A research team led by Yves Couder at the Université Paris Diderot recently discovered that it's possible to make a tiny fluid droplet levitate on the surface of a vibrating bath, walking or bouncing across, propelled by its own wave field. Surprisingly, these walking droplets exhibit certain features previously thought to be exclusive to the microscopic quantum realm.
A droplet of silicone oil bounces in place on a vibrating fluid bath.
Credit: Dan Harris and John Bush/MIT
This finding of quantum-like behavior inspired another team of researchers, at the Massachusetts Institute of Technology (MIT), to examine the dynamics of these walking droplets. They describe their findings in the journal Physics of Fluids."This walking droplet system represents the first realization of a pilot-wave system. Its great charm is that it can be achieved with a tabletop experiment and that the walking droplets are plainly visible," explained John Bush, professor of applied mathematics in the Department of Mathematics at MIT. "In addition to being a rich, subtle dynamical system worthy of interest in its own right, it gives us the first opportunity to view pilot-wave dynamics in action."
"Of course, if we ever hope to establish a link with quantum dynamics, it's important to first understand the subtleties of this fluid system," said Bush. "Our recent article is the culmination of work spearheaded by my graduate student, Jan Molacek, who developed a theoretical model to describe the dynamics of bouncing and walking droplets by answering questions such as: Which droplets can bounce? Which can walk? In what manner do they walk and bounce? When they walk, how fast do they go?"
In the team's article, Molacek's theoretical developments were compared to the results of a careful series of experiments performed by Øistein Wind-Willassen, a graduate student visiting from the Danish Technical University, on an experimental rig designed by Bush's graduate student, Dan Harris.
"Molacek's work also led to a trajectory equation for walking droplets, which is currently being explored by my graduate student Anand Oza," Bush said. "Our next step is to use this equation to better understand the emergence of quantization and wave-like statistics, both hallmarks of quantum mechanics, in this hydrodynamic pilot-wave system."
The researchers will now seek and explore new quantum analogs, with the ultimate goal of understanding the potential and limitations of this walking-droplet system as a quantum analog system.
The paper, "Exotic states of bouncing and walking droplets," authored by Øistein Wind-Willassen, Jan Molacek, Daniel M. Harris, and John W. Bush, appears in the journal Physics of Fluids. See: http://dx.doi.org/10.1063/1.4817612
ABOUT THE JOURNAL
Physics of Fluids is devoted to the publication of original theoretical, computational, and experimental contributions to the dynamics of gases, liquids, and complex or multiphase fluids. See: http://pof.aip.org
Jason Socrates Bardi | EurekAlert!
Ultra-compact phase modulators based on graphene plasmons
27.06.2017 | ICFO-The Institute of Photonic Sciences
Smooth propagation of spin waves using gold
26.06.2017 | Toyohashi University of Technology
An international team of scientists has proposed a new multi-disciplinary approach in which an array of new technologies will allow us to map biodiversity and the risks that wildlife is facing at the scale of whole landscapes. The findings are published in Nature Ecology and Evolution. This international research is led by the Kunming Institute of Zoology from China, University of East Anglia, University of Leicester and the Leibniz Institute for Zoo and Wildlife Research.
Using a combination of satellite and ground data, the team proposes that it is now possible to map biodiversity with an accuracy that has not been previously...
Heatwaves in the Arctic, longer periods of vegetation in Europe, severe floods in West Africa – starting in 2021, scientists want to explore the emissions of the greenhouse gas methane with the German-French satellite MERLIN. This is made possible by a new robust laser system of the Fraunhofer Institute for Laser Technology ILT in Aachen, which achieves unprecedented measurement accuracy.
Methane is primarily the result of the decomposition of organic matter. The gas has a 25 times greater warming potential than carbon dioxide, but is not as...
Hydrogen is regarded as the energy source of the future: It is produced with solar power and can be used to generate heat and electricity in fuel cells. Empa researchers have now succeeded in decoding the movement of hydrogen ions in crystals – a key step towards more efficient energy conversion in the hydrogen industry of tomorrow.
As charge carriers, electrons and ions play the leading role in electrochemical energy storage devices and converters such as batteries and fuel cells. Proton...
Scientists from the Excellence Cluster Universe at the Ludwig-Maximilians-Universität Munich have establised "Cosmowebportal", a unique data centre for cosmological simulations located at the Leibniz Supercomputing Centre (LRZ) of the Bavarian Academy of Sciences. The complete results of a series of large hydrodynamical cosmological simulations are available, with data volumes typically exceeding several hundred terabytes. Scientists worldwide can interactively explore these complex simulations via a web interface and directly access the results.
With current telescopes, scientists can observe our Universe’s galaxies and galaxy clusters and their distribution along an invisible cosmic web. From the...
Temperature measurements possible even on the smallest scale / Molecular ruby for use in material sciences, biology, and medicine
Chemists at Johannes Gutenberg University Mainz (JGU) in cooperation with researchers of the German Federal Institute for Materials Research and Testing (BAM)...
19.06.2017 | Event News
13.06.2017 | Event News
13.06.2017 | Event News
27.06.2017 | Power and Electrical Engineering
27.06.2017 | Information Technology
27.06.2017 | Physics and Astronomy