title: Dynamics of excitations in a one-dimensional bose liquid.
abstract: We show that the dynamic structure factor of a one-dimensional Bose liquid has a power-law singularity defining the main mode of collective excitations. Using the Lieb-Liniger model, we evaluate the corresponding exponent as a function of the wave vector and the interaction strength.
authors.affiliation: William I. Fine Theoretical Physics Institute and School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.
authors.forename: M
authors.initials: M
authors.lastname: Khodas
authors.forename: M
authors.initials: M
authors.lastname: Pustilnik
authors.forename: A
authors.initials: A
authors.lastname: Kamenev
authors.forename: L I
authors.initials: LI
authors.lastname: Glazman