Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: How big are the smallest drops of quark-gluon plasma?   Using holographic duality, we present results for both head-on and off-center
collisions of Gaussian shock waves in strongly coupled $\mathcal N = 4$
supersymmetric Yang-Mills theory. The shock waves superficially resemble
Lorentz contracted colliding protons. The collisions results in the formation
of a plasma whose evolution is well described by viscous hydrodynamics. The
size of the produced droplet is $R \sim 1/T_{\rm eff}$ where $T_{\rm eff}$ is
the effective temperature, which is the characteristic microscopic scale in
strongly coupled plasma. These results demonstrate the applicability of
hydrodynamics to microscopically small systems and bolster the notion that
hydrodynamics can be applied to heavy-light ion collisions as well as some
proton-proton collisions.

37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
21
The categories of this paper are: adap-org
6
The categories of this paper are: astro-ph
10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph