94 research outputs found
Near horizon superconformal symmetry of rotating BPS black holes in five dimensions
We investigate the asymptotic supersymmetry group of the near horizon region
of the BMPV black holes, which are the rotating BPS black holes in five
dimensions. When considering only bosonic fluctuations, we show that there
exist consistent boundary conditions and the corresponding asymptotic symmetry
group is generated by a chiral Virasoro algebra with the vanishing central
charge. After turning on fermionic fluctuations with the boundary conditions,
we also show that the asymptotic supersymmetry group is generated by a chiral
super-Virasoro algebra with the vanishing central extension. The super-Virasoro
algebra is originated in the AdS2 isometry supergroup of the near horizon
solution.Comment: 25 pages, Latex, no figure; references adde
Operator Formulation of Green-Schwarz Superstring in the Semi-Light-Cone Conformal Gauge
In this article we present a comprehensive account of the operator
formulation of the Green-Schwarz superstring in the semi-light-cone (SLC)
gauge, where the worldsheet conformal invariance is preserved. Starting from
the basic action, we systematically study the symmetry structure of the theory
in the SLC gauge both in the Lagrangian and the phase space formulations. After
quantizing the theory in the latter formulation we construct the quantum
Virasoro and the super-Poincare generators and clarify the closure properties
of these symmetry algebras. Then by making full use of this knowledge we will
be able to construct the BRST-invariant vertex operators which describe the
emission and the absorption of the massless quanta and show that they form the
appropriate representation of the quantum symmetry algebras. Furthermore, we
will construct an exact quantum similarity transformation which connects the
SLC gauge and the familiar light-cone (LC) gauge. As an application
BRST-invariant DDF operators in the SLC gauge are obtained starting from the
corresponding physical oscillators in the LC gauge.Comment: 88 pages, ptptex, no figure. Some clarifications are made and a
reference is added in section 6. Published versio
Renormalization Group Flow near the Superconformal Points in N=2 Supersymmetric Gauge Theories
The behavior of the beta-function of the low-energy effective coupling in the
N=2 supersymmetric SU(2) QCD with several massive matter hypermultiplets and in
the SU(3) Yang-Mills theory is determined near the superconformal points in the
moduli space. The renormalization group flow is unambiguously fixed by looking
at limited types of deformation near the superconformal points. It is pointed
out that the scaling dimension of the beta-function is controlled by the
scaling behavior of moduli parameters and the relation between them is
explicitly worked out. Our scaling dimensions of the beta-functions are
consistent in part with the results obtained recently by Bilal and Ferrari in a
different method for the SU(2) QCD.Comment: 16 pages, latex, no figure, some references adde
Three-Dimensional Extremal Black Holes and the Maldacena Duality
We discuss the microscopic states of the extremal BTZ black holes. Degeneracy
of the primary states corresponding to the extremal BTZ black holes in the
boundary N=(4,4) SCFT is obtained by utilizing the elliptic genus and the
unitary representation theory of N=4 SCA. The degeneracy is consistent with the
Bekenstein-Hawking entropy.Comment: 25 pages, Latex file, no figure, minor changes in section 2.2 and
several typos are correcte
Stimulated Emission of Dark Matter Axion from Condensed Matter Excitations
We discuss a possible principle for detecting dark matter axions in galactic
halos. If axions constitute a condensate in the Milky Way, stimulated emissions
of the axions from a type of excitation in condensed matter can be detectable.
We provide general mechanism for the dark matter emission, and, as a concrete
example, an emission of dark matter axions from magnetic vortex strings in a
type II superconductor are investigated along with possible experimental
signatures.Comment: 20 pages, no figure; corrected typos, added references, and minor
change
Making confining strings out of mesons
The light mesons such as pi, rho, omega, f0, and a0 are possible candidates
of magnetic degrees of freedom, if a magnetic dual picture of QCD exists. We
construct a linear sigma model to describe spontaneous breaking of the magnetic
gauge group, in which there is a stable vortex configuration of vector and
scalar mesons. We numerically examine whether such a string can be interpreted
as the confining string. By using meson masses and couplings as inputs, we
calculate the tension of the string as well as the strength of the Coulomb
force between static quarks. They are found to be consistent with those
inferred from the quarkonium spectrum and the Regge trajectories of hadrons. By
using the same Lagrangian, the critical temperature of the QCD phase transition
is estimated, and a non-trivial flavor dependence is predicted. We also discuss
a possible connection between the Seiberg duality and the magnetic model we
studied.Comment: 22 pages, 2 figures, 3 tables, typos corrected, references adde
Spectral-Function Sum Rules in Supersymmetry Breaking Models
The technique of Weinberg's spectral-function sum rule is a powerful tool for
a study of models in which global symmetry is dynamically broken. It enables us
to convert information on the short-distance behavior of a theory to relations
among physical quantities which appear in the low-energy picture of the theory.
We apply such technique to general supersymmetry breaking models to derive new
sum rules.Comment: 18 pages, 1 figur
Wheeler-DeWitt Equation in AdS/CFT Correspondence
We discuss a quantum extension of the holographic RG flow equation obtained
previously from the classical Hamiltonian constraint in the bulk AdS
supergravity. The Wheeler-DeWitt equation is proposed to generate the extended
RG flow and to produce 1/N subleading corrections systematically. Our
formulation in five dimensions is applied to the derivation of the Weyl anomaly
of boundary N=4 SU(N) super-Yang-Mills theory beyond the large N limit. It is
shown that subleading 1/N^2 corrections arising from fields in AdS_5
supergravity agree with those obtained recently by Mansfield et al. using their
Schroedinger equation, thereby guaranteeing to reproduce the exact form of the
boundary Weyl anomaly after summing up all of the KK modes.Comment: 7 pages, LaTex, references adde
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