American Physical Society, Physical Review D, 8(85), 2012
DOI: 10.1103/physrevd.85.085005
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Multi-soliton form factors in sine-Gordon theory from the bootstrap are compared to finite volume matrix elements computed using the truncated conformal space approach. We find convincing agreement, and resolve most of the issues raised in a previous work. ; Comment: 24 pages, LaTeX2e file, 8 eps figures. v2: notations improved, some explanatory text and references added