A team at Heidelberg University demonstrated that when two of these substances are weakly coupled, they exhibit Josephson junction-like dynamics and macroscopic self-trapping. In these substances, the width of matter wave dark solitons (“SAHL-ih-tanz”) and other nonlinear excitations is constrained by the healing length. (10[2])Interactions within these substances (10[1])are described by the s-wave scattering length in the standard nonlinear equation used to model these substances’ behavior in cigar-shaped traps. In these substances, as chemical potential reaches its upper bound, the excited state occupation number becomes constant while the ground state occupation number goes (10[1])to infinity. (10[3])These substances (10[1])were first (-5[1])created with ultracold (-5[2])gases (10[1])of sodium (10[1])and rubidium atoms. (10[4]-5[1])For 10 (10[1])points, what substances (10[1])form at low temperatures (10[2])when the ground state is occupied by a large fraction of bosons? (10[1]0[1])■END■ (10[3]0[1])