Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Verification of universal relations in a strongly interacting Fermi gas   Many-body fermion systems are important in many branches of physics,
including condensed matter, nuclear, and now cold atom physics. In many cases,
the interactions between fermions can be approximated by a contact interaction.
A recent theoretical advance in the study of these systems is the derivation of
a number of exact universal relations that are predicted to be valid for all
interaction strengths, temperatures, and spin compositions. These equations,
referred to as the Tan relations, relate a microscopic quantity, namely, the
amplitude of the high-momentum tail of the fermion momentum distribution, to
the thermodynamics of the many-body system. In this work, we provide
experimental verification of the Tan relations in a strongly interacting gas of
fermionic atoms. Specifically, we measure the fermion momentum distribution
using two different techniques, as well as the rf excitation spectrum and
determine the effect of interactions on these microscopic probes. We then
measure the potential energy and release energy of the trapped gas and test the
predicted universal relations.

9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph
18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
2
The categories of this paper are: math
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
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The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph