Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Effect of Neutrino Heating on Primordial Nucleosynthesis   We have modified the standard code for primordial nucleosynthesis to include
the effect of the slight heating of neutrinos by $e^\pm$ annihilations. There
is a small, systematic change in the $^4$He yield, $\Delta Y \simeq +1.5\times
10^{-4}$, which is insensitive to the value of the baryon-to-photon ratio
$\eta$ for $10^{-10}\la \eta \la 10^{-9}$. We also find that the
baryon-to-photon ratio decreases by about 0.5\% less than the canonical factor
of 4/11 because some of the entropy in $e^\pm$ pairs is transferred to
neutrinos. These results are in accord with recent analytical estimates.

29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
1
The categories of this paper are: cs
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
26
The categories of this paper are: bayes-an
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga