Confinement effects on the stimulated dissociation of molecular BECs

We show that a molecular BEC in a trap is stabilized against stimulated dissociation if the trap size is smaller than the resonance healing length $(\hbar^2/2mg\sqrt{n})^{1/2}$. The condensate shape determines the critical atom-molecule coupling frequency. We discuss an experiment for triggering dissociation by a sudden change of coupling or trap parameters. This effect demonstrates one of the unique collective features of 'superchemistry' in that the yield of a chemical reaction depends critically on the size and shape of the reaction vessel.Comment: 4 pages, 4 figure

Hospitality, Culture and Regeneration: Urban decay, entrepreneurship and the "ruin" bars of Budapest

This paper considers the relationships between hospitality, culture and urban regeneration through an examination of rom (ruin) venues, which operate in dilapidated buildings in Budapest, Hungary. The paper reviews previous work on culture and urban regeneration in order to locate the role of hospitality within emerging debates. It subsequently interrogates the evolution of the rom phenomenon and demonstrates how, in this context, hospitality thrives because of social and physical decay in urban locations, how operators and entrepreneurs exploit conflicts among various actors involved in regeneration, and how hospitality may be mobilised purposefully in the regeneration process. The paper demonstrates how networked entrepreneurship maintains these operations and how various forms of cultural production are entangled and mobilised in the venues’ hospitality propositions

Revealing the mechanism and function underlying pairwise temporal coupling in collective motion

Abstract Coordinated motion in animal groups has predominantly been studied with a focus on spatial interactions, such as how individuals position and orient themselves relative to one another. Temporal aspects have, by contrast, received much less attention. Here, by studying pairwise interactions in juvenile zebrafish (Danio rerio)—including using immersive volumetric virtual reality (VR) with which we can directly test models of social interactions in situ—we reveal that there exists a rhythmic out-of-phase (i.e., an alternating) temporal coordination dynamic. We find that reciprocal (bi-directional) feedback is both necessary and sufficient to explain this emergent coupling. Beyond a mechanistic understanding, we find, both from VR experiments and analysis of freely swimming pairs, that temporal coordination considerably improves spatial responsiveness, such as to changes in the direction of motion of a partner. Our findings highlight the synergistic role of spatial and temporal coupling in facilitating effective communication between individuals on the move

Kollektives Verhalten im Fußball

Fußball wird mit zwei Mannschaften gespielt, wobei die Spieler direkt, indirekt und gleichzeitig interagieren, um ein Ziel zu erreichen, das das Erzielen von Toren beinhaltet, während gleichzeitig verhindert wird, dass der Gegner ein Tor schießt (Gréhaigne et al., 1997; Zaccaro et al., 2001). In diesem Sinne setzt sich der Fußball aus Individuen zusammen, die ihre Bewegungen koordinieren und kooperative Beziehungen entwickeln, um dem Gegner überlegen zu sein (Duarte et al., 2012).publishe