A note on D-branes in group manifolds: flux quantisation and D0-charge

We show that a D-brane in a group manifold given by a (twisted) conjugacy class is characterised by a gauge invariant two-form field determined in terms of the matrix of gluing conditions. Using a quantisation argument based on the path integral one obtains the known quantisation condition for the corresponding D-branes. We find no evidence for the existence of a quantised U(1) gauge field flux. We propose an expression for the D0 charge of such D-branes.Comment: 13 pages. (v2: minor changes, some comments and references added.

D-branes in group manifolds

In this paper we re-examine the geometric interpretation of gluing conditions in WZW models and the possible D-brane configurations that they give rise to. We show how the boundary conditions are encoded in the gluing conditions imposed on the chiral currents. We analyse two special classes of gluing conditions: the first, which preserves the affine symmetry of the bulk theory, describes D-branes whose worldvolumes are given by `twisted' conjugacy classes; the second class describes configurations which include subgroups and cosets.Comment: 23 page

SHAPING COMPETITIVE ADVANTAGE FOR AGROECOLOGIC PRODUCTS

A competitive advantage exists when the company is able to deliver the same benefits as competitors but at a lower cost (cost advantage), or deliver benefits that exceed those of competing products (differentiation advantage). Thus, a competitive advantage enables the firm to create superior value for its customers and superior profits for itself. In order to develop a competitive advantage, the company must have resources and capabilities that are superior to those of its competitors. Resources such us patents and trademarks, proprietary know-how, reputation of the firm, brand name , are the firm specific assets useful for creating a cost or differentiation advantage and that few competitors can acquire easily . Classification-JEL: M21, O13competitive advantage, agroecologic products, cost advantage

A review of early warning system models

Financial crises have not declined in number, frequency or severity over the last two decades, rather the contrary. Each crisis causes enormous costs in the countries concerned. Thus, international financial institutions invest in researching early warning systems (EWS). The Early Warning System models can be made most useful to help sustain global growth and maintain financial stability, especially in light of the lessons learned from the current and past crises.Early Warning System models, financial crises

Classification and Quantum Moduli Space of D-branes in Group Manifolds

We study the classification of D-branes in all compact Lie groups including non-simply-laced ones. We also discuss the global structure of the quantum moduli space of the D-branes. D-branes are classified according to their positions in the maximal torus. We describe rank 2 cases, namely $B_2$, $C_2$, $G_2$, explicitly and construct all the D-branes in $B_r$, $C_r$, $F_4$ by the method of iterative deletion in the Dynkin diagram. The discussion of moduli space involves global issues that can be treated in terms of the exact homotopy sequence and various lattices. We also show that singular D-branes can exist at quantum mechanical level.Comment: latex2e, 13 pages, 3 figures. v4: A reference added. Version to appear in Phys. Lett.

D-branes in curved spacetime: Nappi-Witten background

We find exact D-brane configurations in the Nappi-Witten background using the boundary state approach and describe how they are related by T-duality transformations. We also show that the classical boundary conditions of the associated sigma model correspond to a field dependent automorphism relating the chiral currents and discuss the correspondence between the boundary state approach and the sigma model approach.Comment: 21 pages, 7 figures, references adde