Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Comment on "Large Fluctuations for Spatial Diffusion of Cold Atoms"
  [arXiv:1701.03357]   A comment on the Letter by E. Aghion, D. Kessler, and E. Barkai, Phys. Rev.
Lett. 118, 260601 (2017). An important criterion on finite kinetic temperature
of the system of cold atoms is established. It is shown that the kinetic
temperature becomes infinite in Fig. 1 of the commented paper in the course of
time, i.e. the considered model system becomes asymptotically infinitely hot.
Moreover, within this model the behavior of the squared width of the spatial
distribution of atoms at the half of its maximum is very different from the
variance of the particle positions. In particular, in the discussed Fig. 1 the
former one increases sub-ballistically in time, while the variance grows
super-ballistically, which corresponds to a heating phase. This leads to a
profound ambiguity in definition and classification of anomalous diffusion. All
in all, the model in the commented paper simply does not fit to experiments
with cold atoms.

11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
19
The categories of this paper are: eess
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
2
The categories of this paper are: math
27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio