waves in compressible plasmas may be ponderomotively coupled only to ion-acoustic quasi-modes which modulate the wave phase velocity and cause wave-front...
Self-Organized States in Cellular Automata: Exact Solution (1998)
Medvedev, M. V., Diamond, P. H.
The spatial structure, fluctuations as well as all state probabilities of self-organized (steady) states of cellular automata can be found (almost) exactly and {\em explicitly} from their Markovian...
The Photino Induced Distortion of the CMBR Blackbody Spectrum (1998)
It is shown that photon--photino inter-conversions (if exist) may result in a detectable CMBR spectrum distortion which amplitude depends on photino properties, such as its mass. An upper bound on...
On the Functional Integral Theory of Systems with Kinematical Interaction (1998)
Popovich, L. V., Medvedev, M. V.
We propose a systematic way to investigate the low-temperature thermodynamic properties of quantum spin systems subject to the restriction that only a finite number of bosons may occupy a single...
Asymptotic Theory of Particle Trapping in Coherent Nonlinear Alfven Waves (1998)
Medvedev, M. V., Diamond, P. H., Rosenbluth, M. N., Shevchenko, V. I.
A fully nonlinear, time-asymptotic theory of resonant particle trapping in large-amplitude quasi-parallel Alfven waves is presented. The effect of trapped particles on the nonlinear dynamics of...
Dissipative Dynamics of Collisionless Nonlinear Alfven Wave Trains (1997)
Medvedev, M. V., Diamond, P. H., Shevchenko, V. I., Galinsky, V. L.
The nonlinear dynamics of collisionless Alfven trains, including resonant particle effects is studied using the kinetic nonlinear Schroedinger (KNLS) equation model. Numerical solutions of the KNLS...
Fluid Models for Kinetic Effects on Coherent Nonlinear Alfven Waves. I. Fundamental Theory (1996)
Medvedev, M. V., Diamond, P. H.
Collisionless regime kinetic models for coherent nonlinear Alfven wave dynamics are studied using fluid moment equations with an approximate closure anzatz. Resonant particle effects are modelled by...
Fluid Models for Kinetic Effects on Coherent Nonlinear Alfven Waves. II. Numerical Solutions (1996)
Medvedev, M. V., Shevchenko, V. I., Diamond, P. H., Galinsky, V. L.
The influence of various kinetic effects (e.g. Landau damping, diffusive and collisional dissipation, and finite Larmor radius terms) on the nonlinear evolution of finite amplitude Alfvenic wave...
Medvedev, M. V., Diamond, P. H.
The saturation of ion cyclotron Alfven turbulence excited by beam particles is investigated using resonance broadening theory. The stochastic scattering which decorrelates particles, includes both...
Towards a Simple Model of Compressible Alfvenic Turbulence (1996)
Medvedev, M. V., Diamond, P. H.
A simple model collisionless, dissipative, compressible MHD (Alfvenic) turbulence in a magnetized system is investigated. In contrast to more familiar paradigms of turbulence, dissipation arises from...
Properties of Particles Obeying Ambiguous Statistics (1996)
A new class of identical particles which may exhibit both Bose and Fermi statistics with respective probabilities $p_b$ and $p_f$ is introduced. Such an uncertainity may be either an intrinsic...