Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Phase transitions in dense matter   As the density of matter increases, atomic nuclei disintegrate into nucleons
and, eventually, the nucleons themselves disintegrate into quarks. The phase
transitions (PT's) between these phases can vary from steep first order to
smooth crossovers, depending on certain conditions. First-order PT's with more
than one globally conserved charge, so-called non-congruent PT's, have
characteristic differences compared to congruent PT's. In this conference
proceeding we discuss the non-congruence of the quark deconfinement PT at high
densities and/or temperatures relevant for heavy-ion collisions, neutron stars,
proto-neutron stars, supernova explosions, and compact-star mergers.

5
The categories of this paper are: gr-qc
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
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The categories of this paper are: physics
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The categories of this paper are: hep-th