Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dark Matter, Gravity Waves, Higgs Bosons and other Elusive Entities   The twentieth century has thrown up exotic concepts -- dark matter, gravity
waves, Higgs Bosons, Magnetic Monopoles and so on. The sad truth is that even
after several decades, these remain elusive to observation and experiment. Some
are now questioning these conjectures. Their verification has become a matter
more of hope than conviction. We will examine some alternatives in the light of
the above pointing out that, on the other hand, an extra neutrino, recently
predicted by the author may have just been discovered.

18
The categories of this paper are: econ
9
The categories of this paper are: nlin
2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an
19
The categories of this paper are: eess
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con