Spin-resolved second-order correlation energy of the two-dimensional uniform electron gas

For the two-dimensional electron gas, the exact high-density limit of the correlation energy is evaluated here numerically for all values of the spin polarization. The result is spin-resolved into $\uparrow\uparrow$, $\uparrow\downarrow$, and $\downarrow\downarrow$ contributions and parametrized analytically. Interaction-strength interpolation yields a simple model (LSD) for the correlation energy at finite densities.Comment: 5 pages, 2 figure

Discretized gravity on the hyperbolic disk

We consider a description of lattice gravity in six dimensions, where the two extra dimensions have been compactified on a warped hyperbolic disk of constant curvature. We analyze a fine-grained latticization of the hyperbolic disk in the context of an effective theory for massive gravitons. We find that in six-dimensional warped hyperbolic space, lattice gravity appears near the boundary of the disk more weakly coupled than in discretized five-dimensional flat or warped space. Specifically, near the IR branes, the local strong coupling scale can become as large as the local Planck scale.Comment: 4 pages, 2 figures, to appear in Proceedings of SUSY06, the 14th Conference on Supersymmetry and the Unification of Fundamental Interactions, UC Irvine, California, 12-17 June 200

Measuring Inequality Attitudes by Defective Leaky Buckets A Comment

Amiel et al. (1999) use the Atkinson and the Gini social welfare functions to measure income inequality attitudes based on data from leaky-bucket experiments. Yet the experimental de-sign does not allow their subjects to perceive income inequality according to the Gini or the Atkinson inequality measures. Moreover, their experimental design tries to measure inequal-ity aversion by forcing their subjects to behave in accordance with inequality predilection. --Inequality aversion,leaky-bucket experiment.

The Consultant-Client Relationship: A Systems-Theoretical Perspective

The aim of this paper is to explain consulting failure from a systems-theoretical perspective and to provide a new framework for analysing consultant–client relationships. By drawing on Luhmann’s systems theory, clients and consultants are conceptualised as two autopoietic communication systems that operate according to idiosyncratic logics. They are structurally coupled through a third system, the so-called “contact system”, which constitutes a separate discourse. Due to their different logics no transfer of meaning between the three discourses is possible. This contradicts the traditional notion of consulting as a means of providing solutions to the client’s problems: neither is the consultant able to understand the client’s problems nor is it possible to transfer any solutions into the client system. Instead, consulting interventions only cause perturbations in the client system. Consequently, the traditional functions of consulting are called into question. The paper discusses the implications of this analysis with relation to the traditional approach to consulting, and presents a tentative framework for a systemic concept of consulting