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

Finite-N Conformality and Gauge Coupling Unification

In this talk I review some aspects of the idea that there is an infra-red conformal fixed-point at the TeV scale. In particular, it is shown how gauge coupling unification can be achieved by TeV unification in a semi-simple gauge group.Comment: 9 pages LaTeX. Invited talk at the 10th Tohwa International Symposium on String Theory, Fukuoka, Japan. July 3-7, 200

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

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

Remarks on the Cosmological Constant

The acceleration of the surface of last scatter (SLS) must somehow reflect the energy content within it. A test particle at the SLS is assumed to experience a linear combination of two forces: one Newtonian, the other pseudo-Newtonian describable by a cosmological constant ${\Lambda}$ in general relativity. In the ${\Lambda}$ description, which is surely too unimaginative, the size of ${\Lambda}$ reflects only the comparable magnitudes of the Newtonian and pseudo-Newtonian forces; any claim of fine tuning due to quantum mechanics is probably illusory.Comment: 6 pages, no figures; improved versio