N ov 1 99 6 Classical Gravity on Fuzzy Space - Time

N ov 1 99 6 Some Quantum Aspects of D = 3 Space - Time Massive Gravity

We discuss some features of Einstein-Proca gravity in D = 3 and 4 spacetimes. Our study includes a discussion on the tree-level unitarity and on the issue of light deflection in 3D gravity in the presence of a mass term. 1 [email protected] 2 [email protected]

ar X iv : g r - qc / 9 51 10 48 v 1 1 6 N ov 1 99 5 Two lectures on Two - Dimensional Gravity ∗

2 v 1 1 N ov 1 99 4 SPACE - TIME GEOMETRY OF THREE - DIMENSIONAL YANG - MILLS THEORY

It is shown that the SU (2) Yang-Mills theory in 3-dimensional Riemann-Cartan space-time can be completely reformulated as a gravity-like theory in terms of gauge invariant variables. The resulting Yang-Mills induced equations are found, and it is demonstrated that they can be derived from a torsion-square type of action.

N ov 1 99 9 Locally Weyl invariant massless bosonic and fermionic spin - 1 / 2 action in the ( Y 4 , g ) space - time .

Locally Weyl invariant massless bosonic and fermionic spin-1/2 action in the (Y 4 , g) space-time. Abstract We search for a real bosonic and fermionic action in four dimensions which both remain invariant under local Weyl transformations in the presence of contortion and non-metricity tensor. In the presence of the non-metricity tensor the investigation is extended to (W n , g) space-time while...

ar X iv : q ua nt - p h / 96 11 02 3 v 1 14 N ov 1 99 6 The Capacity of Quantum Channel with General Signal States

It is shown that the capacity of a classical-quantum channel with arbitrary (possibly mixed) states equals to the maximum of the entropy bound with respect to all apriori distributions. This completes the recent result of Hausladen, Jozsa, Schumacher, Westmoreland and Wooters [5], who proved the equality for the pure state channel. 1. Information and capacity for quantum channel. We start by re...