13 research outputs found
Novel field theory phenomena from F theory and D-branes
Talk presented in the 97 Karpatcz winter school. We describe Sen's work on F
theory on K3 and its reflection on the world-volume field theory on a D3-brane
probe. Field theories on a multiple of probes are analyzed. We construct a 4d
N=1 superconformal probe theory which is invariant under electric-magnetic
duality via a compactification to six dimensions on T^6/Z_2 x Z_2.Comment: latex file, 14 pages, 15 figs, epsf.sty, espcrc2.st
Multicharged Dyonic Integrable Models
We introduce and study new integrable models of A_n^{(1)}-Non-Abelian Toda
type which admit U(1)\otimes U(1) charged topological solitons. They correspond
to the symmetry breaking SU(n+1) \to SU(2)\otimes SU(2)\otimes U(1)^{n-2} and
are conjectured to describe charged dyonic domain walls of N=1 SU(n+1) SUSY
gauge theory in large n limit.
It is shown that this family of relativistic IMs corresponds to the first
negative grade q={-1} member of a dyonic hierarchy of generalized cKP type. The
explicit relation between the 1-soliton solutions (and the conserved charges as
well) of the IMs of grades q=-1 and q=2 is found. The properties of the IMs
corresponding to more general symmetry breaking SU(n+1) \to SU(2)^{\otimes
p}\otimes U(1)^{n-p} as well as IM with global SU(2) symmetries are discussed.Comment: 48pages, latex, v2. typos in eqns. (1.7) and (3.20) corrected, small
improvements in subsection 2.2, new reference added;v3. improvements in text
of Sect. 1,2 and 6; new Sect 7 and new refs. added; version to appear in
Nucl. Phys.
Soliton Spectrum of Integrable Models with Local Symmetries
The soliton spectrum (massive and massless) of a family of integrable models
with local U(1) and U(1)\otimes U(1) symmetries is studied. These models
represent relevant integrable deformations of SL(2,R) \otimes U(1)^{n-1} - WZW
and SL(2,R) \otimes SL(2,R)\otimes U(1)^{n-2} - WZW models. Their massless
solitons appears as specific topological solutions of the U(1) (or U(1)\otimes
U(1)) - CFTs. The nonconformal analog of the GKO-coset formula is derived and
used in the construction of the composite massive solitons of the ungauged
integrable models.Comment: 44 pages, Latex, 1 eps fig, few misprints corrected. to appear in
JHE