Dark Energy from Strings

A long-standing problem of theoretical physics is the exceptionally small value of the cosmological constant $\Lambda \sim 10^{-120}$ measured in natural Planckian units. Here we derive this tiny number from a toroidal string cosmology based on closed strings. In this picture the dark energy arises from the correlation between momentum and winding modes that for short distances has an exponential fall-off with increasing values of the momenta. The freeze-out by the expansion of the background universe for these transplanckian modes may be interpreted as a frozen condensate of the closed-string modes in the three non-compactified spatial dimensions.Comment: 10 pages LaTeX. Talk at Coral Gables Conference, December 12-16, 200

Connecting Link Between Leptogenesis and Oscillations

It is shown how, in a class of models, the sign of the baryon number of the universe can be related to CP violation in neutrino oscillation experiments.Comment: 5 pages LaTeX. Talk at the Third Tropical Workshop on Particles and Cosmology. San Juan, Puerto Rico. August 200

Status of the Standard Model of Particle Phenomenology

The standard model is healthy is all respects except for the non-zero neutrino masses which require an extension of the minimal versionComment: 7 pages. Talk at Beyond the Standard Model EURESCO Conference Portoroz, Slovenia. July 200

Identification of All Dark Matter as Black Holes

For the universe I use dimensionless entropy $S/k = \ln \Omega$ for which the most convenient unit is the googol ($10^{100}$) and identify all dark matter as black holes whereupon the present entropy is about a thousand googols. While the energy of the universe has been established to be about 0.04 baryons, 0.24 dark matter and 0.72 dark energy, the cosmological entropy is almost entirely, about $(1 - 10^{-15})$, from black holes and only $10^{-15}$ from everything else. This identification of all dark matter as black holes is natural in statistical mechanics.Comment: Discussion update

Spontaneous CP Violation

In this talk I begin with some general discussion of the history of CP violation, then move on to aspects of the aspon model including the production of new particles at LHC, implications for B decay, generalized Cabibbo mixing and a reevaluation of kaon CP violation. Finally there is a summary.Comment: 5 pages Latex. Talk at Tropical Conference on Particles Physics and Cosmology. San Juan, Puerto Rico. April 1-7, 199

Leptoquarks

In this review there is first a survey of the HERA data. Then we discuss the theory response including querying the consistency of the data, compositeness, contact terms, and leptoquarks including as a special case the R symmetry violating squark. The SU(15) possibility for a light leptoquark is mentioned. Finally there is a summary.Comment: 6 pages. Talk at Beyond the Standard Model V. Balholm, Balestrand, Norway. April 29 - May 4, 1997. Uses aipproc2 styl