Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Particle mixing, flavor condensate and dark energy   The mixing of neutrinos and quarks generate a vacuum condensate that, at the
present epoch, behaves as a cosmological constant. The value of the dark energy
is constrained today by the very small breaking of the Lorentz invariance.

4
The categories of this paper are: cond-mat
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph