Spin waves in a spin-1 normal Bose gas

摘要: We present a theory of spin waves in noncondensed gas spin-1 bosons and provide both analytic calculations the linear full numerical simulations nonlinear response. highlight role spin-dependent contact interactions dynamics thermal gas. Although these are small compared to energy, they set scale for low-energy, long-wavelength waves. In particular, we find that polar state {sup 87}Rb is unstable collisional mixing magnetic sublevels even normal state. augment our by providing trapped gas, explicitly demonstrating this instability. Further, show strong antiferromagnetic interactions, unstable. Finally, explore coherent population collisionless transversely polarized