Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: $SU(4)$-Ward identities for QCD with restored chiral symmetry   Lattice studies of QCD at temperatures above the chiral restoration and QCD
with truncated low modes of the Dirac operator indicate approximate and
explicit $SU(4)$ degeneracies in hadron spectra, respectively. At the same
time, the QCD classical action and the path integral measure are not invariant
under $SU(4)$. Here we investigate $SU(4)$ transformations in the continuum
limit by deriving corresponding Ward identities. We show that, if there is a
gap in low-lying modes of the Dirac operator the obtained $SU(4)$ Ward
identities are simplified and look like they would be if $SU(4)$ symmetry is
preserved. Then, we discuss possible consequences for the quark matter at high
temperatures.

14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
30
The categories of this paper are: q-alg
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int