(1) ITP, SUNY at Stony Brook, NY 11794-3840, USA, US;(2) Steklov Mathematical Institute, Gubkina 8, Moscow 117966, Russia, RU
Abstract:
We discovered a simple quadratic equation, which relates scattering phases of particles on Fermi surface. We consider one-dimensional Bose gas and XXZ Heisenberg quantum spin chain. Received: 4 December 1997 / Accepted: 17 March 1998