Thomas-Fermi ground state of dipolar fermions in a circular storage ring

Recent developments in the field of ultracold gases has led to the production of degenerate samples of polar molecules. These have large static electric-dipole moments, which in turn causes the molecules to interact strongly. We investigate the interaction of polar particles in waveguide geometries subject to an applied polarizing field. For circular waveguides, tilting the direction of the polarizing field creates a periodic inhomogeneity of the interparticle interaction. We explore the consequences of geometry and interaction for stability of the ground state within the Thomas-Fermi model. Certain combinations of tilt angles and interaction strengths are found to preclude the existence of a stable Thomas-Fermi ground state. The system is shown to exhibit different behavior for quasi-one-dimensional and three-dimensional trapping geometries.

Upplysning och gränsdragning : en filosofisociologisk studie av den första generationen analytiska filosofer i Sverige

Enlightenment and boundary work: a study of the first-generation Swedish analytical philosophers from a sociology-of-philosophy perspective The history of Swedish analytical philosophy begins with the writings of Ingemar Hedenius, Anders Wedberg, and Konrad Marc-Wogau, who introduced the country to a new style of thinking that was to become the dominant mode of academic philosophizing in it from the mid-1940s to the late 1960s. The article presents a sociological analysis of how that hegemonic position was claimed and established for it in Swedish philosophy departments. In particular, the critique that Hedenius, Wedberg, and Marc-Wogau levelled in their popular writings against continental philosophy is looked upon in detail. Drawing upon Thomas Gieryn’s theory of boundary work, it is shown how the three strove for epistemic authority by demarcating their own ‘scientific’ enterprise from the ‘unscientific’ philosophy of their competitors. This quest for authority, however, was pursued not solely for its own sake: Hedenius, Wedberg, and Marc-Wogau were also all firmly committed to the ideals of enlightenment and cultural radicalism shaping the Swedish society of their time.