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Plasma Instabilities in Electron-Positron Pair Beams from Blazars

Hornkjøl, Martin
Master thesis
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URI
http://hdl.handle.net/11250/2501067
Date
2018
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Abstract
The non-detection of an electromagnetic cascade in the electron-positron plasma

beams from blazars has led many physicists to invoke an intergalactic magnetic

eld that de

ects charged particles away from our eld of view. In this thesis we

look at a dierent explanation. Namely that the beams loose their energy through

plasma instabilities rather than the inverse Compton scattering which would create

the cascade. We use a covariant formalism to calculate the linear response tensor

of the plasma. Using this tensor we nd the absorption coecient for particles

distributed according to the Jüttner distribution and for a dierent distribution

based on simulations. The absorption coecient is found to diverge for specic

values of the phase velocity when the electric eld of the mode vanishes. This is

unphysical, which means there is some issue with the calculations. The issue is

identied as the assumption that the imaginary part of the frequency, known as the

absorption coecient, is small. This assumption contradicts the results making the

calculations invalid. To solve this problem one would have to redo the calculations

avoiding this assumption.
Publisher
NTNU

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