Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: First-order Phase Transition and Resulted Expansion in Momentum Space   We point out, according to the principle of entropy growth, that the volume
occupied by the system in the momentum space should expand during the
first-order phase transition. Such an expansion is visualized by the simulation
using the transport model based on a NJL-typed Lagrangian, and quantified by
several observables, some of which, proposed for the first time in this
article, could be the probes of the first-order phase transition either between
the quark gluon plasma and the hadronic phase taking place in the heavy-ion
collisions or of the other expanding systems.

5
The categories of this paper are: gr-qc
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an
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The categories of this paper are: q-fin
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The categories of this paper are: q-alg
2
The categories of this paper are: math
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: hep-th