Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Where are the Ultra High Energy Cosmic Ray (UHECR) originated?   We consider the recent results on UHECR (Ultra High Energy Cosmic Ray)
composition and their distribution in the sky from ten EeV energy (the dipole
anisotropy) up to the highest UHECR energies and their clustering maps: UHECR
have been found mostly made by light and lightest nuclei. We summarized the
arguments that favor a few localized nearby extragalactic sources for most
UHECR as CenA, NG 253, M82. We comment also on the possible partial role of a
few remarkable galactic UHECR sources. Finally we revive the eventual role of a
relic neutrino eV mass in dark hot halo (hit by ZeV neutrinos) to explain the
new UHECR clustering events centered around a very far cosmic AGN sources as 3C
454.

28
The categories of this paper are: alg-geom
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
4
The categories of this paper are: cond-mat
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int