Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Kaon Condensation in ``Nuclear Star" Matter   The critical density for kaon condensation in ``nuclear star" matter is
computed up to two-loop order {\it in medium} (corresponding to
next-to-next-to-leading order in chiral perturbation theory in free space) with
a heavy-baryon effective chiral Lagrangian whose parameters are determined from
$KN$ scattering and kaonic atom data. To the order considered, the kaon
self-energy has highly non-linear density dependence in dense matter. We find
that the four-Fermi interaction terms in the chiral Lagrangian play an
important role in triggering condensation, predicting for ``natural" values of
the four-Fermi interactions a rather low critical density, $\rho_c < 4 \rho_0$.

7
The categories of this paper are: hep-th
26
The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph
28
The categories of this paper are: alg-geom
30
The categories of this paper are: q-alg
17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con