Reconnection and shocks in magnetically-dominated plasmas Lorenzo Sironi (Columbia University) Magnetic fields can be the dominant component of astrophysical plasmas, so that the magnetic energy density might exceed even the rest-mass energy density of matter. This plasma regime, applicable to a variety of astrophysical sources — magnetars, pulsars and pulsar wind nebulae (PWNe), jets of Active Galactic Nuclei (AGNs) and Gamma-Ray Bursts (GRBs) — is dramatically different from laboratory plasmas, the magnetospheres of planets, and the interplanetary plasma. With first-principles particle-in-cell (PIC) fullykinetic simulations, we show that reconnection in magnetically-dominated AGN jets satisfies all the basic conditions for the emission: extended non-thermal distributions of accelerated particles (with power-law slope between -2 and -1), efficient dissipation and rough equipartition between particles and magnetic field in the emitting region. In addition, we demonstrate that ultra-relativistic magnetic islands generated by reconnection in the jet can power the ultra-fast bright flares observed from a number of TeV blazars. Unlike reconnection, perpendicular shocks in magnetically-dominated plasmas are not efficient particle accelerators. While thermalizing, the incoming particles gyrate in the shock-compressed fields and radiate a strong quasi-coherent precursor wave into the upstream medium. We study with multi-dimensional PIC simulations the amplitude and spectrum of the precursor wave in magnetically-dominated shocks, as a potential mechanism for producing the bursts of millisecond duration recently discovered in the GHz band (i.e., the fast radio bursts).
Reconnection and shocks in magnetically-dominated ...
of planets, and the interplanetary plasma. With first-principles particle-in-cell (PIC) fully- kinetic simulations, we show that reconnection in magnetically-dominated AGN ... gyrate in the shock-compressed fields and radiate a strong quasi-coherent precursor wave into the upstream medium. We study with multi-dimensional ...
de Val`encia and the 2008 ADRES/EDHEC conference on 'Labor Market Outcomes: ..... call for business cycle models where this overshooting property of labor ...
What is the effect of technology shocks on hours/employment? .... Technology Shocks and Job. Flows! .... Variance Decomposition at Business Cycle Frequency.
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Nakamura: Graduate School of Business, Columbia University, 3022 ... Go to https://doi.org/10.1257/mac.20150250 to visit the article page for ...... Perhaps the best way to illustrate the importance of long-run risks in our esti- ...... to sample fro
This paper estimates, using a large panel data set from rural Bangladesh, the effects of health shocks on ..... collected by a survey of village shopkeepers and this information was only used in special cases. These values are then deflated using the
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of matching-specific productivity for endogenous separation is still at the very left tail of the lognormal distribution, where the density is fairly low. That means a decrease in the threshold of endogenous separation will not reduce the endogenous
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Oct 31, 2013 - Page 1 ... for various measures of the business cycle, micro uncertainty and forecast dispersion are both related to macro ... signals can create dispersion in forecasts and in earnings, which is micro uncertainty. But how do ...
Aug 23, 2010 - generating a negative comovement between unemployment and job vacancies (Abraham and. Katz, 1986). And models of wage rigidities ran ...
so once again the determinant of A is positive. Therefore, the system represented by (21) and (22) is globally unstable. If the eigenvalues associated with the ...
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Jun 8, 2017 - SED, Arizona State, Yale, Texas A&M, and the SFS Cavalcade. 1 ... 1For past work on the relationship of uncertainty and the business cycle, see, among others, Alexopoulos and ... The news shocks are also not small.
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Jun 8, 2017 - TFP shocks: surprise innovations in TFP, and news about the future level of TFP that has no ... 1For past work on the relationship of uncertainty and the business cycle, see, among others ... The news shocks are also not small.
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