Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Analysis of the SN1987A two-stage explosion hypothesis with account for
  the MSW neutrino flavour conversion   Detection of 5 events by the Liquid Scintillation Detector (LSD) on February,
23, 1987 was interpreted in the literature as the detection of neutrinos from
the first stage of the two-stage supernova collapse. We pose rigid constraints
on the properties of the first stage of the collapse, taking into account
neutrino flavour conversion due to the MSW-effect and general properties of
supernova neutrino emission. The constraints depend on the unknown neutrino
mass hierarchy and mixing angle \theta_{13}.

4
The categories of this paper are: cond-mat
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The categories of this paper are: stat
5
The categories of this paper are: gr-qc
11
The categories of this paper are: hep-lat
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th