Pitch-angle diffusion and Bohm-type approximations in diffusive shock acceleration

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dc.contributor.authorRiordan, John Daniel
dc.contributor.authorPe’er, Asaf
dc.contributor.funderSeventh Framework Programmeen
dc.date.accessioned2019-04-10T11:46:22Z
dc.date.available2019-04-10T11:46:22Z
dc.date.issued2019-02-27
dc.description.abstractThe problem of accelerating cosmic rays is one of fundamental importance, particularly given the uncertainty in the conditions inside the acceleration sites. Here we examine diffusive shock acceleration in arbitrary turbulent magnetic fields, constructing a new model that is capable of bridging the gap between the very weak (δB/B 0 Lt 1) and the strong turbulence regimes. To describe the diffusion we provide a quantitative analytical description of the "Bohm exponent" in each regime. We show that our results converge to the well known quasi-linear theory in the weak turbulence regime. In the strong regime, we quantify the limitations of the Bohm-type models. Furthermore, our results account for the anomalous diffusive behavior which has been noted previously. Finally, we discuss the implications of our model in the study of possible acceleration sites in different astronomical objects.en
dc.description.statusPeer revieweden
dc.description.versionPublished Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.articleid13en
dc.identifier.citationRiordan, J. D. and Pe’er, A. (2019) ‘Pitch-angle diffusion and Bohm-type approximations in diffusive shock acceleration’, Astrophysical Journal, 873(1), 13 (12pp). doi: 10.3847/1538-4357/aaffd2en
dc.identifier.doi10.3847/1538-4357/aaffd2en
dc.identifier.eissn1538-4357
dc.identifier.endpage12en
dc.identifier.issn0004-637X
dc.identifier.issued1en
dc.identifier.journaltitleAstrophysical Journalen
dc.identifier.startpage1en
dc.identifier.urihttps://hdl.handle.net/10468/7742
dc.identifier.volume873en
dc.language.isoenen
dc.publisherIOP Publishing on behalf of the American Astronomical Societyen
dc.relation.projectinfo:eu-repo/grantAgreement/EC/FP7::SP3::PEOPLE/618499/EU/Transient-Sky/TRANSIENT-SKYen
dc.relation.urihttps://iopscience.iop.org/article/10.3847/1538-4357/aaffd2/meta
dc.rights© 2019, American Astronomical Society. All rights reserved.en
dc.subjectAcceleration of particlesen
dc.subjectCosmic raysen
dc.subjectMethods: numericalen
dc.subjectScatteringen
dc.subjectTurbulenceen
dc.titlePitch-angle diffusion and Bohm-type approximations in diffusive shock accelerationen
dc.typeArticle (peer-reviewed)en
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