D-brane decay in two-dimensional string theory

Igor R. Klebanov, Juan Maldacena, Nathan Seiberg

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175 Scopus citations


We consider unstable DO-branes of two dimensional string theory, described by the boundary state of Zamolodchikov and Zamolodchikov [36] multiplied by the Neumann boundary state for the time coordinate t. In the dual description in terms of the c = 1 matrix model, this DO-brane is described by a matrix eigenvalue on top of the upside down harmonic oscillator potential. As suggested by McGreevy and Verlinde [25], an eigenvalue rolling down the potential describes D-brane decay. As the eigenvalue moves down the potential to the asymptotic region it can be described as a free relativistic fermion. Bosonizing this fermion we get a description of the state in terms of a coherent state of the tachyon field in the asymptotic region, up to a non-local linear field redefinition by an energy-dependent phase. This coherent state agrees with the exponential of the closed string one-point function on a disk with Sen's marginal boundary interaction for t which describes DO-brane decay.

Original languageEnglish (US)
Pages (from-to)1053-1069
Number of pages17
JournalJournal of High Energy Physics
Issue number7
StatePublished - Jul 1 2003

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


  • Bosonic Strings
  • D-branes
  • Tachyon Condensation


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