A non-propulsive warp field created by Wesley Crusher from Kosinski's equations, which accidentally encloses his mother in a shrinking private universe shaped by her own thoughts.
The static warp bubble appears in the Next Generation episode Remember Me. Wesley is running an experiment in engineering, trying to form a stable warp field without moving the ship, when a flash occurs while his mother is watching. Nothing seems to have happened.
Beverly Crusher then finds people vanishing from the ship, beginning with her visiting mentor Dalen Quaice, while everyone remaining insists they never existed. In the end she is alone, and the universe itself is a sphere a few hundred metres across.
She is inside the bubble, in a reality formed around what she was thinking when it closed. On the real Enterprise, Wesley and the Traveler open a gateway from Starbase 133, and she works out the truth in time to leap through before the bubble collapses.