Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Comment on "Experimental Evidence for a State-Point-Dependent
  Density-Scaling Exponent of Liquid Dynamics"   Recently Sanz et al. [A. Sanz, T. Hecksher, H.W. Hansen, J.C. Dyre, K. Niss,
and U.R. Pedersen, Phys. Rev. Lett. 122, 055501 (2019).] reported that the
scaling exponent gamma for tetramethyl-tetraphenyl-trisiloxane (DC704) varied
with temperature; i.e., was not a material constant. Such a finding is at odds
with previously published results on this compound and on more than 100 other
liquids and polymers. The result of Sanz et al. comes from their measurement of
a pressure dependence of the relaxation time at low temperature that becomes
weaker with increasing pressure. Such a result is unphysical and contrary to
the behavior of all known liquids. We re-measured this pressure dependence for
DC704 and find it to be linear over the studied range. Thus, the conclusion of
Sans et al. is incorrect; gamma for DC704 is state-point independent, in accord
with other simple liquids and polymers.

35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
2
The categories of this paper are: math
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con