19 research outputs found
AdS/CFT Equivalence Transformation
We show that any conformal field theory in d-dimensional Minkowski space, in
a phase with spontaneously broken conformal symmetry and with the dilaton among
its fields, can be rewritten in terms of the static gauge (d-1)-brane on
AdS_(d+1) by means of an invertible change of variables. This nonlinear
holographic transformation maps the Minkowski space coordinates onto the brane
worldvolume ones and the dilaton onto the transverse AdS brane coordinate. One
of the consequences of the existence of this map is that any (d-1)-brane
worldvolume action on AdS_(d+1)\times X^m (with X^m standing for the sphere S^m
or more complicated curved manifold) admits an equivalent description in
Minkowski space as a nonlinear and higher-derivative extension of some
conventional conformal field theory action, with the conformal group being
realized in a standard way. The holographic transformation explicitly relates
the standard realization of the conformal group to its field-dependent
nonlinear realization as the isometry group of the brane AdS_(d+1) background.
Some possible implications of this transformation, in particular, for the study
of the quantum effective action of N=4 super Yang-Mills theory in the context
of AdS/CFT correspondence, are briefly discussed.Comment: LaTeX, 19 pages, minor correction in Abstrac
Conformal Higher Spin Symmetries of 4d Massless Supermultiplets and Invariant Equations in Generalized (Super)Space
Realization of the conformal higher spin symmetry on the 4d massless field
supermultiplets is given. The self-conjugated supermultiplets, including the
linearized SYM theory, are considered in some detail. Duality
between non-unitary field-theoretical representations and the unitary
doubleton--type representations of the 4d conformal algebra is
formulated in terms of a Bogolyubov transform. The set of 4d massless fields of
all spins is shown to form a representation of .
The obtained results are extended to the generalized superspace invariant
under supersymmetries. World line particle interpretation of the
free higher spin theories in the invariant (super)space is
given. Compatible with unitarity free equations of motion in the
invariant (super)space are formulated. A conjecture on the chain of
dualities in the higher spin
gauge theories is proposed.Comment: Latex, 63 pages; no figures.V2 Typos corrected, References updated.
V3.Typos correced, references and an explanation on the relationship with
previous work in section 4 are added. The version to appear in Phys.Rev.
A Fuzzy Linguistic Multi-agent Model for Information Gathering on the Web Based on Collaborative Filtering Techniques
Information gathering in Internet is a complex activity. A
solution consists in to assist Internet users in their information gathering
processes by means of distributed intelligent agents in order to find the
fittest information to their information needs. In this paper we describe a
fuzzy linguistic multi-agent model that incorporates information filtering
techniques in its structure, i.e., a collaborative filtering agent. In such a
way, the information filtering possibilities of multi-agent system on the
Web are increased and its retrieval results are improved.Research Project TIC2003-0797