Skwarnicki Abstract

No abstract provided.

Martin Abstract

I will describe a calculation of baryon-number violating matrix elements in the chiral bag model -- a phenomenological model where baryons are described by a bag of free quarks at short distance and a skyrmion at long distance. Since the skyrmion has a 'hole' from the bag, it can 'unwind' and shed its baryon number. The unwinding rate is determined by an instanton calculation, and we find the net result is an exponential suppression. The suppression depends on where we divide the skyrmion/bag, though this dependency should soften with higher order effects. Applied to proton decay, our calculation implies an additional O(10^-4) to O(10^-12) suppression of proton decay rates compared to naive expectations

Special Colloquium Abstract

The apparent greater-than-c speed of neutrinos between the CERN accelerator and LGNS OPERA detector at Gran Sasso in Italy is the subject of enormous interest and attention in the scientific community as well as in the media. This colloquium will discuss how the measurements were made, concepts of world-wide clock synchronizations using GPS coordinate time, and the details of the time difference measurements made in the experiment.  

Catterall Abstract

Supersymmetry and discrete spacetime have long been thought mutually incompatible. I will review the arguments for this and show how to go around them using ideas originating in topological field theory. I will show how this works in the simplest of models: supersymmetric quantum mechanics and then briefly describe how to boost the arguments up to derive a lattice action for N=4 super Yang Mills in four dimensions which possesses exact supersymmetry at non-zero lattice spacing.