Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the ultra high energy cosmic rays and the origin of the cosmic
  microwave background radiation   Some inconsistencies to the assumption of a cosmological origin of the cosmic
microwave background CMB, such as the absence of gravitational lensing in the
WMAP data, open the doors to some speculations such as a local origin to the
CMB. We argue here that this assumption agrees with the absence of the GZK
cutoff (at least according to AGASA data) in the energy spectrum of the cosmic
ray due to the cosmic interaction with the CMB at $6\times 10^{19} eV$ or
above. Within 50 Mpc from Earth, the matter and light distributions are close
to an anisotropic distribution, where the local cluster and local
super-clusters of galaxies can be identified. In contrast, the ultra high
energy comic rays data is consistent to an almost isotropic distribution, and
there is no correlation between their arrival direction and astronomical
sources within our local cluster. This means that the events above the GZK
cutoff come from distances above 50 Mpc, without an apparent energy loss. This
scenario is plausible under the assumption of the CMB concentrated only within
3-4 Mpc from Earth. In other words, the CMB has a local origin linked only to
the local super-cluster of galaxies. In addition, the galactic and
extragalactic energy spectra index within the energy equipartition theorem
strongly constrains the dark matter and dark energy hypothesis, essential in
the Big Bang cosmology.

34
The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
2
The categories of this paper are: math
19
The categories of this paper are: eess
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
5
The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas