The spinorial energy functional: solutions of the gradient flow on Berger spheres

We study the negative gradient flow of the spinorial energy functional (introduced by Ammann, Wei{\ss}, and Witt) on 3-dimensional Berger spheres. For a certain class of spinors we show that the Berger spheres collapse to a 2-dimensional sphere. Moreover, for special cases, we prove that the volume-normalized standard 3-sphere together with a Killing spinor is a stable critical point of the volume-normalized version of the flow. Our results also include an example of a critical point of the volume-normalized flow on the 3-sphere, which is not a Killing spinor.Comment: Minor typo corrected, added a sentence in the abstrac

Languages and Postmodern Ethnic Identities

Specific discourses of our mother tongue (which is not always our mother\u27s tongue) are supposed to decisively constitute our subjectivity. These discourses which are constituting us and are available to us offer possible identities. These identities carry ethno-culturally-specific meanings, which are symbolised within and by spoken, written, and non-verbal language/s. Are languages given the same relevance when giving meaning to postmodern ethnicity, if one understands postmodern ethnicity as a stance of simultaneously transcending ethnicity as a complete, self-contained system but retaining it as a selectively preferred, evolving, participatory system? Multilinguality, as it may correspond with aspects of postmodern ethnicity, seems to imply an interaction between different languages with their distinct understanding of self and the world which manifests in a kaleidoscopic view, temporarily creating new constellations of meaning

Method of coating circuit paths on printed circuit boards with solder Patent

Solder coating process for printed copper circuit protectio

Surface tension of isotropic-nematic interfaces: Fundamental Measure Theory for hard spherocylinders

A fluid constituted of hard spherocylinders is studied using a density functional theory for non-spherical hard particles, which can be written as a function of weighted densities. This is based on an extended deconvolution of the Mayer $f$-function for arbitrarily shaped convex hard bodies in tensorial weight functions, which depend each only on the shape and orientation of a single particle. In the course of an examination of the isotropic- nematic interface at coexistence the functional is applied to anisotropic and inhomogeneous problems for the first time. We find good qualitative agreement with other theoretical predictions and also with Monte-Carlo simulations

Finite-size scaling above the upper critical dimension

We present a unified view of finite-size scaling (FSS) in dimension d above the upper critical dimension, for both free and periodic boundary conditions. We find that the modified FSS proposed some time ago to allow for violation of hyperscaling due to a dangerous irrelevant variable, applies only to k=0 fluctuations, and so there is only a single exponent eta describing power-law decay of correlations at criticality, in contrast to recent claims. With free boundary conditions the finite-size "shift" is greater than the rounding. Nonetheless, using T-T_L, where T_L is the finite-size pseudocritical temperature, rather than T-T_c, as the scaling variable, the data does collapse on to a scaling form which includes the behavior both at T_L, where the susceptibility chi diverges like L^{d/2} and at the bulk T_c where it diverges like L^2. These claims are supported by large-scale simulations on the 5-dimensional Ising model.Comment: 11 pages, 15 figure

Spin glasses in the non-extensive regime

Spin systems with long-range interactions are "non-extensive" if the strength of the interactions falls off sufficiently slowly with distance. It has been conjectured for ferromagnets, and more recently for spin glasses, that, everywhere in the non-extensive regime, the free energy is exactly equal to that for the infinite range model in which the characteristic strength of the interaction is independent of distance. In this paper we present the results of Monte Carlo simulations of the one-dimensional long-range spin glasses in the non-extensive regime. Using finite-size scaling, our results for the transition temperatures are consistent with this prediction. We also propose, and provide numerical evidence for, an analogous result for diluted long-range spin glasses in which the coordination number is finite, namely that the transition temperature throughout the non-extensive regime is equal to that of the infinite-range model known as the Viana-Bray model.Comment: 8 pages; corrected typos, additional background and references relating to FSS correction