Closed Strings as Imaginary D-branes

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dc.creatorGaiotto, Davide
dc.creatorItzhaki, Nissan
dc.creatorRastelli, Leonardo
dc.date2003-04-23
dc.date2004-01-26
dc.date.accessioned2026-07-07T10:49:37Z
dc.date.available2026-07-07T10:49:37Z
dc.descriptionSen has recently drawn attention to an exact time-dependent Boundary Conformal Field Theory with the space-time interpretation of brane creation and annihilation. An interesting limit of this BCFT is formally equivalent to an array of D-branes located in imaginary time. This raises the question: what is the meaning of D-branes in imaginary time? The answer we propose is that D-branes in imaginary time define purely closed string backgrounds. In particular we prove that the disk scattering amplitude of m closed strings off an arbitrary configuration of imaginary branes is equivalent to a sphere amplitude with m+1 closed string insertions. The extra puncture is a specific closed string state, generically normalizable, that depends on the details of the brane configuration. We study in some detail the special case of the array of imaginary D-branes related to Sen's BCFT and comment on its space-time interpretation. We point out that a certain limit of our set-up allows to study classical black hole creation and suggests a relation between Choptuik's critical behavior and a phase-transition a` la Gregory-Laflamme. We speculate that open string field theory on imaginary D-branes is dual to string theory on the corresponding closed string background.
dc.description40 pages, 4 eps figures. Minor typos fixed
dc.identifierhttps://arxiv.org/abs/hep-th/0304192
dc.identifierhttp://arxiv.org/abs/hep-th/0304192
dc.identifierNucl.Phys.B688:70-100,2004
dc.identifierdoi:10.1016/j.nuclphysb.2004.03.017
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/184280
dc.subjectHigh Energy Physics - Theory
dc.titleClosed Strings as Imaginary D-branes
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