Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Resurrection of large lepton number asymmetries from neutrino flavor
  oscillations   We numerically solve the evolution equations of neutrino three-flavor density
matrices, and show that, even if neutrino oscillations mix neutrino flavors,
large lepton number asymmetries are still allowed in certain limits by Big Bang
Nucleosynthesis (BBN).

14
The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics
2
The categories of this paper are: math
7
The categories of this paper are: hep-th
5
The categories of this paper are: gr-qc
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
31
The categories of this paper are: ao-sci