  Fuzzy dark matter (FDM) has dynamical properties that differ significantly
from cold dark matter (CDM). These dynamical differences are strongly
manifested on the spatial scale of dwarf spheroidal galaxies (dSphs), which
roughly corresponds to the de Broglie wavelength of a canonical mass FDM
particle. We study simulations of a dSph satellite which is tidally perturbed
by its host galaxy, in order to identify dynamical signatures that are unique
to FDM, and to quantify the imprints of such perturbations on an observable
stellar tracer population. We find that a perturbed FDM soliton develops a
long-standing breathing mode, whereas for CDM such a breathing mode quickly
phase-mixes and disappears. We also demonstrate that such signatures become
imprinted on the dynamics of a stellar tracer population, making them
observable with sufficiently precise astrometric measurements.
