Stability of a class of neutral vacuum bubbles
  A model that gives rise to vacuum bubbles is considered where the domain wall
field interacts with another real scalar field, resulting in the formation of
domain ribbons within the host domain wall. Ribbon-antiribbon annihilations
produce elementary bosons whose mass inside the wall is different from the mass
in vacuum. Two cases are considered, where the bosons get trapped either within
the bubble wall or the bosons get trapped within the vacuum enclosed by the
bubble. The bosonic (meta)stabilization effect on the bubble is examined in
each case. It is found that when the bosons become trapped within the bubble
wall, the stabilization mechanism lasts for only a limited amount of time, and
then the bubble undergoes unchecked collapse. However, when the bosons become
trapped within the bubble's interior volume, the bubble can be long-lived,
provided that it has a sufficiently thin wall.
