In this review we describe our current understanding of the properties of open string
tachyons on an unstable D-brane or brane–antibrane system in string theory. The various …

As of today, there exist consistent, gauge-invariant string field theories describing all string
theories: bosonic open and closed strings, open superstrings, heterotic strings, and type II …

We propose a new basis in Witten's open string field theory, in which the star product
simplifies considerably. For a convenient choice of gauge, the classical string field equation …

A bstract The determination of the string vertices of closed string field theory is shown to be a
conformal field theory problem solvable by combining insights from Liouville theory …

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 low-energy Yang-Mills …

We complete the construction of vacuum string field theory by proposing a canonical choice
of ghost kinetic term--a local insertion of the ghost field at the string midpoint with an infinite …

Schnabl recently constructed an analytic solution for tachyon condensation in Witten's open
string field theory. The solution consists of two pieces. Only the first piece is involved in …

Using analytical methods, a nonperturbative vacuum is constructed recursively in the field
theory for the open bosonic string. Evidence suggests it corresponds to the Lorentz-invariant …

String vertices of open-closed string field theory on an arbitrary closed string background
with N identical D-branes are investigated when N is large. We identify the relevant …

After introducingthe open string fieldtheory both for bosonic string and for su-perstring, we
use them to examine the conjecture that the unstable configurations ofthe D-branes will …