2,709 research outputs found

### A tachyon lump in closed string field theory

We find a codimension one lump solution of closed bosonic string field
theory. We consider vertices up to quartic order and include in the string
field the tachyon, the ghost dilaton, and a metric fluctuation. While the
tachyon profile clearly is that of a lump, we observe that the ghost dilaton is
roughly constant in the direction transverse to the lump, equal to the value it
takes in the nonperturbative tachyon vacuum. We explain, with a simple model,
why this should be expected.Comment: 13 pages, 4 figures; typos corrected; clarifications adde

### Delays in Open String Field Theory

We study the dynamics of light-like tachyon condensation in a linear dilaton
background using level-truncated open string field theory. The equations of
motion are found to be delay differential equations. This observation allows us
to employ well-established mathematical methods that we briefly review. At
level zero, the equation of motion is of the so-called retarded type and a
solution can be found very efficiently, even in the far light-cone future. At
levels higher than zero however, the equations are not of the retarded type. We
show that this implies the existence of exponentially growing modes in the
non-perturbative vacuum, possibly rendering light-like rolling unstable.
However, a brute force calculation using exponential series suggests that for
the particular initial condition of the tachyon sitting in the false vacuum in
the infinite light-cone past, the rolling is unaffected by the unstable modes
and still converges to the non-perturbative vacuum, in agreement with the
solution of Hellerman and Schnabl. Finally, we show that the growing modes
introduce non-locality mixing present with future, and we are led to conjecture
that in the infinite level limit, the non-locality in a light-like linear
dilaton background is a discrete version of the smearing non-locality found in
covariant open string field theory in flat space.Comment: 48 pages, 14 figures. v2: References added; Section 4 augmented by a
discussion of the diffusion equation; discussion of growing modes in Section
4 slightly expande

### The Identity String Field and the Tachyon Vacuum

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 use level truncation to show that as the level is
increased, the identity becomes more accurately Q-exact. We carry our
computations up to level nine, where an accuracy of 3% is attained. Our work
supports, under a new light, Sen's conjecture concerning the absence of open
string degrees of freedom around the tachyon vacuum. As a by-product, a new and
simple expression for I in terms of Virasoro operators is found.Comment: 25 pages, 1 figure, references adde

### The nonperturbative closed string tachyon vacuum to high level

We compute the action of closed bosonic string field theory at quartic order
with fields up to level ten. After level four, the value of the potential at
the minimum starts oscillating around a nonzero negative value, in contrast
with the proposition made in [5]. We try a different truncation scheme in which
the value of the potential converges faster with the level. By extrapolating
these values, we are able to give a rather precise value for the depth of the
potential.Comment: 24 pages. v2: typos corrected, clarified extrapolation in scheme B,
and added extrapolated tachyon and dilaton vev's at the end of Section

### D-branes as Tachyon Lumps in String Field Theory

It has been conjectured that the tachyonic lump solution of the open bosonic
string field theory describing a D-brane represents a D-brane of one lower
dimension. We place the lump on a circle of finite radius and develop a variant
of the level expansion scheme that allows systematic account of all higher
derivative terms in the string field theory action, and gives a calculational
scheme that can be carried to arbitrary accuracy. Using this approach we obtain
lump masses that agree with expected D-brane masses to an accuracy of about 1%.
We find convincing evidence that in string field theory the lump representing a
D-brane is an extended object with a definite profile. A gaussian fit to the
lump gives a 6-sigma size of 9.3 \sqrt{\alpha'}. The level truncation scheme
developed here naturally gives rise to an infrared and ultraviolet cut-off, and
may be useful in the study of quantum string field theory.Comment: LaTeX file, epsf, 8 figures, 40 page

### Tachyon condensation in open-closed p-adic string theory

We study a simple model of p-adic closed and open strings. It sheds some
light on the dynamics of tachyon condensation for both types of strings. We
calculate the effect of static and decaying D-brane configurations on the
closed string background. For closed string tachyons we find lumps analogous to
D-branes. By studying their fluctuation spectrum and the D-branes they admit,
we argue that closed string lumps should be interpreted as spacetimes of lower
dimensionality described by some noncritical p-adic string theory.Comment: 21 pages, 3 figures; v2: discussion of the fluctuations of the double
lump substantially improve

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