Movement of bubble universe thought experiment

The scientists propose a new model with dark energy and our universe riding on an expanding bubble in an extra dimension. The whole universe accommodated on the edge of the this expanding bubble. The thought experiment in this paper involves a bubble universe that is assumed to be rising in direction of North bubble pole. The rising is based on assumption with its comparison with parcel of air observed in meteorology. The thought experiment in this paper involves a bubble universe that is assumed to be rising in direction of its north bubble pole. Her universe is also imagined moving in a direction like a parcel of air but on the base of pressure mismatch but this thought experiment involves imagining the bubble rising that would be its movement along the direction of it north bubble pole. If these bubbles are assumed to be moving upward like parcel of air as this thought experiment involves the assumption of them moving upward i.e. moving in direction of their respective north bubble pole could have collisions. The possible assumption of poles of bubbles assumes that their movements, expanding and cooling of the universe are all correlated.