11 research outputs found
On open-closed extension of boundary string field theory
We investigate a classical open-closed string field theory whose open string
sector is given by boundary string field theory. The open-closed interaction is
introduced by the overlap of a boundary state with a closed string field. With
the help of the Batalin-Vilkovisky formalism, the closed string sector is
determined to be the HIKKO closed string field theory. We also discuss the
gauge invariance of this theory in both open and closed string sides.Comment: 25 pages, 2 figures, comments and a reference added, typos correcte
Some exact computations on the twisted butterfly state in string field theory
The twisted butterfly state solves the equation of motion of vacuum string
field theory in the singular limit. The finiteness of the energy density of the
solution is an important issue, but possible conformal anomaly resulting from
the twisting has prevented us from addressing this problem. We present a
description of the twisted regulated butterfly state in terms of a conformal
field theory with a vanishing central charge which consists of the ordinary bc
ghosts and a matter system with c=26. Various quantities relevant to vacuum
string field theory are computed exactly using this description. We find that
the energy density of the solution can be finite in the limit, but the
finiteness depends on the subleading structure of vacuum string field theory.
We further argue, contrary to our previous expectation, that contributions from
subleading terms in the kinetic term to the energy density can be of the same
order as the contribution from the leading term which consists of the midpoint
ghost insertion.Comment: 36 pages, no figures, LaTeX2e; v2: minor corrections; v3: typos
corrected, published in JHEP; v4: a minor typo in (C.12) correcte
The Weyl bundle as a differentiable manifold
Construction of an infinite dimensional differentiable manifold not modelled on any Banach space is proposed. Definition, metric
and differential structures of a Weyl algebra and a Weyl algebra bundle are
presented. Continuity of the -product in the Tichonov topology is
proved. Construction of the -product of the Fedosov type in terms of theory
of connection in a fibre bundle is explained.Comment: 31 pages; revised version - some typoes have been eliminated,
notation has been simplifie
Brane Decay and Death of Open Strings
We show how open strings cease to propagate when unstable D-branes decay. The
information on the propagation is encoded in BSFT two-point functions for
arbitrary profiles of open string excitations. We evaluate them in tachyon
condensation backgrounds corresponding to (i) static spatial tachyon kink (=
lower dimensional BPS D-brane) and (ii) homogeneous rolling tachyon. For (i)
the propagation is restricted to the directions along the tachyon kink, while
for (ii) all the open string excitations cease to propagate at late time and
are subject to a collapsed light cone characterized by Carrollian contraction
of Lorentz group.Comment: 19 pages, published version (typos corrected, a reference added
-SDYM Fields and Heavenly Spaces. I. -SDYM equations as an integrable system
It is shown that the self-dual Yang-Mills (SDYM) equations for the
-bracket Lie algebra on a heavenly space can be reduced to one equation
(the \it master equation\rm). Two hierarchies of conservation laws for this
equation are constructed. Then the twistor transform and a solution to the
Riemann-Hilbert problem are given.Comment: 25 page