Canonical and Functional Schrodinger Quantization of Two--Dimensional Dilaton Gravity

We discuss the relation between canonical and Schrodinger quantization of the CGHS model. We also discuss the situation when background charges are added to cancel the Virasoro anomaly. New physical states are found when the square of the background charges vanishes.Comment: 12 pages, revtex Minor correction

Gauge Theoretic Formulation of Dilatonic Gravity Coupled to Particles

We discuss the formulation of the CGHS model in terms of a topological BF theory coupled to particles carrying non-Abelian charge.Comment: 4 pages. Talk given at QG99 Meeting, Sardinia, September 1999. Uses espcrc2.sty (twocolumn

Black Holes in the Gauge Theoretic Formulation of Dilatonic Gravity

We show that two-dimensional topological BF theories coupled to particles carrying non-Abelian charge admit a new coupling involving the Lagrange multiplier field. When applied to the gauge theoretic formulation of dilatonic gravity it gives rise to a source term for the gravitational field. We show that the system admits black hole solutions.Comment: Action is improved to be reparametrization invariant. Misprintings corrected. 10 pages, Late

Temperature Expansions for Magnetic Systems

We derive finite temperature expansions for relativistic fermion systems in the presence of background magnetic fields, and with nonzero chemical potential. We use the imaginary-time formalism for the finite temperature effects, the proper-time method for the background field effects, and zeta function regularization for developing the expansions. We emphasize the essential difference between even and odd dimensions, focusing on $2+1$ and $3+1$ dimensions. We concentrate on the high temperature limit, but we also discuss the $T=0$ limit with nonzero chemical potential.Comment: 25 pages, RevTe

Self-Duality and Maximally Helicity Violating QCD Amplitudes

I review some recent work that describes the close analogy between self-dual Yang--Mills amplitudes and QCD amplitudes with external gluons of positive helicity. This analogy is carried at tree level for amplitudes with two external quarks and up to one-loop for amplitudes involving only external gluons.Comment: 10 pages, LaTeX, no figures. Proceedings of the "Low Dimensional Field Theory Workshop, Telluride." Some ideas proposed by Duff and Isham have been include

An Example of Poincare Symmetry with a Central Charge

We discuss a simple system which has a central charge in its Poincare algebra. We show that this system is exactly solvable after quantization and that the algebra holds without anomalies.Comment: 11 pages, Revte

Geometric Gravitational Forces on Particles Moving in a Line

In two-dimensional space-time, point particles can experience a geometric, dimension-specific gravity force, which modifies the usual geodesic equation of motion and provides a link between the cosmological constant and the vacuum $\theta$-angle. The description of such forces fits naturally into a gauge theory of gravity based on the extended Poincar\'e group, {\it i.e.\/} ``string-inspired'' dilaton gravity.Comment: 10 pages, CTP#214

A PILOT STUDY OF PLANS THAT THE UNITED STATES FOOD INDUSTRY HAS FOR PARTICIPATING IN EASTERN EUROPE

Agribusiness, International Relations/Trade,