1,119 research outputs found
A Note on the Holographic Beta and C Functions
The holographic RG flow in AdS/CFT correspondence naturally defines a
holographic scheme in which the central charge c and the beta function are
related by a universal formula. We perform some checks of that formula and we
compare it with quantum field theory expectations. We discuss alternative
definitions of the c-function. In particular, we compare, for a particular
supersymmetric flow, the holographic c-function with the central charge
computed directly from the two-point function of the stress-energy tensor.Comment: Version accepted for publication in Phys. Lett. B, expanded
introduction. 11 pages, 2 embedded eps figure
Flavor meson localization in 5d braneworld
We propose a brane-world, which contains flavor quarks and mesons, by
embedding dimensionally reduced D7-brane in both the supersymmetric and
non-supersymmetric 5d background which are obtained as the solutions of type
IIB supergravity compactified on Ad. In the supersymmetric case,
the RS brane can be put at any point of the fifth coordinate, but it is pushed
to the Ad boundary in the non-supersymmetric case. We study the
localization of the flavor mesons, the fluctuation-modes of D7-brane, on the
Randall-Sundrum brane in these backgrounds.Comment: 15 pages, 2 figure
Minimal Higgs Branch for the Breaking of Half of the Supersymmetries in N=2 Supergravity
It is shown that the minimal Higgs sector of a generic N=2 supergravity
theory with unbroken N=1 supersymmetry must contain a Higgs hypermultiplet and
a vector multiplet. When the multiplets parametrize the quaternionic manifold
SO(4,1)/SO(4), and the special Kahler manifold SU(1,1)/U(1), respectively, a
vanishing vacuum energy with a sliding massive spin 3/2 multiplet is obtained.
Potential applications to N=2 low energy effective actions of superstrings are
briefly discussed.Comment: 7 pages, plain Late
Stringy Instantons as Strong Dynamics
We study the relation between stringy instantons and strong dynamics effects
in type IIB toric quiver gauge theories. By exploiting the involutive property
of Seiberg duality we relate the classical constraint on the moduli space of
the gauge theory with the stringy instanton contribution to the superpotential.
The result holds for unitary, orthogonal and symplectic gauge groups.Comment: Minor corrections, reference added, published in JHE
Heterotic-Type II String Duality and the H-Monopole Problem
Since T-duality has been proved only perturbatively and most of the heterotic
states map into solitonic, non-perturbative, type II states, the 6-dimensional
string-string duality between the heterotic string and the type II string is
not sufficient to prove the S-duality of the former, in terms of the known
T-duality of the latter. We nevertheless show in detail that perturbative
T-duality, together with the heterotic-type II duality, does imply the
existence of heterotic H-monopoles, with the correct multiplicity and multiplet
structure. This construction is valid at a generic point in the moduli space of
heterotic toroidal compactifications.Comment: 12 pages, plain Late
On supersymmetry breaking and the Dijkgraaf-Vafa conjecture
We investigate the Dijkgraaf-Vafa proposal when supersymmetry is broken. We
consider U(N) SYM with chiral adjoint matter where the coupling constants in
the tree-level superpotential are promoted to chiral spurions. The holomorphic
part of the low-energy glueball superpotential can still be analyzed. We
compute the holomorphic supersymmetry breaking contributions using methods of
the geometry underlying the N=1 effective gauge theory viewed as a Whitham
system. We also study the change in the effective glueball superpotential using
perturbative supergraph techniques in the presence of spurions.Comment: 24 pages, LaTeX; minor changes, one reference added, version to
appear in JHE
Novel Local CFT and Exact Results on Perturbations of N=4 Super Yang Mills from AdS Dynamics
We find new, local, non-supersymmetric conformal field theories obtained by
relevant deformations of the N=4 super Yang Mills theory in the large
limit. We contruct interpolating supergravity solutions that naturally
represent the flow from the N=4 super Yang Mills UV theory to these
non-supersymmetric IR fixed points. We also study the linearization around the
N=4 superconformal point of N=1 supersymmetric, marginal deformations. We show
that they give rise to N=1 superconformal fixed points, as expected from
field-theoretical arguments.Comment: Version accepted by JHE
Confinement and Condensates Without Fine Tuning in Supergravity Duals of Gauge Theories
We discuss a solution of the equations of motion of five-dimensional gauged
type IIB supergravity that describes confining SU(N) gauge theories at large N
and large 't Hooft parameter. We prove confinement by computing the Wilson
loop, and we show that our solution is generic, independent of most of the
details of the theory. In particular, the Einstein-frame metric near its
singularity, and the condensates of scalar, composite operators are universal.
Also universal is the discreteness of the glueball mass spectrum and the
existence of a mass gap. The metric is also identical to a generically
confining solution recently found in type 0B theory.Comment: 19 pages, Late
Partial N=2 --> N=1 Local Supersymmetry Breaking and Solvable Lie Algebras
Generic partial supersymmetry breaking of N=2 supergravity with zero vacuum
energy and with surviving unbroken arbitrary gauge groups is exhibited.
Specific examples are given.Comment: 5 pages, 1 LaTeX-style file, 1 TeX, 2 Postscript figures. Seminar
given at the Work-Shop on "Gauge Theories, Applied Supersymmetry and Quantum
Gravity", Imperial College, London, 5-10 July 199
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