Results 1  10
of
29
Boundary CFT Construction of Dbranes in Vacuum String Field Theory
, 2001
"... In previous papers we built (multiple) Dbranes in flat spacetime as classical solutions of the string field theory based on the tachyon vacuum. In this paper we construct classical solutions describing all Dbranes in any fixed spacetime background defined by a two dimensional CFT of central char ..."
Abstract

Cited by 81 (6 self)
 Add to MetaCart
In previous papers we built (multiple) Dbranes in flat spacetime as classical solutions of the string field theory based on the tachyon vacuum. In this paper we construct classical solutions describing all Dbranes in any fixed spacetime background defined by a two dimensional CFT of central charge 26. A key role is played by the geometrical definition of the sliver state in general boundary CFT’s. The correct values for ratios of Dbrane tensions arise because the norm of the sliver solution is naturally related to the disk partition function of the appropriate boundary CFT. We also explore the possibility of reproducing the known spectrum of physical states on a Dbrane as deformations of the sliver.
Dbranes, tachyons, and string field theory
, 2003
"... In these notes we provide a pedagogical introduction to the subject of tachyon condensation in Witten’s cubic bosonic open string field theory. We use both the lowenergy YangMills description and the language of string field theory to explain the problem of tachyon condensation on unstable Dbra ..."
Abstract

Cited by 76 (4 self)
 Add to MetaCart
In these notes we provide a pedagogical introduction to the subject of tachyon condensation in Witten’s cubic bosonic open string field theory. We use both the lowenergy YangMills description and the language of string field theory to explain the problem of tachyon condensation on unstable Dbranes. We give a selfcontained introduction to open string field theory using both conformal field theory and overlap integrals. Our main subjects are the Sen conjectures on tachyon condensation in open string field theory and the evidence that supports these conjectures. We conclude with a discussion of vacuum string field theory and projectors of the staralgebra of open string fields. We comment on the possible role of string field theory in the construction of a nonperturbative formulation of string theory that captures all possible string backgrounds.
The identity string field and the tachyon vacuum
 JHEP
, 2001
"... Preprint typeset in JHEP style. HYPER VERSION ..."
Braneantibrane systems at finite temperature and the entropy of black branes, JHEP 0109
, 2001
"... We consider Dbrane–antiDbrane systems at T> 0. Starting at the closed string vacuum, we argue that a finite temperature leads to the reappearance of open string degrees of freedom. We also show that, at a sufficiently large temperature, the open string vacuum becomes stable. Building upon this ..."
Abstract

Cited by 33 (3 self)
 Add to MetaCart
(Show Context)
We consider Dbrane–antiDbrane systems at T> 0. Starting at the closed string vacuum, we argue that a finite temperature leads to the reappearance of open string degrees of freedom. We also show that, at a sufficiently large temperature, the open string vacuum becomes stable. Building upon this observation and previous work by Horowitz, Maldacena and Strominger, we formulate a microscopic braneantibrane model for the nonextremal black threebrane in ten dimensions (as well as for the black two and fivebranes in eleven dimensions). Under reasonable assumptions, and using known results from the AdS/CFT correspondence, the microscopic entropy agrees with the supergravity result up to a factor of 2 p p+1, with p the dimension of the brane. The negative specific heat and pressure of the black brane have a simple interpretation in terms of braneantibrane annihilation. We also find in the model states resembling black holes and other lowerdimensional black branes.
Mode Interactions of the Tachyon Condensate in padic String Theory,” hepth/0102071
"... We study the fluctuation modes for lump solutions of the tachyon effective potential in padic open string theory. We find a discrete spectrum with equally spaced mass squared levels. We also find that the interactions derived from this field theory are consistent with padic string amplitudes for e ..."
Abstract

Cited by 21 (1 self)
 Add to MetaCart
(Show Context)
We study the fluctuation modes for lump solutions of the tachyon effective potential in padic open string theory. We find a discrete spectrum with equally spaced mass squared levels. We also find that the interactions derived from this field theory are consistent with padic string amplitudes for excited string states. 1
Closed strings from nothing
, 2000
"... We study the physics of open strings in bosonic and type II string theories in the presence of unstable Dbranes. When the potential energy of the open string tachyon is at its minimum, Sen has argued that only closed strings remain in the perturbative spectrum. We explore the scenario of Yi and of ..."
Abstract

Cited by 11 (1 self)
 Add to MetaCart
We study the physics of open strings in bosonic and type II string theories in the presence of unstable Dbranes. When the potential energy of the open string tachyon is at its minimum, Sen has argued that only closed strings remain in the perturbative spectrum. We explore the scenario of Yi and of Bergman, Hori and Yi, who argue that the open string degrees of freedom are strongly coupled and disappear through confinement. We discuss arguments using open string field theory and worldsheet boundary RG flows, which seem to indicate otherwise. We then describe a solitonic excitation of the open string tachyon and gauge field with the charge and tension of a fundamental closed string. This requires a double scaling limit where the tachyon is taken to its minimal value and the electric field is taken to its maximum value. The resulting flux tube has an unconstrained spatial profile; and for large fundamental string charge, it appears to have light, weakly coupled open strings living in the core. We argue that the flux tube acquires a size or order α ′ through sigma model and string coupling effects; and we argue that confinement effects make the light degrees of freedom heavy and strongly interacting.
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 ..."
Abstract

Cited by 11 (0 self)
 Add to MetaCart
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.
Tachyon condensation and universality of DBI action
, 2000
"... We show that a lowenergy action for massless fluctuations around a tachyonic soliton background representing a codimension one Dbrane coincides with the DiracBornInfeld action. The scalar modes which describe transverse oscillations of the Dbrane are translational collective coordinates of the ..."
Abstract

Cited by 10 (2 self)
 Add to MetaCart
We show that a lowenergy action for massless fluctuations around a tachyonic soliton background representing a codimension one Dbrane coincides with the DiracBornInfeld action. The scalar modes which describe transverse oscillations of the Dbrane are translational collective coordinates of the soliton. The appearance of the DBI action is a universal feature independent of details of a tachyon effective action, provided it has the structure implied by the open string sigma model partition function.
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 ..."
Abstract

Cited by 10 (0 self)
 Add to MetaCart
(Show Context)
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 nonabelian structures in field theory of open strings
 JHEP 0106, 066 (2001) hepth/0105245, E. Akhmedov, “Nonabelian structures in BSFT and RR couplings,” hepth/0110002
"... Multibrane backgrounds are studied in the framework of the background independent open string field theory. A simple description of the nonabelian degrees of freedom is given. Algebra of the differential operators acting on the space of functions on the spacetime provides a natural tool for the d ..."
Abstract

Cited by 9 (0 self)
 Add to MetaCart
(Show Context)
Multibrane backgrounds are studied in the framework of the background independent open string field theory. A simple description of the nonabelian degrees of freedom is given. Algebra of the differential operators acting on the space of functions on the spacetime provides a natural tool for the discussion of this phenomena.