SOUND EMISSION AND IRREVERSIBLE DYNAMICS DURING VORTEX - PowerPoint PPT Presentation

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arXiv:2005.02047, arXiv.2005.02048 SOUND EMISSION AND IRREVERSIBLE DYNAMICS DURING VORTEX RECONNECTIONS IN QUANTUM FLUIDS DAVIDE PROMENT, UNIVERSITY OF EAST ANGLIA (UK) Joint work with: Alberto Villois and Giorgio Krstulovic arXiv:2005.02047,

arXiv:2005.02047, arXiv.2005.02048 SOUND EMISSION AND IRREVERSIBLE DYNAMICS DURING VORTEX RECONNECTIONS IN QUANTUM FLUIDS DAVIDE PROMENT, UNIVERSITY OF EAST ANGLIA (UK) Joint work with: Alberto Villois and Giorgio Krstulovic
arXiv:2005.02047, arXiv.2005.02048 SOUND EMISSION AND IRREVERSIBLE DYNAMICS DURING VORTEX RECONNECTIONS IN QUANTUM FLUIDS ‣ Introduction on quantum fluids (superfluids) ‣ What are vortex reconnections? ‣ Evidence of irreversible dynamics ‣ Matching theory to explain this behaviour
WHAT IS A QUANTUM FLUID (SUPERFLUID)? Mathematically (fluid mechanics) ‣ Total absence of viscosity ‣ Irrotational flow, but vortices exist as topological defects ‣ Vorticity is delta-supported and circulation is quantised (take only multiple values of the quantum of circulation Physically (quantum mechanics, statistical mechanics, condensed matter) ‣ Quantum fluids manifest at very low temperatures or at very high density ‣ Superfluidity is related to Bose-Einstein condensation ‣ Emergence of an order parameter that describes the system
EXAMPLES OF QUANTUM FLUIDS Bose-Einstein condensates [top: JILA group, bottom: Ketterle et al.] Superfluid liquid helium [Public Domain, Wikipedia] Neutron stars [Robert Schulze, Wikipedia]

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