Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Three-generation neutrino mixing and LSND dark matter neutrinos   The reported signal at the LSND experiment, when interpreted as neutrino
mixing with $\delta m^2 = 6 \;\rm{eV}^2$, provides evidence for neutrinos with
a cosmologically significant mass. However, attempts to reconcile this
interpretation of the experiment with other hints about neutrino properties
require a (sterile) fourth neutrino and/or an ``inverted'' neutrino mass
hierarchy. An interpretation of the LSND experiment employing $\delta m^2 =
0.3\; \rm{eV}^2$, with three-generation mixing and a ``normal'' neutrino mass
hierarchy, can just barely be reconciled with the negative results of other
laboratory neutrino oscillation experiments and the positive hints of neutrino
oscillation from the solar and atmospheric neutrino problems. Though subject to
test by by future experiments, such a solution allows (but does not demand)
neutrino masses relevant for dark matter.

9
The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
11
The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an