“…Many authors have studied energies of large 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15 and small 16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37 38,39,40,41,42,43 bipolarons in various numbers of dimensions, and some have made calculations of bipolaron effective masses at the band minimum. 6,9,10,18,29,33,35,36,37 However, we are not aware of published calculations of bipolaron energies as a function of wave vector which extend to large wave vectors except in the case of small bipolarons when the electron-phonon coupling is strong.…”