Massless boundary sine-Gordon model coupled to external fields

Hisashi Kogetsu, Shunsuke Teraguchi

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


We investigate a generalization of the massless boundary sine-Gordon model with conformal invariance, which has been used to describe an array of D-branes (or rolling tachyon). We consider a similar action whose couplings are replaced with external fields depending on the boundary coordinate. Even in the presence of the external fields, this model is still solvable, though it does not maintain the whole conformal symmetry. We obtain, to all orders in perturbation theory in terms of the external fields, a simpler expression of the boundary state and the disc partition function. As a by-product, we fix the relation between the bare couplings and the renormalized couplings which has been appeared in papers on tachyon lump and rolling tachyon.

Original languageEnglish
Pages (from-to)1105-1116
Number of pages12
JournalJournal of High Energy Physics
Issue number1
Publication statusPublished - 2005 Jan
Externally publishedYes


  • Conformal Field Models in String Theory
  • Field Theories in Lower Dimensions
  • Integrable Field Theories
  • Tachyon Condensation

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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