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We study the motion of domain walls in 1+1, 2+1 and briefly 3+1 d relativistic ϕ6 model with three equal vacua in the presence of radiation. We show that even small fluctuations can trigger a chain reaction leading to vanishing of the domain walls. Only one vacuum remains stable and domains containing other vacua vanish. We explain this phenomenon in terms of radiation pressure (both positive and...
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