Oscillons in the broken vacuum and global vortex annihilation
Abstract
In contrast to the complex φ4 model, vortex-antivortex collisions in the complex φ6 theory reveal a resonant structure due to the existence of a remarkably stable, long-lived, large amplitude oscillon in the broken vacuum. Surprisingly, it persists despite the absence of a mass gap associated with the flat direction in the broken vacuum. We demonstrate that its existence is related to a far-distance modification of the potential, namely, the appearance of an unbroken (false or true) vacuum.
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