13 research outputs found
On SO(32) heterotic - type I superstring duality in ten dimensions
We provide some additional evidence in favour of the strong - weak coupling
duality between the SO(32) heterotic and type I superstring theories by
comparing terms quartic in the gauge field strength in their low-energy
effective actions. We argue that these terms should not receive higher-loop
string corrections so that duality should relate the leading-order perturbative
coefficients in the two theories. In particular, we demonstrate that the
coefficient of the -term in the one-loop (torus) part of the SO(32)
heterotic string action is exactly the same as the coefficient of the
-term in the tree-level (disc) part of the type I action.Comment: 11 pages, harvmac. Several comments added, final version to appear in
Physics Letters
Kinetics in one-dimensional lattice gas and Ising models from time-dependent density functional theory
Time-dependent density functional theory, proposed recently in the context of
atomic diffusion and non-equilibrium processes in solids, is tested against
Monte Carlo simulation. In order to assess the basic approximation of that
theory, the representation of non-equilibrium states by a local equilibrium
distribution function, we focus on one-dimensional lattice models, where all
equilibrium properties can be worked exactly from the known free energy as a
functional of the density. This functional determines the thermodynamic driving
forces away from equilibrium. In our studies of the interfacial kinetics of
atomic hopping and spin relaxation, we find excellent agreement with
simulations, suggesting that the method is useful also for treating more
complex problems.Comment: 8 pages, 5 figures, submitted to Phys. Rev.