The kinetics of Doppler-effect excitation of drift density waves

A specific differential effect of peculiar stellar motions in differentially rotating galaxies is investigated: the excitation of density waves by drift motions of stars (drift density waves), which is governed by the interaction of the density-wave field with field stars. A quasi-linear approximation is used to examine the kinetics of high-frequency density-drift-wave excitation arising as a result of the Doppler effect. A local analysis is performed to study the reciprocal effect of small oscillations in a differentially rotating galaxy on the stellar phase distribution. It is shown that the energy of differential rotation contained in peculiar stellar motions can aid in producing a spiral pattern under certain conditions.