8,155 research outputs found
Exceptional SW Geometry from ALE Fibrations
We show that the genus 34 Seiberg-Witten curve underlying Yang-Mills
theory with gauge group yields physically equivalent results to the
manifold obtained by fibration of the ALE singularity. This reconciles a
puzzle raised by string duality
The Refined Elliptic Genus and Coulomb Gas Formulations of Superconformal Coset Models
We describe, in some detail, a number of different Coulomb gas formulations
of superconformal coset models. We also give the mappings between these
formulations. The ultimate purpose of this is to show how the Landau-Ginzburg
structure of these models can be used to extract the -generators, and to
show how the computation of the elliptic genus can be refined so as to extract
very detailed information about the characters of component parts of the model.Comment: 40 pages in harvmac, no figure
Quark Potentials in the Higgs Phase of Large N Supersymmetric Yang-Mills Theories
We compute, in the large N limit, the quark potential for
supersymmetric SU(N) Yang-Mills theory broken to . At
short distances the quarks see only the unbroken gauge symmetry and have an
attractive potential that falls off as 1/L. At longer distances the interquark
interaction is sensitive to the symmetry breaking, and other QCD states appear.
These states correspond to combinations of the quark-antiquark pair with some
number of W-particles. If there is one or more W-particles then this state is
unstable because of the coulomb interaction between the W-particles and between
the W's and the quarks. As L is decreased the W-particles delocalize and these
coulomb branches merge onto a branch with a linear potential. The quarks on
this branch see the unbroken gauge group, but the flux tube is unstable to the
production of W-particles.Comment: 23 pages, 7 figures, harvmac (b
Quartic Gauge Couplings from K3 Geometry
We show how certain F^4 couplings in eight dimensions can be computed using
the mirror map and K3 data. They perfectly match with the corresponding
heterotic one-loop couplings, and therefore this amounts to a successful test
of the conjectured duality between the heterotic string on T^2 and F-theory on
K3. The underlying quantum geometry appears to be a 5-fold, consisting of a
hyperk"ahler 4-fold fibered over a IP^1 base. The natural candidate for this
fiber is the symmetric product Sym^2(K3). We are lead to this structure by
analyzing the implications of higher powers of E_2 in the relevant Borcherds
counting functions, and in particular the appropriate generalizations of the
Picard-Fuchs equations for the K3.Comment: 32 p, harvmac; One footnote on page 11 extended; results unchanged;
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