Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the chaoticity of active-sterile neutrino oscillations in the early
  universe   We have investigated the evolution of the neutrino asymmetry in
active-sterile neutrino oscillations in the early universe. We find that there
are large regions of parameter space where the asymmetry is extremely sensitive
to variations in the initial asymmetry as well as the external parameters (the
mass difference and the mixing angle). In these regions the system undergoes
chaotic transitions; however, the system is never truly chaotic in the sense
that all information about initial conditions is lost. In some cases though,
enough information is lost that the final sign of the neutrino asymmetry is
stochastic. We discuss the implications of our findings for Big Bang
nucleosynthesis (BBN) and the cosmic microwave background (CMB).

17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
24
The categories of this paper are: dg-ga
2
The categories of this paper are: math
4
The categories of this paper are: cond-mat
13
The categories of this paper are: quant-ph