= Finite-energy field configuration
{title2=$E[\Phi]<\infty$}
A <finite-energy field configuration> has integrable <energy density> after the vacuum <energy> has been subtracted. The <boundary conditions> used for a localized <classical field-theory soliton> require approaching a vacuum at spatial infinity. In one dimension the two ends may approach distinct <scalar-field vacua>; in a gauge theory the asymptotic field can have nontrivial winding even when its local <energy> density tends to zero.
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