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The evolution of spherically symmetric unstable scalar field configurations ("bubbles") is examined for both symmetric and asymmetric double-well potentials. Bubbles with initial static energies E₀E₂ₑ₈ₓ, where E₂ₑ₈ₓ is some critical value, shrink in a time scale determined by their linear dimension or "radius. " Bubbles with E₀E₂ₑ₈ₓ evolve into time-dependent, localized configurations which are very long-lived compared to characteristic time scales in the models examined. The stability of these configurations is investigated and possible applications are briefly discussed.
Marcelo Gleiser (Tue,) studied this question.