Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Direct Detection of the Cosmic Neutrino Background Including Light
  Sterile Neutrinos   Current cosmological data drop an interesting hint about the existence of
sub-eV sterile neutrinos, which should be a part of the cosmic neutrino
background (C$\nu$B). We point out that such light sterile neutrinos may leave
a distinct imprint on the electron energy spectrum in the capture of relic
electron neutrinos by means of radioactive beta-decaying nuclei. We examine
possible signals of sterile neutrinos relative to active neutrinos,
characterized by their masses and sensitive to their number densities, in the
reaction $\nu^{}_e + ~^3{\rm H} \to ~^3{\rm He} + e^-$ against the
corresponding tritium beta decay. We stress that this kind of direct laboratory
detection of the C$\nu$B and its sterile component might not be hopeless in the
long term.

11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga
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The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
9
The categories of this paper are: nlin