7 research outputs found
Locally supersymmetric D=3 non-linear sigma models
We study non-linear sigma models with N local supersymmetries in three
space-time dimensions. For N=1 and 2 the target space of these models is
Riemannian or Kahler, respectively. All N>2 theories are associated with
Einstein spaces. For N=3 the target space is quaternionic, while for N=4 it
generally decomposes into two separate quaternionic spaces, associated with
inequivalent supermultiplets. For N=5,6,8 there is a unique (symmetric) space
for any given number of supermultiplets. Beyond that there are only theories
based on a single supermultiplet for N=9,10,12 and 16, associated with coset
spaces with the exceptional isometry groups , ,
and , respectively. For and the
theories obtained by dimensional reduction are two-loop finite.Comment: 35 pages plain tex, CERN-TH.6612/92 THU-92-1
Mechanism of single-spin asymmetries generation in the inclusive hadron processes
We discuss a nonperturbative mechanism for generation of the single-spin
asymmetries in hadron interactions. It is based on the chiral quark model
combined with unitarity and impact parameter picture and provides explanation
for the experimental regularities observed under the measurements of the spin
asymmetries.Comment: 20 pages, 7 figure
A semi-classical limit of the gauge/string correspondence
A world-sheet sigma model approach is applied to string theories dual to
four-dimensional gauge theories, and semi-classical soliton solutions
representing highly excited string states are identified which correspond to
gauge theory operators with relatively small anomalous dimensions. The simplest
class of such states are strings on the leading Regge trajectory, with large
spin in AdS_5. These correspond to operators with many covariant derivatives,
whose anomalous dimension grows logarithmically with the space-time spin. In
the gauge theory, the logarithmic scaling violations are similar to those found
in perturbation theory. Other examples of highly excited string states are also
considered.Comment: 19 pages, latex, one figure. v2: references added, improved
discussion. v3: another ref added, minor corrections, version to appear in
NP
QCD and strongly coupled gauge theories : challenges and perspectives
We highlight the progress, current status, and open challenges of QCD-driven physics, in theory and in experiment. We discuss how the strong interaction is intimately connected to a broad sweep of physical problems, in settings ranging from astrophysics and cosmology to strongly coupled, complex systems in particle and condensed-matter physics, as well as to searches for physics beyond the Standard Model. We also discuss how success in describing the strong interaction impacts other fields, and, in turn, how such subjects can impact studies of the strong interaction. In the course of the work we offer a perspective on the many research streams which flow into and out of QCD, as well as a vision for future developments.Peer reviewe