8,746 research outputs found

### The structure of N=3 multiplets in AdS_4 and the complete Osp(3|4) X SU(3) spectrum of M-theory on AdS_4 X N^{010}

In this paper, relying on previous results of one of us on harmonic analysis,
we derive the complete spectrum of Osp(3|4) X SU(3) multiplets that one obtains
compactifying D=11 supergravity on the unique homogeneous space N^{0,1,0} that
has a tri-sasakian structure, namely leads to N=3 supersymmetry both in the
four-dimensional bulk and on the three-dimensional boundary. As in previously
analyzed cases the knowledge of the Kaluza Klein spectrum, together with
general information on the geometric structure of the compact manifold is an
essential ingredient to guess and construct the corresponding superconformal
field theory. This is work in progress. As a bonus of our analysis we derive
and present the explicit structure of all unitary irreducible representations
of the superalgebra Osp(3|4) with maximal spin content s_{max}>=2.Comment: Latex2e, 13+1 page

### Compactifications on twisted tori with fluxes and free differential algebras

We describe free differential algebras for non-abelian one and two form gauge
potentials in four dimensions deriving the integrability conditions for the
corresponding curvatures. We show that a realization of these algebras occurs
in M-theory compactifications on twisted tori with constant four-form flux, due
to the presence of antisymmetric tensor fields in the reduced theory.Comment: Latex, 9 pages. v2: section 5 expanded, typos correcte

### Masses and Dualities in Extended Freedman-Townsend Models

We consider some generalizations of Freedman-Townsend models of
self-interacting antisymmetric tensors, involving couplings to further form
fields introduced by Henneaux and Knaepen. We show how these fields can provide
masses to the tensors by means of the Stueckelberg mechanism and implement the
latter in four-dimensional N=1 superspace. The duality properties of the form
fields are studied, and the paradoxical situation of a duality between a free
and an interacting theory is encountered.Comment: 5 pages; v2: minor changes, references added; v3: some
clarifications, published version; v4: generalized decoupling condition

### R-Symmetry, twisted N=2 Theory and the Role of the Dilaton

We discuss R-symmetry in locally supersymmetric $N=2$ gauge theories coupled
to hypermultiplets, which can be viewed as effective theories of heterotic
string models. In this type of supergravities a suitable R-symmetry exists and
can be used to topologically twist the theory. The vector multiplet of the
dilaton-axion field has a different R-charge assignment with respect to the
other vector multiplets.Comment: Proceedings of ``Susy95'', Palaiseaux, Ecole Polytechnique, May 95
LaTex, 8 pg

### On the supergravity formulation of mirror symmetry in generalized Calabi-Yau manifolds

We derive the complete supergravity description of the N=2 scalar potential
which realizes a generic flux-compactification on a Calabi-Yau manifold
(generalized geometry). The effective potential V_{eff}=V_{(\partial_Z V=0)},
obtained by integrating out the massive axionic fields of the special
quaternionic manifold, is manifestly mirror symmetric, i.e. invariant with
respect to {\rm Sp}(2 h_2+2)\times {\rm Sp}(2 h_1+2) and their exchange, being
h_1, h_2 the complex dimensions of the underlying special geometries. {\Scr
V}_{eff} has a manifestly N=1 form in terms of a mirror symmetric
superpotential W$ proposed, some time ago, by Berglund and Mayr.Comment: 14 pages, LaTeX sourc

### N=1 domain wall solutions of massive type II supergravity and the issue of mirror symmetry

We report on Domain Wall solution of Calabi-Yau compactifications with
general fluxes and their application to the study of mirror symmetry in
generalized backgrounds. We address, in particular, to the issue of magnetic
NSNS fluxes. We show that the Domain Wall gradient flow equations can be
interpreted as a set of generalized Hitchin's flow equations of a manifold with
SU(3)x SU(3) structure fibered along the direction transverse to the Domain
wall.Comment: To appear in the proceedings of 2nd RTN Network Workshop and Midterm
Meeting: Constituents, Fundamental Forces and Symmetries of the Universe,
Naples, Italy, 9-13 Oct 200

### Poincare' dual of D=4 N=2 Supergravity with Tensor Multiplets

We study, in an arbitrary even number D of dimensions, the duality between
massive D/2 tensors coupled to vectors, with masses given by an arbitrary
number of ``electric'' and ``magnetic'' charges, and (D/2-1) massive tensors.
We develop a formalism to dualize the Lagrangian of D=4, N=2 supergravity
coupled to tensor and vector multiplets, and show that, after the dualization,
it is equivalent to a standard D=4, N=2 gauged supergravity in which the
Special Geometry quantities have been acted on by a suitable symplectic
rotation.Comment: 15 pages, JHEP3 class, v2 typos corrected, references adde

### Extremal Black Holes in Supergravity and the Bekenstein-Hawking Entropy

We review some results on the connection among supergravity central charges,
BPS states and Bekenstein-Hawking entropy. In particular, N=2 supergravity in
four dimensions is studied in detail. For higher N supergravities we just give
an account of the general theory specializing the discussion to the N=8 case
when one half of supersymmetry is preserved. We stress the fact that for
extremal supergravity black holes the entropy formula is topological, that is
the entropy turns out to be a moduli independent quantity and can be written in
terms of invariants of the duality group of the supergravity theory.Comment: LaTeX, 65 pages. Contribution to the journal ``Entropy'', ISSN
1099-430

### Dyonic Masses from Conformal Field Strengths in D even Dimensions

We show that D/2--form gauge fields in D even dimensions can get a mass with
both electric and magnetic contributions when coupled to conformal
field--strengths whose gauge potentials is are \frac {D-2}{2}- forms. Denoting
by e^I_\L and m^{I\L} the electric and magnetic couplings, gauge invariance
requires: e^I_\L m^{J\L}\mp e^J_\L m^{I\L}=0, where I,\L= 1... m denote the
species of gauge potentials of degree D/2 and gauge fields of degree D/2-1,
respectively. The minus and plus signs refer to the two different cases D=4n
and D=4n+2 respectively and the given constraints are respectively {\rm
{Sp}}(2m) and {\rm {O}}(m,m) invariant. For the simplest examples, (I,\L=1 for
D=4n and I,\L=1,2 for D=4n+2) both the e,m quantum numbers contribute to the
mass \m=\sqrt {e^2 +m^2} . This phenomenon generalizes to $D$ even dimensions
the coupling of massive antisymmetric tensors which appear in D=4 supergravity
Lagrangians which derive from flux compactifications in higher dimensions. For
D=4 we give the supersymmetric generalization of such couplings using N=1
superspace.Comment: 11 pages, LaTeX source, typos corrected. Version to appear on
Phys.Lett.

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