73 research outputs found
Vacuum String Field Theory ancestors of the GMS solitons
We define a sequence of VSFT D-branes whose low energy limit leads exactly to
a corresponding sequence of GMS solitons. The D-branes are defined by acting on
a fixed VSFT lump with operators defined by means of Laguerre polynomials whose
argument is quadratic in the string creation operators. The states obtained in
this way form an algebra under the SFT star product, which is isomorphic to a
corresponding algebra of GMS solitons under the Moyal product. In order to
obtain a regularized field theory limit we embed the theory in a constant
background B field.Comment: 1+16 pages; v2: typos corrected; v3: two appendices added, final
versio
Dressed Sliver solutions in Vacuum String Field Theory
We consider a new class of solutions (dressed slivers) in Vacuum String Field
Theory, which represent D25-branes. For each dressed sliver we introduce a
deformation parameter and define a family of states which are characterized by
new abelian star-subalgebras. We show that this deformation parameter can be
used as a regulator: it allows us to define for each such solution a finite
norm and energy density. Finally we show how to generalize these results to
parallel coincident and to lower dimensional branes.Comment: 39 pages, JHEP style. v2:minor corrections, references adde
Vacuum String Field Theory with B field
We continue the analysis of Vacuum String Field Theory in the presence of a
constant B field. In particular we give a proof of the ratio of brane tensions
is the expected one. On the wake of the recent literature we introduce
wedge-like states and orthogonal projections. Finally we show a few examples of
the smoothing out effects of the B field on some of the singularities that
appear in VSFT.Comment: 20 pages; v2: typos corrected, references added; final versio
Comments on lump solutions in SFT
We analyze a recently proposed scheme to construct analytic lump solutions in open SFT. We argue that in order for the scheme to be operative and to guarantee background independence it must be implemented in the same 2D conformal field theory in which SFT is formulated. We outline and discuss two different possible approaches. Next we reconsider an older proposal for analytic lump solutions and implement a few improvements. In the course of the analysis we formulate a distinction between regular and singular gauge transformations and advocate the necessity of defining a topology in the space of string fields
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