  We investigate nonlinear, higher-order dispersive equations with measure (or
even less regular) potentials and initial data with low regularity. Our
approach is of distributional nature and relies on the phase space analysis
(via Gabor wave packets) of the corresponding fundamental solution - in fact,
locating the modulation/amalgam space regularity of such generalized
Fresnel-type oscillatory functions is a problem of independent interest in
harmonic analysis.
