154 research outputs found
Exotic Scalar States in the AdS/CFT Correspondence
We investigate a family of solutions of Type IIb supergravity which
asymptotically approach AdS_5 X S^5 but contain a non-constant dilaton and
volume scalar for the five-sphere. These solutions preserve an SO(1,3) X SO(6)
symmetry. We discuss the solution in the context of the AdS/CFT correspondence,
and we find that as well as running coupling from the nontrivial dilaton, the
corresponding field theory has no supersymmetry and displays confinement at
least for a certain range of parameters.Comment: 18 pages. 3 figures. Revised discussion section, added references.
Final version to appear in JHE
Spin-Two Glueballs, Positive Energy Theorems and the AdS/CFT Correspondence
We determine the spectrum of graviton excitations in the background geometry
of the AdS soliton in p+2 dimensions. Via the AdS/CFT correspondence this
corresponds to determining the spectrum of spin two excitations in the dual
effective p-dimensional field theories For the cases of D3- and M5-branes these
are the spin two glueballs of QCD_3 and QCD_4 respectively. For all values of p
we find an exact degeneracy of the spectra of these tensor states and certain
scalar excitations. Our results also extend the perturbative proof of a
positive energy conjecture for asymptotically locally AdS spacetimes
(originally proposed for p=3) to an arbritrary number of dimensions.Comment: 25 pages, 3 figure
Education for social work as a self-regulating profession
The paper was given on 5 April 2000 as an invitational paper
at the university of Macerata in Italy upon the opening of
their new program preparing for social work (assistence
sociale) practice in Italy. The paper discusses models of social
work education which would prepare for free-standing,
self-regulated practice (una libera professione) of social
work, similar to professions of physicians, lawyers, accountants,
etc. there is discussion of international models
of social work practice, the general scope of work an advanced,
specialized practice
Family education and family therapy: tools for relational change
In this paper, I wish to outline the substantive base for family
education and family therapy in the necessary interaction of family
members to secure uniquely human needs –to create a secure
and safe base, to belong, to communicate, to have choices
within an ethical, relational framework, to grow, to interact, to
care for others and to love. Family interaction, if it is successful,
creates the context for human development and human care of
vulnerable persons –all of us. I will use these reflections on the
substance of family interaction briefly to discuss family therapy
and family education and raise questions for further work in this
area
Non-Abelian BIonic Brane Intersections
We study "fuzzy funnel" solutions to the non-Abelian equations of motion of
the D-string. Our funnel describes n^6/360 coincident D-strings ending on n^3/6
D7-branes, in terms of a fuzzy six-sphere which expands along the string. We
also provide a dual description of this configuration in terms of the world
volume theory of the D7-branes. Our work makes use of an interesting non-linear
higher dimensional generalization of the instanton equations.Comment: 17 pages uses harvmac; v2: small typos corrected, refs adde
A World-Volume Perspective on the Recombination of Intersecting Branes
We study brane recombination for supersymmetric configurations of
intersecting branes in terms of the world-volume field theory. This field
theory contains an impurity, corresponding to the degrees of freedom localized
at the intersection. The Higgs branch, on which the impurity fields condense,
consists of vacua for which the intersection is deformed into a smooth
calibrated manifold. We show this explicitly using a superspace formalism for
which the calibration equations arise naturally from F- and D-flatness.Comment: References adde
Fluctuating Fuzzy Funnels
It is well known that a D-string ending on a D3, D5 or D7 brane is described
in terms of a non-commutative fuzzy funnel geometry. In this article, we give a
numerical study of the fluctuations about this leading geometry. This allows us
to investigate issues related to the stability and moduli space of these
solutions. We comment on the comparison to the linearized fluctuations in
supergravity.Comment: 24 pages, 3 figures; v2 references added and correcte
- …