We will be glad to welcome Carlo Barenghi (Newcastle University, UK) in Grenoble. During his visit, Prof. Barenghi will give a talk on Monday April 15th.

Announcement on the official webpage of the event.

Vortex reconnections and the topology of turbulence

Abstract

Vortex reconnections and the topology of turbulence Abstract : Reconnections are fundamental events in the motion of fluids and plasmas, as they randomize the field, change the topology and redistribute energy over the length scales. Reconnections events are particularly easy to quantify in quantum fluids (superfluid helium and atomic Bose-Einstein condensates). In these systems the vorticity is not a continuous field (as in air or water) but consists of isolated vortex lines (sort of quantised mini-tornadoes). Individual reconnections happen when two mini-tornadoes collide and exchange heads and tails, as recently observed experimentally. In this talk I shall show that reconnections in quantum fluids obey universal scaling rules, and that the discrete nature of the vorticity opens the way to quantify the complexity of the topology of turbulence.