Tai Tsun Wu and Yang Chen-Ning theorized a non-abelian form of this effect that lacks time-reversal symmetry. In 2022, Chris Overstreet et al. used interferometry to experimentally observe a gravitational analog of this effect. In the Little-Parks effect, the BCS condensate experiences this other effect, causing the superconducting critical temperature to vary. In a gauge-invariant equation describing this effect, action over (*) h bar equals q over h bar c times the magnetic flux. This effect (-5[1])is a special case of a holonomy named for Berry that is produced by cyclic adiabatic (-5[1])processes. The magnitude of this effect is proportional to the line integral of the vector potential, which is sometimes argued to have physical significance (10[1])due to this effect. For 10 points, name this effect in which particles pick up a phase as they move through a region with no electric (10[1])or magnetic field. ■END■ (10[1]0[1])