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String Field Theory Around the Tachyon Vacuum
Leonardo Rastelli, Ashoke Sen, Barton Zwiebach
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…
Gauge Fields and Fermions in Tachyon Effective Field Theories
Joseph A. Minahan, Barton Zwiebach
In this paper we incorporate gauge fields into the tachyon field theory models for unstable D-branes in bosonic and in Type II string theories. The chosen couplings yield massless…
Trimming the Tachyon String Field with SU(1,1)
Barton Zwiebach
A discrete symmetry of the string field tachyon condensate noted by Hata and Shinohara is identified as a discrete subgroup of an SU(1,1) symmetry acting on the ghost coordinates.…
Effective Tachyon Dynamics in Superstring Theory
Joseph A. Minahan, Barton Zwiebach
A recently proposed \ell=\infty field theory model of tachyon dynamics for unstable bosonic D-branes has been shown to arise as the two-derivative truncation of (boundary)-string f…
Field theory models for tachyon and gauge field string dynamics
Joseph A. Minahan, Barton Zwiebach
In hep-th/0008227, the unstable lump solution of ϕ^3 theory was shown to have a spectrum governed by the solvable Schroedinger equation with the \ell=3 reflectionless potential and…
A Solvable Toy Model for Tachyon Condensation in String Field Theory
Barton Zwiebach
The lump solution of ϕ^3 field theory provides a toy model for unstable D-branes of bosonic string theory. The field theory living on this lump is itself a cubic field theory invol…
Large Marginal Deformations in String Field Theory
Ashoke Sen, Barton Zwiebach
We use the level truncation scheme to obtain accurate descriptions of open bosonic string field configurations corresponding to large marginal deformations such as background Wilso…
Tachyon potentials, star products and universality
Leonardo Rastelli, Barton Zwiebach
We develop an efficient recursive method to evaluate the tachyon potential using the relevant universal subalgebra of the open string star algebra. This method, using off-shell ver…
D-branes as Tachyon Lumps in String Field Theory
Nicolas Moeller, Ashoke Sen, Barton Zwiebach
It has been conjectured that the tachyonic lump solution of the open bosonic string field theory describing a D-brane represents a D-brane of one lower dimension. We place the lump…
Tachyon Condensation in Superstring Field Theory
Nathan Berkovits, Ashoke Sen, Barton Zwiebach
It has been conjectured that at the stationary point of the tachyon potential for the D-brane-anti-D-brane pair or for the non-BPS D-brane of superstring theories, the negative ene…
Duality and Weyl Symmetry of 7-brane Configurations
Tamas Hauer, Amer Iqbal, Barton Zwiebach
Extending earlier results on the duality symmetries of three-brane probe theories we define the duality subgroup of SL(2,Z) as the symmetry group of the background 7-branes configu…