Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Probing the environments surrounding ultrahigh energy cosmic ray
  accelerators and their implications for astrophysical neutrinos   We explore inferences on ultrahigh energy cosmic ray (UHECR) source
environments -- constrained by the spectrum and composition of UHECRs and
non-observation of extremely high energy neutrinos -- and their implications
for the observed high energy astrophysical neutrino spectrum. We find
acceleration mechanisms producing power-law CR spectra~$\propto E^{-2}$ are
compatible with UHECR data, if CRs at high rigidities are in the
quasi-ballistic diffusion regime as they escape their source environment. Both
gas-dominated and photon-dominated source environments are able to account for
UHECR observations, however photon-dominated sources give a better fit.
Additionally, gas-dominated sources are in tension with current neutrino
constraints. Accurate measurement of the neutrino flux at $\sim 10$ PeV will
provide crucial information on the viability of gas-dominated sources, as well
as whether diffusive shock acceleration is consistent with UHECR observations.
We also show that UHECR sources are able to give a good fit to the high energy
portion of the astrophysical neutrino spectrum, above $\sim$ PeV. This common
origin of UHECRs and high energy astrophysical neutrinos is natural if air
shower data is interpreted with the Sibyll2.3c hadronic interaction model,
which gives the best-fit to UHECRs and astrophysical neutrinos in the same part
of parameter space, but not for EPOS-LHC.

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The categories of this paper are: econ
3
The categories of this paper are: physics
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs
4
The categories of this paper are: cond-mat
7
The categories of this paper are: hep-th