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Bipolaron energies are calculated as a function of wave vector by avariational method of Gurari appropriate for weak or intermediate couplingstrengths, for a model with electron-phonon interactions independent of phononwave vectors and a short-ranged Coulomb repulsion. It is assumed that the bareelectrons have a constant effective mass. A two-parameter trial function istaken for the relative motion of the two electrons in the bipolaron. Energiesof bipolarons are compared with those of two single polarons as a function ofwave vector for various parameter values. Results for effective masses at thezone center are also obtained. Comparison is made with data of other authorsfor bipolarons in the Hubbard-Holstein model, which differs mainly from thepresent model in that it has a tight-binding band structure for the bareelectrons.Comment: 11 pages including six figures. Physical Review B, to be publishe

Polaron and bipolaron dispersion curves in one dimension for intermediate coupling