Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Realistic Dirac Leptogenesis   We present a model of leptogenesis that preserves lepton number. The model
maintains the important feature of more traditional leptogenesis scenarios: the
decaying particles that provide the CP violation necessary for baryogenesis
also provide the explanation for the smallness of the neutrino Yukawa
couplings. This model clearly demonstrates that, contrary to conventional
wisdom, neutrinos need not be Majorana in nature in order to help explain the
baryon asymmetry of the universe.

17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
18
The categories of this paper are: econ
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat