Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Shear viscosity of a universal Fermi gas near the superfluid phase
  transition   We precisely measure the shear viscosity for a resonantly interacting Fermi
gas as a function of temperature, from nearly the ground state through the
superfluid phase transition at a critical temperature $T_c$. Using an iterative
method to invert the data, we extract the {\it local} shear viscosity
coefficient $\alpha_S(\theta)$ versus reduced temperature $\theta$, revealing
previously hidden features. We find that $\alpha_S$ begins to decrease rapidly
with decreasing $\theta$ well above $T_c$, suggesting that preformed pairs play
an important role. Further, we observe that the derivative $\alpha_S'(\theta)$
has a maximum at $T_c$. We compare the local data to several microscopic
theories. Finally, we determine the local ratio of the shear viscosity to the
entropy density.

7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
1
The categories of this paper are: cs