Finite volume form factors in the presence of integrable defects

Z. Bajnok, F. Buccheri, L. Hollo, J. Konczer, G. Takacs

Research output: Contribution to journalArticle

5 Citations (Scopus)


We developed the theory of finite volume form factors in the presence of integrable defects. These finite volume form factors are expressed in terms of the infinite volume form factors and the finite volume density of states and incorporate all polynomial corrections in the inverse of the volume. We tested our results, in the defect Lee-Yang model, against numerical data obtained by truncated conformal space approach (TCSA), which we improved by renormalization group methods adopted to the defect case. To perform these checks we determined the infinite volume defect form factors in the Lee-Yang model exactly, including their vacuum expectation values. We used these data to calculate the two point functions, which we compared, at short distance, to defect CFT. We also derived explicit expressions for the exact finite volume one point functions, which we checked numerically. In all of these comparisons excellent agreement was found.

Original languageEnglish
Pages (from-to)501-531
Number of pages31
JournalNuclear Physics B
Issue number1
Publication statusPublished - May 2014

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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