Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Role of Bag Surface Tension in Color Confinement   We discuss here the novel view at the color confinement which, on the one
hand, allows us to find out the surface tension coefficient of quark gluon bags
and, under a plausible assumption, to determine the endpoint temperature of the
QCD phase diagram, on the other hand. The present model considers the confining
color tube as the cylindrical quark gluon bag with non-zero surface tension. A
close inspection of the free energies of elongated cylindrical bag and the
confining color tube that connects the static quark-antiquark pair allows us to
find out the string tension in terms of the surface tension, thermal pressure
and the bag radius. Using the derived relation it is possible to estimate the
bag surface tension at zero temperature directly from the lattice QCD data and
to estimate the (tri)critical endpoint temperature. In the present analysis the
topological free energy of the cylindrical bag is accounted for the first time.
The requirement of positive entropy density of such bags leads to negative
values of the surface tension coefficient of quark gluon bags at the cross-over
region, i.e. at the continuous transition to deconfined quarks and gluons. We
argue that the cross-over existence at supercritical temperatures in ordinary
liquids is also provided by the negative surface tension coefficient values. It
is shown that the confining tube model naturally accounts for an existence of a
very pronounced surprising maximum of the tube entropy observed in the lattice
QCD simulations, which, as we argue, signals about the fractional surface
formation of the confining tube. In addition, using the developed formalism we
suggest the gas of free tubes model and demonstrate that it contains two
phases.

19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph
2
The categories of this paper are: math
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th