Tiny Electromagnetic Explosions

doi:10.3847/1538-4357/aa7845

2017-08-03

Christopher Thompson *

DOI：10.3847/1538-4357/aa7845

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This paper considers electromagnetic transients of a modest total energy (epsilon greater than or similar to 10(40) erg) and small initial size (R greater than or similar to 10(-1) cm). They could be produced during collisions between relativistic field structures (e.g., macroscopic magnetic dipoles) that formed around or before cosmic electroweak symmetry breaking. The outflowing energy has a dominant electromagnetic component; a subdominant thermal component (temperature > 1GeV) supplies inertia in the form of residual e(+/-). A thin shell forms, expanding subluminally and attaining a Lorentz factor similar to 10(6-7) before decelerating. Drag is supplied by the reflection of an ambient magnetic field and deflection of ambient free electrons. Emission of low-frequency (GHz-THz) superluminal waves takes place through three channels: (i) reflection of the ambient magnetic field; (ii) direct linear conversion of the embedded magnetic field into a superluminal mode; and (iii) excitation outside the shell by corrugation of its surface. The escaping electromagnetic pulse is very narrow (a few wavelengths), so the width of the detected transient is dominated by propagation effects. GHz radio transients are emitted from (i) the dark matter halos of galaxies and (ii) the near-horizon regions of supermassive black holes that formed via direct gas collapse and now accrete slowly. Brighter and much narrower 0.01-1 THz pulses are predicted at a rate at least comparable to fast radio bursts, experiencing weaker scattering and absorption. The same explosions also accelerate protons up to similar to 10(19) eV, and heavier nuclei up to 10(20-21) eV.

Keyword:

acceleration of particles

dark matter

magnetic fields

plasmas

radiation mechanisms: non-thermal

relativistic processes

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期刊

Astrophysical Journal

IF:

5.4

论文数:

8.3W

被引数:

32.0W

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