Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: "Liquid-gas" transition in the supercritical region: Fundamental changes
  in the particle dynamics   Recently, we have proposed a new dynamic line on the phase diagram in the
supercritical region. Crossing this line corresponds to the radical changes of
the fluid properties. Here, we focus on the dynamics of model Lennard-Jones and
Soft-Sphere fluids. We show that the change of the dynamics from the
liquid-like to gas-like can be established on the basis of the velocity
autocorrelation function and mean-square displacement. Using the rigorous
criterion, we show that the crossover of particle dynamics and key liquid
properties occurs at the same line. We further show that positive sound
dispersion disappears in the vicinity of this line in both kinds of systems.
The dynamic line bears no relationship to the existence of the critical point.
We find that the region of existence of liquid-like dynamics narrows with the
increase of the exponent of the repulsive part of inter-particle potential.

21
The categories of this paper are: adap-org
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
31
The categories of this paper are: ao-sci
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
1
The categories of this paper are: cs
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
24
The categories of this paper are: dg-ga
27
The categories of this paper are: comp-gas