Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Status of rates and rate equations for thermal leptogenesis   In many realizations of leptogenesis, heavy right-handed neutrinos play the
main role in the generation of an imbalance between matter and antimatter in
the early Universe. Hence, it is relevant to address quantitatively their
dynamics in a hot and dense environment by taking into account the various
thermal aspects of the problem at hand. The strong washout regime offers an
interesting framework to carry out calculations systematically and reduce
theoretical uncertainties. Indeed, any matter-antimatter asymmetry generated
when the temperature of the hot plasma $T$ exceeds the right-handed neutrino
mass scale $M$ is efficiently erased, and one can focus on the temperature
window $T \ll M$. We review recent progresses in the thermal field theoretic
derivation of the key ingredients for the leptogenesis mechanism: the
right-handed neutrino production rate, the CP asymmetry in the heavy-neutrino
decays and the washout rates. The derivation of evolution equations for the
heavy-neutrino and lepton-asymmetry number densities, their rigorous
formulation and applicability are also discussed.

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The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
30
The categories of this paper are: q-alg
19
The categories of this paper are: eess
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The categories of this paper are: math
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
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The categories of this paper are: astro-ph