118 research outputs found
Macroscopic superstrings as interpolating solitons
It is known that, in string sigma-model metric, the `extreme' fivebrane
solution of D=10 supergravity interpolates between D=10 Minkowski spacetime and
a supersymmetric compactification to a linear dilaton vacuum. We show
here that, in {\it fivebrane} sigma-model metric, the extreme string solution
of D=10 supergravity interpolates between Minkowski spacetime and a hitherto
unknown supersymmetric compactification of d=10 supergravity to a
three-dimensional anti-de Sitter generalization of the linear dilaton vacuum,
which may be invariantly characterized in terms of conformal
Killing vectors. The dilaton field diverges near the string core but this
divergence may be eliminated by re-interpreting the string solution as the
extreme membrane solution of 11-dimensional supergravity. We show that the
latter has an analytic extension through a regular degenerate event horizon to
an interior region containing a curvature singularity. We obtain analogous
results for other extended object solutions of supergravity theories.Comment: 12 page
Anti-gravitating BPS monopoles and dyons
We show that the exact static, i.e. `anti-gravitating', magnetic multi
monopole solutions of the Einstein/Maxwell/dilaton-YM/Higgs equations found by
Kastor, London, Traschen, and the authors, for arbitrary non-zero dilaton
coupling constant , are equivalent to the string theory BPS magnetic
monopole solutions of Harvey and Liu when . For this value of ,
the monopole solutions also solve the equations of five-dimensional
supergravity/YM theory. We also discuss some features of the dyon solutions
obtained by boosting in the fifth dimension and some features of the moduli
space of anti-gravitating multi-monopoles.Comment: 15 pp. Phyzz
Supergravity solitons and non-perturbative superstrings
A review is given of the implications of supersymmetric black holes for the
non-perturbative formulation of toroidally compactified superstrings, with
particular emphasis on symmetry enhancement at special vacua and S-duality of
the heterotic string.Comment: Latex 8pp. To appear in Procs. of 1995 Trieste Spring Superstring
School and Worksho
Open M5-branes
We show how, in heterotic M-theory, an M5-brane in the 11-dimensional bulk
may end on an ``M9-brane'' boundary, the M5-brane boundary being a Yang
monopole 4-brane. This possibility suggests various novel 5-brane
configurations of heterotic M-theory, in particular a static M5-brane suspended
between the two M9-brane boundaries, for which we find the asymptotic heterotic
supergravity solution.Comment: 4 pages, 3 figures, version to appear in PR
Gauged Supergravity Vacua From Intersecting Branes
Domain wall and electrovac solutions of gauged N=4 D=4 supergravity, with
gauge group SU(2) or SU(2)xSU(2), are interpreted as supersymmetric
Kaluza-Klein vacua of N=1 D=10 supergravity. These vacua are shown to be the
near-horizon geometries of certain intersecting brane solutions.Comment: 13 pages, no figures, Latex. Revised to take into account some
earlier work on the subject. A typo in an equation has been correcte
Black Holes and Calogero Models
We argue that the large limit of the -particle
superconformal Calogero model provides a microscopic description of the extreme
Reissner-Nordstr{\"o}m black hole in the near-horizon limit.Comment: Revtex 5pp. Revision includes improved discussion of entropy and
includes an additional referenc
Supersymmetric Self-Gravitating Solitons
We show that the `instantonic' soliton of five-dimensional Yang-Mills theory
and the closely related BPS monopole of four-dimensional Yang-Mills/Higgs
theory continue to be exact static, and stable, solutions of these field
theories even after the inclusion of gravitational, electromagnetic and, in the
four-dimensional case, dilatonic interactions, provided that certain
non-minimal interactions are included. With the inclusion of these
interactions, which would be required by supersymmetry, these exact
self-gravitating solitons saturate a gravitational version of the Bogomol'nyi
bound on the energy of an arbitrary field configuration.Comment: 39 pages, DAMTP R-93/27, phyzz
Solitons in supersymmetric sigma-models with torsion
We derive a bound on the energy of the general (p,q)-supersymmetric
two-dimensional massive sigma model with torsion, in terms of the topological
and Noether charges that appear as central charges in its supersymmetry
algebra.The bound is saturated by soliton solutions of first-order
Bogomol'nyi-type equations. This generalizes results obtained previously for
p=q models without torsion. We give examples of massive (1,1) models with
torsion that have a group manifold as a target space. We show that they
generically have multiple vacua and find an explicit soliton solution of an
SU(2) model. We also construct a new class of zero torsion massive (4,4) models
with multiple vacua and soliton solutions. In addition, we compute the metrics
on the one-soliton moduli spaces for those cases for which soliton solutions
are known explicitly, and discuss their interpretation.Comment: Phyzzx.tex, 30 pages, no figure
Domain Walls from Anti-de Sitter Spacetime
We examine -brane solutions in supergravities, showing that they fall
into four categories depending on the details of the dilaton coupling. In
general they describe domain walls, although in one of the four categories the
metric describes anti-de Sitter spacetime. We study this case, and its
dimensional reduction to a more conventional domain wall in detail, focussing
in particular on the manner in which the unbroken supersymmetry of the anti-de
Sitter solution is partially broken by the dimensional reduction to the domain
wall.Comment: Latex, 13 pages, no figures, introduction revised and references
adde
Dyonic p-branes from self-dual (p+1)-branes
The `electromagnetic' Sl(2;\bZ) duality group in spacetime dimension
can be given a Kaluza-Klein interpretation in as the modular group of
a compactifying torus. We show how dyonic -branes in can be
interpreted as self-dual -branes in wound around the homology
cycles of the torus. In particular, dyons of the D=4 N=4 heterotic string
theory are interpreted as winding modes of a D=6 self-dual string, while D=8
dyonic membranes are interpreted as wound 3-branes of D=10 IIB superstring
theory. We also discuss the T-dual IIA interpretations of D=8 dyonic membranes.Comment: 16 pp. phyzzx. 1 fi
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