The superfluidity of helium-4 is related to the formation of one of these substances.
In these systems, "dark" or "bright" solitons can form depending on whether the interaction is attractive or repulsive. For certain scattering processes in these substances, a bound state known as a Feshbach resonance can occur. The critical temperature for one of these substances to form is inversely proportional to the Riemann zeta function of three-halves to the two-thirds power. The superfluidity of helium-4 is related to the formation of one of these substances. The first step in creating these substances often involves placing atoms in a magneto-optical trap. The first example of these substances was observed by laser cooling a vapor of rubidium atoms. For 10 points, name this substance, a gas of integer-spin particles at a temperature near absolute zero.
In these systems, "dark" or "bright" solitons can form depending on whether the interaction is attractive or repulsive.
Bose–Einstein condensate [or BEC] &lt;Rombro&gt;