Domain wall solutions of d-dimensional gravity coupled to a dilaton field σ with an exponential potential Λe are shown to be governed by an autonomous dynamical system, with a transcritical bifurcation as a function of the parameter λ when Λ < 0. All phase-plane trajectories are found exactly for λ = 0, including separatrices corresponding to walls that interpolate between adSd and adSd−1 × R, ...

The non-perturbative corrections to the universal hypermultiplet moduli space metric in the type-IIA superstring compactification on a Calabi-Yau threefold are investigated in the presence of 4d, N=2 supergravity. These corrections come from multiple wrapping of the BPS (Euclidean) D2-branes around certain (BPS) Calabi-Yau 3-cycles, and they are known as the D-instantons. The exact universal hy...

Drawing on the parallel between general relativity and Yang-Mills theory we obtain an exact Schwarzschild-like solution for SU(2) gauge fields coupled to a massless scalar field. Pushing the analogy further we speculate that this classical solution to the Yang-Mills equations shows confinement in the same way that particles become confined once they pass the event horizon of the Schwarzschild s...

The purpose of this article is to review the literature on the topic of deterministic vehicle routing problem (VRP) and to give a review on the exact and approximate solution techniques. More specifically the approximate (meta-heuristic) solution techniques are classified into: tabu search, simulated annealing, genetic algorithm, evolutionary algorithm, hybrid algorithm, and Ant Colony Opti...

We present a new algorithm for reliable point-location problem in a system of ddimensional hyperbolic surfaces. The problem is perpetual to many applications, including modeling of a molecular system represented as a set of polydisperse spheres through the use of the Euclidean d-dimensional Voronoi diagram. The algorithm is provided for the d-dimensional case and its implementation in a 3-dimen...

Abstract We propose an action for the D0-brane anti-D0-brane system that has its exact solution corresponding to marginal tachyon profile defined arbitrary constant separation of these D-branes. also find covariant formulation and generalization higher dimensional Dp-branes.

It is shown that new leading (0) as well as all-order solutions of String theory can be obtained by taking appropriate singular limits of the known solutions. We give several leading order solutions for the bosonic as well as the heterotic string. We then present all-order forms of the previously known two dimensional cosmological solutions. An all-order form for the cosmological solution in th...

Our previous results [J.Phys.: Condens. Matter 14 (2002) 13777] dealing with the analytical solution of the two-dimensional (2-D) Anderson localization problem due to disorder is generalized for anisotropic systems (two different hopping matrix elements in transverse directions). We discuss the mathematical nature of the metalinsulator phase transition which occurs in the 2-D case, in contrast ...

We derive a charged black hole solution in four dimensions described by SL(2, R)× SU(2)×U(1)/U(1)2 WZW coset model. Using the algebraic Hamiltonian method we calculate the corresponding solution that is exact to all orders in 1 k . It is shown that unlike the 2D black hole, the singularity remains also in the exact solution, and moreover, in some range of the gauge parameter the space-time does...

1 We present an asymptotically exact solution of the ∞ − d Hubbard model at a special interaction strength U T corresponding to the strong-coupling Fermi-liquid fixed point. This solution is intimately related to the Toulouse limit of the single-impurity Kondo model and the symmetric Anderson model in its strong-coupling limit.