19,679 research outputs found
Exact Results on Equations of Motion in Vacuum String Field Theory
We prove some algebraic relations on the translationally invariant solutions
and the lump solutions in vacuum string field theory. We show that up to the
subtlety at the midpoint the definition of the half-string projectors of the
known sliver solution can be generalized to other solutions. We also find that
we can embed the translationally invariant solution into the matrix equation of
motion with the zero mode.Comment: 12 pages, no figures, LaTeX2e, v2: references adde
Is the String Coupling Constant invariant under T-duality?
It is well known that under T-duality the sigma model dilaton (which is
normally thought to be related to the string coupling constant through the
simple formula ), undergoes an additive shift. On the
other hand, Kugo and Zwiebach, using a simplified form of string field theory,
claim that the string coupling constant does not change under the T-duality.
Obviously, what seems to happen is that two different coupling constants,
associated to different dilatons, are used. In this contribution we shall try
to clarify this, and related issues.Comment: LaTeX, 13 pag. Contributions to Santa Margherita and S. Petersburg
meeting
Gauge and General Coordinate Invariance in Non-Polynomial Closed String Field Theory
An appropriate field configuration in non-polynomial closed string field
theory is shown to correspond to a general off-shell field configuration in low
energy effective field theory. A set of string field theoretic symmetries that
act on the fields in low energy effective field theory as general coordinate
transformation and antisymmetric tensor gauge transformation is identified. The
analysis is carried out to first order in the fields; thus the symmetry
transformations in string field theory reproduce the linear and the first
non-linear terms in the gauge transformations in the low energy effective field
theory.Comment: 29 page
Gauge Structure of Vacuum String Field Theory
We study the gauge structure of vacuum string field theory expanded around
the D-brane solution, namely, the gauge transformation and the transversality
condition of the massless vector fluctuation mode. We find that the gauge
transformation on massless vector field is induced as an anomaly; an infinity
multiplied by an infinitesimal factor. The infinity comes from the singularity
at the edge of the eigenvalue distribution of the Neumann matrix, while the
infinitesimal factor from the violation of the equation of motion of the
fluctuation modes due to the regularization for the infinity. However, the
transversality condition cannot be obtained even if we take into account the
anomaly contribution.Comment: 19 pages, LaTeX2
BRST Invariance of the Non-Perturbative Vacuum in Bosonic Open String Field Theory
Tachyon condensation on a bosonic D-brane was recently demonstrated
numerically in Witten's open string field theory with level truncation
approximation. This non-perturbative vacuum, which is obtained by solving the
equation of motion, has to satisfy furthermore the requirement of BRST
invariance. This is indispensable in order for the theory around the
non-perturbative vacuum to be consistent. We carry out the numerical analysis
of the BRST invariance of the solution and find that it holds to a good
accuracy. We also mention the zero-norm property of the solution. The
observations in this paper are expected to give clues to the analytic
expression of the vacuum solution.Comment: 14 pages, no figures, LaTeX2e, v2: references added, minor changes,
v3: typos correcte
The Updated MSW Analysis and the Standard Solar Model Uncertainties
We update the analysis of the MSW and general astrophysical solutions to the
combined solar neutrino observations by including the GALLEX II result. We also
show that our parametrized flux uncertainties are equivalent to the Monte-Carlo
results of Bahcall and Ulrich.Comment: (Revtex 3.0, convertible to Latex, 10 pages + 6 uuencoded ps figures,
UPR-0581T
- …