Velocity decorrelation functions of high-energy cosmic rays propagating in magnetic fields
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A90232%2F24%3A00641978" target="_blank" >RIV/68378271:90232/24:00641978 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1103/PhysRevD.110.023005" target="_blank" >https://doi.org/10.1103/PhysRevD.110.023005</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevD.110.023005" target="_blank" >10.1103/PhysRevD.110.023005</a>
Alternative languages
Result language
angličtina
Original language name
Velocity decorrelation functions of high-energy cosmic rays propagating in magnetic fields
Original language description
Diffusion tensor coefficients play a central role in describing cosmic-ray transport in various astrophysical environments permeated with magnetic fields, which are usually modeled as a fluctuating field on top of a mean field. In this article, a formal derivation of these coefficients is presented by means of the calculation of velocity decorrelation functions of particles. It relies mainly on expanding the two-point correlation function of the (fluctuating) magnetic field experienced by the particles between two successive times in the form of an infinite Dyson series and retaining a class of terms that converge to a physical solution. Subsequently, the velocity decorrelation functions, themselves expressed as Dyson series, are deduced from an iteration procedure that improves on the partial summation scheme. The results are shown to provide approximate solutions compared to those obtained by Monte Carlo simulations as long as the Larmor radius of the particles is larger than at least one tenth of the largest scale of the turbulence.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10303 - Particles and field physics
Result continuities
Project
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Continuities
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Others
Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Physical Review D
ISSN
2470-0010
e-ISSN
2470-0029
Volume of the periodical
110
Issue of the periodical within the volume
2
Country of publishing house
US - UNITED STATES
Number of pages
16
Pages from-to
023005
UT code for WoS article
001291091700026
EID of the result in the Scopus database
2-s2.0-85198301988