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56
String Field Theory Around the Tachyon Vacuum
, 2000
"... Assuming that around the tachyon vacuum the kinetic term of cubic open string field theory is made purely of ghost operators we are led to gauge invariant actions which manifestly implement the absence of open string dynamics around this vacuum. We test this proposal by showing the existence of lump ..."
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Cited by 154 (6 self)
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Assuming that around the tachyon vacuum the kinetic term of cubic open string field theory is made purely of ghost operators we are led to gauge invariant actions which manifestly implement the absence of open string dynamics around this vacuum. We test this proposal by showing the existence of lump solutions of arbitrary codimension in this string field theory. The key ingredients in this analysis are certain assumptions about the analyticity properties of tachyon Green’s functions. With the help of some further assumptions about the properties of these Green’s functions, we also calculate the ratios of tensions of lump solutions of different dimensions. The result is in perfect agreement with the known answers for the ratios of tensions of Dbranes of different dimensions.
A Review on Tachyon Condensation in Open String Field Theories
"... We review the recent studies of tachyon condensation in string field theory. After introducing the open string field theory both for bosonic string and for superstring, we use them to examine the conjecture that the unstable configurations of the Dbrane will decay into the ‘closed string vacuum ’ t ..."
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Cited by 141 (4 self)
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We review the recent studies of tachyon condensation in string field theory. After introducing the open string field theory both for bosonic string and for superstring, we use them to examine the conjecture that the unstable configurations of the Dbrane will decay into the ‘closed string vacuum ’ through the tachyon condensation. And we describe the attemps to construct a lower dimensional bosonic Dbrane as an unstable lump solution of the string field equation. We obtain exact results from another formulation, background independent open string field theory. We also discuss some other topics which are related to tachyon condensation in string theory, such as the construction of a Dbrane as a noncommutative soliton
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 ..."
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Cited by 33 (3 self)
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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.
Stringy Higgs mechanism and the fate of open strings
 JHEP
, 2001
"... We propose a refinement of the physical picture describing different vacua in bosonic string theory. The vacua with closed strings and open strings are connected by the string field theory version of the Higgs mechanism, generalizing the Higgs mechanism of an abelian gauge field interacting with a c ..."
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Cited by 29 (2 self)
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We propose a refinement of the physical picture describing different vacua in bosonic string theory. The vacua with closed strings and open strings are connected by the string field theory version of the Higgs mechanism, generalizing the Higgs mechanism of an abelian gauge field interacting with a complex scalar. In accordance with Sen’s conjecture, the condensation of the tachyon is an essential part of the story. We consider this phenomenon from the point of view of both a worldsheet sigmamodel and the targetspace theory. In the Appendix the relevant remarks regarding the choice of the coordinates in the background independent open string field theory are given.
Cosmological evolution of the rolling tachyon
 Phys. Lett
"... The cosmological effects of the tachyon rolling down to its ground state are discussed by coupling a simple effective field theory for the tachyon field to Einstein gravity. As the tachyon the rolls down to the minimum of its potential the universe expands. Depending upon initial conditions, the sca ..."
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Cited by 28 (1 self)
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The cosmological effects of the tachyon rolling down to its ground state are discussed by coupling a simple effective field theory for the tachyon field to Einstein gravity. As the tachyon the rolls down to the minimum of its potential the universe expands. Depending upon initial conditions, the scale factor may or may not start of accelerating, but ultimately it ceases to do so and the final flat spacetime is either static in the rest frame of the tachyon (if k = 0) or ( if k = −1) given by the Milne model. 1 1
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 ..."
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Cited by 21 (1 self)
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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
Tachyon Condensation and Background Indepedent Superstring Field Theory
"... We study quantum corrections at the one loop level in open superstring tachyon condensation using the boundary string field theory (BSFT) method. We find that the tachyon field action has the same form as at the disc level, but with a renormalized effective coupling λ ′ = gren s e−T2 /4 ren (gs is ..."
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Cited by 18 (3 self)
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We study quantum corrections at the one loop level in open superstring tachyon condensation using the boundary string field theory (BSFT) method. We find that the tachyon field action has the same form as at the disc level, but with a renormalized effective coupling λ ′ = gren s e−T2 /4 ren (gs is the renormalized dimensionless closed string coupling, e−T2 /4 is the tachyonic field expectation value) and with an effective string tension. This result is in agreement with that based on general analysis of loop effects.
BoseEinstein Condensation
, 1995
"... Dispersive propagation of ultraslow light in an atomic ..."
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Cited by 15 (0 self)
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Dispersive propagation of ultraslow light in an atomic
Closed string emission from unstable Dbrane with background electric field
 JHEP
, 2004
"... We study the closed string emission from an unstable Dpbrane with constant background electric field in bosonic string theory. The average total number density and the average total energy density of emitted closed strings are explicitly calculated in the presence of electric field. It is explicitl ..."
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Cited by 12 (0 self)
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We study the closed string emission from an unstable Dpbrane with constant background electric field in bosonic string theory. The average total number density and the average total energy density of emitted closed strings are explicitly calculated in the presence of electric field. It is explicitly shown that the energy density in the UV region becomes finite whenever the background electric field is switched on. The energy density converted into closed strings in the presence of electric field is negligibly small compared with the Dbrane tension in the weak Tachyon condensation has been an issue in string theory [1, 2]. The decay process of an unstable Dbrane can be described by tachyon condensation in the world volume effective field theory. It is observed that the decay leaves such objects called tachyon matter behind that they have the same energy density as the tension of the initial
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 ..."
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Cited by 11 (1 self)
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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.