Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The critical points of lattice QCD with a non--zero quark density   We study the interplay of quark number density and chiral symmetry in lattice
QCD. We suggest that both are controlled by the eigenvalue spectrum of the
fermionic propagator matrix, which shapes the pattern of zeros of the partition
function. The onset of the quark current would be triggered by the lowest lying
eigenvalue, the chiral transition by the density of zeros, the two critical
points being distinct in full QCD, and coincident in the quenched
approximation. Our preliminary estimate for the critical point in full QCD in
the infinite couling limit compares favourably with the predictions of the
strong coupling expansions and of numerical simulations based on exact,
alternative representations of the partition function. Several reasons of
perplexity however remain, which are briefly discussed.

17
The categories of this paper are: q-fin
23
The categories of this paper are: solv-int
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
21
The categories of this paper are: adap-org
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
18
The categories of this paper are: econ
3
The categories of this paper are: physics
22
The categories of this paper are: chao-dyn