Perturbative and non-perturbative monodromies in N=2 heterotic string vacua

In this talk we summarise our recent results on perturbative and non-perturbative monodromies in four-dimensional heterotic strings with $N=2$ space-time supersymmetry, and we compare our results with the rigid $SU(2)$ $N=2$ Yang-Mills monodromies.Comment: 6 pages, latex using espcrc2. Based on Talks given at the 29th International Symposium on the Theory of Elementary Particles, Buckow, August 1995 and at the 5th Hellenic School and Workshop on Elementary Particle Physics, Corfu, September 199

Recent results for source function imaging from AGS through CERN SPS to RHIC

Recent femtoscopic measurements involving the use of an imaging technique and a newly developed moment analysis are presented and discussed. We show that this new paradigm allows robust investigation of reaction dynamics for which the sound speed $c_s \neq 0$ during an extended hadronization period. Source functions extracted for charged pions produced in Au+Au and Pb+Pb collisions show non-Gaussian tails for a broad selection of collision energies. The ratio of the RMS radii of these source functions in the out and side directions are found to be greater than 1, suggesting a finite emission time for pions.Comment: Proceedings, XXXVI International Symposium on Multiparticle Dynamics/Workshop on Particle Correlations and Femtoscopy, Brazil, 200

World-volumes and string target spaces

String duality suggests a fascinating juxtoposition of world-volume and target-space dynamics. This is particularly apparent in the $D$-brane description of stringy solitons that forms a major focus of this article (which is {\it not} intended to be a comprehensive review of this extensive subject). The article is divided into four sections: 1. The oligarchy of string world-sheets 2. $p$-branes and world-volumes 3. World-sheets for world-volumes 4. Boundary states, $D$-branes and space-time supersymmetry [This article is based on a talk presented at the CERN Workshop on String Duality (December, 1995) and the published version of a talk at the Buckow Symposium (September, 1995).]Comment: 17 page