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dc.contributor.author
Miniati, Francesco
dc.contributor.author
Elyiv, Andrii
dc.date.accessioned
2017-06-10T12:25:20Z
dc.date.available
2017-06-10T12:25:20Z
dc.date.issued
2012
dc.identifier.uri
http://hdl.handle.net/20.500.11850/61307
dc.description.abstract
The stability properties of a low density ultra relativistic pair beam produced in the intergalactic medium by multi-TeV gamma-ray photons from blazars are analyzed. The problem is relevant for probes of magnetic field in cosmic voids through gamma-ray observations. In addition, dissipation of such beams could affect considerably the thermal history of the intergalactic medium and structure formation. We use a Monte Carlo method to quantify the shower properties, in particular the bulk Lorentz factor and the angular spread of the beam, as a function of distance from the blazar. We find that the fastest growing modes, like any perturbation mode with even a very modest component perpendicular to the beam direction, requires a kinetic treatment. Combined with the effect of non-linear Landau damping, which suppresses the growth of plasma oscillations, the beam relaxation timescale is found typically longer than a Hubble time. Finally, density inhomogeneities associated with cosmic structure induce severe loss of resonance between the beam particles and plasma oscillations, strongly inhibiting their growth. We conclude that relativistic pair beams produced by blazars in the intergalactic medium are stable on timescales much longer compared to the electromagnetic cascade's. There appears to be no effect of pair-beams on the intergalactic medium.
dc.language.iso
en
dc.publisher
Cornell University
dc.title
Relaxation of Blazar Induced Pair Beams in Cosmic Voids
dc.type
Working Paper
ethz.title.subtitle
Measurement of Magnetic Field in Voids and Thermal History of the IGM
ethz.pages.start
arXiv:1208.1761
ethz.size
7 p.
ethz.notes
Submitted 8 August 2012.
ethz.publication.place
Ithaca, NY
ethz.publication.status
published
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02010 - Dep. Physik / Dep. of Physics::03613 - Lilly, Simon / Lilly, Simon
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02010 - Dep. Physik / Dep. of Physics::03613 - Lilly, Simon / Lilly, Simon
ethz.identifier.url
http://arxiv.org/abs/1208.1761
ethz.date.deposited
2017-06-10T12:25:58Z
ethz.source
ECIT
ethz.identifier.importid
imp593650320deed28275
ethz.ecitpid
pub:97716
ethz.eth
yes
ethz.availability
Metadata only
ethz.rosetta.installDate
2017-07-19T01:44:33Z
ethz.rosetta.lastUpdated
2018-11-02T07:33:33Z
ethz.rosetta.versionExported
true
ethz.COinS
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