CONSERVATION-LAWS AND BOSONIZATION IN INTEGRABLE LUTTINGER LIQUIDS

We examine and explain the Luttinger-liquid character of models solvab le by the Bethe ansatz by introducing a suitable bosonic operator alge bra. In the case of the Hubbard chain, this involves two bosonic algeb ras which apply to all values of U, electronic density, and magnetizat ion. Only at zero magnetization does this lead to the usual charge-spi n separation. We show that our ''pseudoparticle'' operator approach cl arifies, unifies, and extends several recent results, including the ex istence of independent right and left equations of motion and the conc ept of ''pseudoparticle'' (also known as ''Bethe quasiparticle'').