COSMOLOGICAL SCENARIO FOR A-B PHASE-TRANSITION IN SUPERFLUID HE-3

During a very rapid superfluid transition in He-3 following a reaction with a single neutron, the creation of topological defects (vortices) has been recently demonstrated to be in accordance with the Kibble-Zu rek scenario for the cosmological analog. We discuss here the extensio n of the Kibble-Zurek scenario to the case when alternative symmetries may be broken and different states nucleated independently. We have c alculated the nucleation probability of the various states of superflu id He-3 during a superfluid transition. Our results can explain the tr ansition from the supercooled A phase to the B phase triggered by a nu clear reaction. The new scenario is an alternative to the well-known ' 'baked Alaska'' scenario.