Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Positivity of QCD at asymptotic density   In this talk, I try to show that the sign problem of dense QCD is due to
modes whose frequency is higher than the chemical potential. An effective
theory of quasi-quarks near the Fermi surface has a positive measure in the
leading order. The higher-order corrections make the measure complex, but they
are suppressed as long as the chemical potential is sufficiently larger than
$\Lambda_{\rm QCD}$. As a consequence of the positivity of the effective
theory, we can show that the global vector symmetries except the U(1) baryon
number are unbroken at asymptotic density.

31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
24
The categories of this paper are: dg-ga
17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
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
34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con