12 research outputs found
Novel Domain Wall and Minkowski Vacua of D=9 Maximal SO(2) Gauged Supergravity
We show that a generalised reduction of D=10 IIB supergravity leads, in a
certain limit, to a maximally extended SO(2) gauged supergravity in D=9. We
show the scalar potential of this model allows both Minkowski and a new type of
domain wall solution to the Bogomol'nyi equations. We relate these vacua to
type IIB D-branes.Comment: 28 pages, 1 figure, Latex2
Massive IIA supergravity from the topologically massive D-2-brane
The superfield equations of massive IIA supergravity, in the form of
constraints on the superspace geometry, are shown to be implied by
-symmetry of the topologically massive D-2-brane.Comment: 19 pp. Minor corrections. To appear in PL
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
Compactifications with S-Duality Twists
We consider generalised Scherk Schwarz reductions of supergravity and
superstring theories with twists by electromagnetic dualities that are
symmetries of the equations of motion but not of the action, such as the
S-duality of D=4, N=4 super-Yang-Mills coupled to supergravity. The reduction
cannot be done on the action itself, but must be done either on the field
equations or on a duality invariant form of the action, such as one in the
doubled formalism in which potentials are introduced for both electric and
magnetic fields. The resulting theory in odd-dimensions has massive form fields
satisfying a self-duality condition . We construct such theories
in D=3,5,7.Comment: Latex, 26 pages. References adde
Domain Walls in Massive Supergravities
We show how toroidally-compactified eleven-dimensional supergravity can be
consistently truncated to yield a variety of maximally-supersymmetric
``massive'' supergravities in spacetime dimensions . The mass terms
arise as a consequence of making a more general ansatz than that in usual
Kaluza-Klein dimensional reduction, in which one or more axions are given an
additional linear dependence on one of the compactification coordinates. The
lower-dimensional theories are nevertheless consistent truncations of
eleven-dimensional supergravity. Owing to the fact that the generalised
reduction commutes neither with U-duality nor with ordinary dimensional
reduction, many different massive theories can result. The simplest examples
arise when just a single axion has the additional linear coordinate dependence.
We find five inequivalent such theories in D=7, and 71 inequivalent ones in
D=4. The massive theories admit no maximally-symmetric vacuum solution, but
they do admit -brane solutions, i.e. domain walls, which preserve half
the supersymmetry. We present examples of these solutions, and their oxidations
to D=11. Some of the latter are new solutions of D=11 supergravity.Comment: latex, 32 papes, no figures, further comments and references adde
Domain Walls of D=8 Gauged Supergravities and their D=11 Origin
Performing a Scherk-Schwarz dimensional reduction of D=11 supergravity on a
three-dimensional group manifold we construct five D=8 gauged maximal
supergravities whose gauge groups are the three-dimensional (non-)compact
subgroups of SL(3,R). These cases include the Salam-Sezgin SO(3) gauged
supergravity. We construct the most general half-supersymmetric domain wall
solutions to these five gauged supergravities. The generic form is a triple
domain wall solution whose truncations lead to double and single domain wall
solutions. We find that one of the single domain wall solutions has zero
potential but nonzero superpotential.
Upon uplifting to 11 dimensions each domain wall becomes a purely
gravitational 1/2 BPS solution. The corresponding metric has a 7+4 split with a
Minkowski 7-metric and a 4-metric that corresponds to a gravitational
instanton. These instantons generalize the SO(3) metric of Belinsky, Gibbons,
Page and Pope (which includes the Eguchi-Hanson metric) to the other Bianchi
types of class A.Comment: 23 pages, 1 figure, minor changes, references adde
Duality Twists, Orbifolds, and Fluxes
We investigate compactifications with duality twists and their relation to
orbifolds and compactifications with fluxes. Inequivalent compactifications are
classified by conjugacy classes of the U-duality group and result in gauged
supergravities in lower dimensions with nontrivial Scherk-Schwarz potentials on
the moduli space. For certain twists, this mechanism is equivalent to
introducing internal fluxes but is more general and can be used to stabilize
some of the moduli. We show that the potential has stable minima with zero
energy precisely at the fixed points of the twist group. In string theory, when
the twist belongs to the T-duality group, the theory at the minimum has an
exact CFT description as an orbifold. We also discuss more general twists by
nonperturbative U-duality transformations.Comment: 30 pages, harvmac, references and brief comments on gauged
supergravity adde
The Gaugings of Maximal D=6 Supergravity
We construct the most general gaugings of the maximal D=6 supergravity. The
theory is (2,2) supersymmetric, and possesses an on-shell SO(5,5) duality
symmetry which plays a key role in determining its couplings. The field content
includes 16 vector fields that carry a chiral spinor representation of the
duality group. We utilize the embedding tensor method which determines the
appropriate combinations of these vectors that participate in gauging of a
suitable subgroup of SO(5,5). The construction also introduces the magnetic
duals of the 5 two-form potentials and 16 vector fields.Comment: 34 pages, latex, reference added, typo's corrected and minor
improvements mad
Stringy cosmic strings in matter coupled N=2, d=4 supergravity
We extend the system of ungauged N=2, d=4 supergravity coupled to vector
multiplets and hypermultiplets with 2-form potentials. The maximal number of
2-form potentials that one may introduce is equal to the number of isometries
of either the special Kaehler or quaternionic Kaehler sigma model. We show that
the local supersymmetry algebra can be realized on the 2-form potentials. These
2-forms couple electrically to strings which we refer to as stringy cosmic
strings. The 1/2 BPS bosonic world-sheet actions for these strings are
constructed and we discuss the properties of the 1/2 BPS stringy cosmic string
solutions.Comment: 36 pages, added references, corrected typos, modificated Appendix