Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Phase transition towards strange matter   The phase diagram of a system constituted of neutrons and $\Lambda$-hyperons
in thermal equilibrium is evaluated in the mean-field approximation. It is
shown that this simple system exhibits a complex phase diagram with first and
second order phase transitions. Due to the generic presence of attractive and
repulsive couplings, the existence of phase transitions involving strangeness
appears independent of the specific interaction model. In addition we will show
under which conditions a phase transition towards strange matter at high
density exists, which is expected to persist even within a complete treatment
including all the different strange and non- strange baryon states. The impact
of this transition on the composition of matter in the inner core of neutron
stars is discussed.

28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
16
The categories of this paper are: stat
1
The categories of this paper are: cs
4
The categories of this paper are: cond-mat
19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph