Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Neutrino Cosmology and Limits on Extended Technicolor   Using Big Bang Nucleosynthesis limits on the number of light neutrinos we
derive a cosmological lower bound of $\approx 2$ TeV on the scale of extended
technicolor interactions (or any other new interactions) for the third family
in models where heavy gauge bosons couple to both left and right-handed
neutrinos.

2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
23
The categories of this paper are: solv-int
18
The categories of this paper are: econ
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
22
The categories of this paper are: chao-dyn
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci