153 citations · 588 across the 12 of their papers we have counts for
12 papers · 1 filter
Singular gauge transformations in string field theory
Ian Ellwood
We show that the existence of a tachyon vacuum puts tight restrictions on the form of solutions to the equations of motion of string field theory. In particular, we demonstrate tha…
The closed string tadpole in open string field theory
Ian Ellwood
We compute a class of gauge invariant observables for marginal solutions and the tachyon vacuum. In each case we find that the observables are related in a simple way to the closed…
Rolling to the tachyon vacuum in string field theory
Ian Ellwood
We argue that the rolling-tachyon solution in cubic OSFT proceeds at late times to precisely the analytic tachyon-vacuum solution constructed by Schnabl. In addition, we demonstrat…
NS-NS fluxes in Hitchin's generalized geometry
Ian Ellwood
The standard notion of NS-NS 3-form flux is lifted to Hitchin's generalized geometry. This generalized flux is given in terms of an integral of a modified Nijenhuis operator over a…
Effective descriptions of branes on non-geometric tori
Ian Ellwood, Akikazu Hashimoto
We investigate the low-energy effective description of non-geometric compactifications constructed by T-dualizing two or three of the directions of a T^3 with non-vanishing H-flux.…
Proof of vanishing cohomology at the tachyon vacuum
Ian Ellwood, Martin Schnabl
We prove Sen's third conjecture that there are no on-shell perturbative excitations of the tachyon vacuum in open bosonic string field theory. The proof relies on the existence of…
Open/closed duality for FZZT branes in c=1
Ian Ellwood, Akikazu Hashimoto
We describe how the matrix integral of Imbimbo and Mukhi arises from a limit of the FZZT partition function in the double-scaled c=1 matrix model. We show a similar result for 0A a…
Relating branes and matrices
Ian Ellwood
We construct a general map between a Dp-brane with magnetic flux and a matrix configuration of D0-branes, by showing how one can rewrite the boundary state of the Dp-brane in terms…
Tadpoles and Closed String Backgrounds in Open String Field Theory
Ian Ellwood, Jessie Shelton, Washington Taylor
We investigate the quantum structure of Witten's cubic open bosonic string field theory by computing the one-loop contribution to the open string tadpole using both oscillator and…
The Identity String Field and the Tachyon Vacuum
Ian Ellwood, Bo Feng, Yang-Hui He +1
We show that the triviality of the entire cohomology of the new BRST operator Q around the tachyon vacuum is equivalent to the Q-exactness of the identity I of the star-algebra. We…
Gauge Invariance and Tachyon Condensation in Open String Field Theory
Ian Ellwood, Washington Taylor
The gauge invariance of open string field theory is considered from the point of view of level truncation, and applications to the tachyon condensation problem are discussed. We sh…
Open string field theory without open strings
Ian Ellwood, Washington Taylor
Witten's cubic open string field theory is expanded around the perturbatively stable vacuum, including all scalar fields at levels 0, 2, 4 and 6. The (approximate) BRST cohomology…