  We study the expansion dynamics of a one dimensional polarized Fermi gas
after sudden release from confinement using both the mean-field Bogoliubov-de
Gennes and the numerically exact Time-Evolving Block Decimation methods. Our
results show that experimentally observable spin density modulations directly
related to the presence of a Fulde-Ferrel-Larkin-Ovchinnikov (FFLO) state
develop during the expansion of the cloud, providing incontrovertible evidence
of this long-sought state.
