We study
$N$ non-interacting fermions in a trap. Using random matrix theory
(RMT)
we
calculate various observables in the ground state, focusing on
large $N$.
In the
bulk, agreement with local density approximation (LDA) is
recovered. At the
edge of
the Fermi gas however LDA fails, while RMT leads to predictions
which we
show are
universal, independent of the details of the trap potential. In
particular the
position
of the right most fermion fluctuates according to the celebrated
Tracy Widom law.
We then
extend these results to finite temperature and arbitrary space
dimension,
providing
new universal predictions for correlations. These could in
principle be tested
in
experiments using the Fermi gas microscope. A surprising
connection to the stochastic growth
Kardar-Parisi-Zhang
equation also emerges from our study.
Based
on the following works:
D.S. Dean, P. Le Doussal, S.N. Majumdar and G.Schehr
Phys. Rev. Lett. 114, 110402 (2015)
Europhys. Lett. 112, 60001 (2015)
Phys. Rev. A 94, 063622 (2016)
arXiv:1612.03954