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21 papers · 1 filter
Lyapunov Exponents and KS Entropy for the Lorentz Gas at Low Densities
Henk van Beijeren, J. R. Dorfman
The Lyapunov exponents and the KS entropy for a two dimensional Lorentz gas at low densities are defined for general non-equilibrium states and calculated with the use of a Lorentz…
Worldsheet formulations of gauge theories and gravity
Michael Reisenberger
The evolution operator for states of gauge theories in the graph representation (closely related to the loop representation of Gambini and Trias, and Rovelli and Smolin) is formula…
Lattice Regularization of Gauge Theories Without Loss of Chiral Symmetry
G. 't Hooft
A lattice regularization procedure for gauge theories is proposed in which fermions are given a special treatment such that all chiral flavor symmetries that are free of Adler-Bell…
Stochastic Tachyon Fluctuations, Marginal Deformations and Shock Waves in String Theory
Konstadinos Sfetsos
Starting with exact solutions to string theory on curved spacetimes we obtain deformations that represent gravitational shock waves. These may exist in the presence or absence of s…
On the interaction of spin 3/2 particles
V. Pascalutsa
Lagrangian of a massive particle with spin 3/2 is considered in the Rarita-Schwinger formalism. We discuss implications of the contact- and the gauge-transformation on the physical…
On Gravitational Shock Waves in Curved Spacetimes
Konstadinos Sfetsos
Some years ago Dray and 't Hooft found the necessary and sufficient conditions to introduce a gravitational shock wave in a particular class of vacuum solutions to Einstein's equat…