Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Galactic Magnetic Field Bias on Inferences from UHECR Data   A consequence of Liouville's theorem indicates that the recently observed
large scale anisotropy in the arrival direction of Ultra-High-Energy Cosmic
Rays (UHECRs) cannot be produced by the Galactic magnetic field, thus this
anisotropy already needs to be present outside our Galaxy. But in this case,
the observed energy spectrum and composition of UHECRs differs from the one
outside of the Milky Way, due to the suppression or the amplification of the
UHECR flux from certain directions by the Galactic magnetic field. In this
work, we investigate this effect for the case of a dipole and a quadrupole
anisotropy, respectively, for the widely-used JF12 magnetic field model. We
investigate boundaries on the maximal amplitude of the observed anisotropy and
the maximal charge number of UHECRs. Furthermore, the flux modification is
discussed in the light of the Auger data on the recent dipole and also the
chemical composition. We find that this modification effect yields a
modification of the observed flux of up to $\sim 10\%$ for the investigated
magnetic field model and the observed dipole, in particular for a heavy
chemical composition of UHECRs as suggested by the 'EPOS-LHC' model.

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The categories of this paper are: dg-ga
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The categories of this paper are: q-bio
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The categories of this paper are: adap-org
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The categories of this paper are: q-alg
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The categories of this paper are: atom-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: nlin
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
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The categories of this paper are: physics
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The categories of this paper are: acc-phys
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The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-ex
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The categories of this paper are: patt-sol
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The categories of this paper are: gr-qc
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The categories of this paper are: q-fin