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Oneloop Correction of the Tachyon Action in Boundary Superstring Field Theory
"... We compute oneloop correction to the string field theory action of the tachyon for unstable Dbranes in the framework of the boundary superstring field theory. We would expect that the oneloop correction comes from the partition function of the twodimensional worldsheet theory on the annulus. Al ..."
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We compute oneloop correction to the string field theory action of the tachyon for unstable Dbranes in the framework of the boundary superstring field theory. We would expect that the oneloop correction comes from the partition function of the twodimensional worldsheet theory on the annulus. Although in this level, the general shape of the tachyon potential does not change, the tachyon zero mode dependence is quite complicated. In particular, the genus expansion is not governed by the effective string coupling which is The open string tachyon condensation on nonBPS brane systems has attracted much interest recently. One framework of analysis is level truncation of the open string field theory (SFT) which lead to very good numerical agreements with expected values of vacuum energy and lowerdimensional Dbranes tensions [1, 2].
Boundary superstring field theory annulus partition function in the presence of tachyons
, 2001
"... We compute the Boundary Superstring Field Theory partition function on the annulus in the presence of independent linear tachyon profiles on the two boundaries. The RR sector is found to contribute nontrivially to the derivative terms of the spacetime effective action. In the process we construct ..."
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We compute the Boundary Superstring Field Theory partition function on the annulus in the presence of independent linear tachyon profiles on the two boundaries. The RR sector is found to contribute nontrivially to the derivative terms of the spacetime effective action. In the process we construct a boundary state description of Dbranes in the presence of a linear tachyon. We quantize the open string in a tachyonic background and address the question of open/closed string duality.
Quantum corrections in padic string theory,” arXiv:hepth/0105312
 19 M. Gutperle and A. Strominger, “Spacelike branes,” JHEP
, 2002
"... We compute loop corrections in padic open string field theory. We argue that quantum effects induce a pole with m 2 ∼ − ln g for the open string field at the locally stable vacuum. We also compute the one loop effective potential and show that the potential develops an imaginary piece when the fie ..."
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We compute loop corrections in padic open string field theory. We argue that quantum effects induce a pole with m 2 ∼ − ln g for the open string field at the locally stable vacuum. We also compute the one loop effective potential and show that the potential develops an imaginary piece when the field becomes tachyonic. 1
On a Modification of the Boundary State Formalism in Offshell String Theory”, hepth/0106033
"... We examine the application of boundary states in computing amplitudes in offshell open string theory. We find a straightforward generalization of boundary state which produces the correct matrix elements with onshell closed string states. 2 1.Background independent string field theory [1][5] is an ..."
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We examine the application of boundary states in computing amplitudes in offshell open string theory. We find a straightforward generalization of boundary state which produces the correct matrix elements with onshell closed string states. 2 1.Background independent string field theory [1][5] is an interesting approach to the problem of defining string theory offshell. It has recently received a lot of attention, particularly as an approach to understanding the properties of unstable Dbranes [6, 7, 8]. A concrete problem in the study of offshell string theory in this formalism has been to understand its behavior in the a background tachyon field which is a quadratic function of the coordinates. This gives a tractable model where one can study phenomena such as tachyon condensation and DbraneantiDbrane annihilation [6][17]. In this context, the concept of boundary state, which describes the coupling of string worldsheets to a Dbrane has been used by several authors [18][22].
The boundary state formalism and conformal invariance in offshell string theory
 JHEP
"... In this note we present a generalization of the boundary state formalism for the bosonic string that allows us to calculate the overlap of the boundary state with arbitrary closed string states. We show that this generalization exactly reproduces worldsheet sigma model calculations, thus giving the ..."
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In this note we present a generalization of the boundary state formalism for the bosonic string that allows us to calculate the overlap of the boundary state with arbitrary closed string states. We show that this generalization exactly reproduces worldsheet sigma model calculations, thus giving the correct overlap with both onand offshell string states, and that this new boundary state automatically satisfies the requirement for integrated vertex operators in the case of nonconformally invariant boundary interactions 1 1
Unorientable Boundary Superstring Field Theory with Tachyon Field
, 2001
"... We use the BSFT method to study the unoriented open string theory. The partition function on the Möbius strip is calculated. We find that, at the oneloop level, the divergence coming from planar graph and unoriented graph cancel each other as expected. ..."
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We use the BSFT method to study the unoriented open string theory. The partition function on the Möbius strip is calculated. We find that, at the oneloop level, the divergence coming from planar graph and unoriented graph cancel each other as expected.
Boundary String Field Theory at Oneloop
, 2001
"... We apply the boundary string field theory (BSFT) to a unstable Dbrane system to study the openclosed string duality at one loop in the presence of the tachyon condensation. The partition function at oneloop level is calculated by using both open and closed string channels. We find that the result ..."
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We apply the boundary string field theory (BSFT) to a unstable Dbrane system to study the openclosed string duality at one loop in the presence of the tachyon condensation. The partition function at oneloop level is calculated by using both open and closed string channels. We find that the results from two different channels coincide, thus the openclosed string duality holds even offshell.
Nonorientable Boundary Superstring Field Theory with Tachyon Field
, 2001
"... We use the BSFT method to study the unoriented open string theory. The partition function on the Möbius strip is calculated. We find that, at the oneloop level, the divergence coming from planar graph and unoriented graph cancel each other as expected. ..."
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We use the BSFT method to study the unoriented open string theory. The partition function on the Möbius strip is calculated. We find that, at the oneloop level, the divergence coming from planar graph and unoriented graph cancel each other as expected.
hepth/0109187 HU BerlinEP01/32 On OneLoop Approximation to Tachyon Potentials
, 2001
"... We compute the oneloop corrections to the tachyon potentials in both, bosonic and supersymmetric, cases by worldsheet methods. In fact, there is no contradiction between this approach and the Feynman diagram expansions arising from the tree level effective actions. In the process, we also get some ..."
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We compute the oneloop corrections to the tachyon potentials in both, bosonic and supersymmetric, cases by worldsheet methods. In fact, there is no contradiction between this approach and the Feynman diagram expansions arising from the tree level effective actions. In the process, we also get some insight on tachyon condensation from the viewpoint of closed string modes and show that there is an instability due to the closed string tachyon in the bosonic case. PACS: 11.25.w Keywords: string theory, unstable Dbranes
UCLA/01/TEP/9 Loop Corrected Tachyon Condensation
, 2001
"... We study loop corrections in boundary string field theory (BSFT). After commenting on problems with quantizing the tree level BSFT as an ordinary field theory, we discuss the tree level coupling to closed strings and define the loop corrections via factorization in the closed string channel. This de ..."
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We study loop corrections in boundary string field theory (BSFT). After commenting on problems with quantizing the tree level BSFT as an ordinary field theory, we discuss the tree level coupling to closed strings and define the loop corrections via factorization in the closed string channel. This description is weakly coupled in the vicinity of the closed string vacuum. Our proposal for the oneloop effective action differs in general from computing the annulus or cylinder partition functions. We also compute the decay rates and the loop corrections to the tensions of unstable branes in perturbative string theory.