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Spontaneous emergence of a spin state for an emitter in a time-varying medium

Posted by heligone on Jun 9, 2022 in Bibliography, Blog, Core Bibliography | 0 comments

dpin

Is it possible for a free particle to spontaneously start spinning around a point without anything in the center of its path? The answer is yes.

Researchers at the Langevin Institute have just shown that a drop bouncing on a vertically vibrating liquid bath could remain captive to the waves it emitted during these successive bounces on the bath’s surface (see video). As in a kind of wave ballet, the drops first become walkers, propelled on the surface of the bath by the waves they emitted during their previous bounces. Then, spontaneously, they start to turn according to well-defined orbits, maintained in this perpetual movement by their past waves. It is in a way a “wave memory” that maintains them. The spontaneous emergence of a “spin” originates from the presence of a time-varying medium, the vibrating bath, which allows the emitted waves to be turned back in time and refocused on the source that initially produced them. Time-varying media are fascinating because they allow a source to be given a spatio-temporal non-locality, or more simply, to be clothed with a constantly changing past that determines its future.

Bernard-Bernardet, S., Fleury, M., & Fort, E. (2022). Spontaneous emergence of a spin state for an emitter in a time-varying medium. The European Physical Journal Plus, 137(4), 1-8.

EmQm17

Posted by heligone on Oct 22, 2017 in Blog | 2 comments

See you in London next week ??

🙂


Influence of memory on trajectory in a harmonic potential

Posted by heligone on Jan 22, 2017 in Blog | 0 comments

These are trajectories of a dotwave in a central harmonic potential

Both trajectories have same parameters, only the memory of the bath differs.

 

Memory = 5

HarmonicWithMemory5 (Large)Memory = 50


HarmonicWithMemory50 (Large)

New reference website from Paris Couder & Fort Team

Posted by heligone on Oct 7, 2016 in Blog, On the web | 0 comments

The Paris team led by Yves Couder & Emmanuel Fort has published online a wonderful reference website, with many new videos

http://dualwalkers.com/

emergence of statistical pattern in a 1D cavity

Posted by heligone on Aug 5, 2016 in Blog, Original videos, Videos | 0 comments

On this video you will see how a walking droplet in a small 1D cavity moves “randomly” if the memory of the system is high enough (ie if the forcing is strong enough, but still below the Faraday Thresold)

And how a statistical pattern emerges with time

 

Rainbow colored dotwave

Posted by heligone on May 22, 2016 in Blog, Original Photos, Photos | 0 comments

These pictures illustrate path memory : in the wake of the drop, there is a superposition of a circular wave due to latest impact and of “line waves”  created by the many previous bounces

dotwave03 dotwave02 dotwave01

Dotwave picture on Phys.org

Posted by heligone on May 22, 2016 in Blog, Original Photos, Photos | 0 comments

 

 

 

 

Russian Physicians from Moscow Institute of Physics and Technology have chosen a dotwave.org picture to illustrate an article published on phys.org concerning their latest paper,

Des physiciens russes de l’institut de physique et de technologie de Moscou ont choisi une de mes photos pour illustrer un rĂ©sumĂ© d’un de leur papier sur les ondes de Faraday publiĂ© sur phys.org

 

 

phys.org

Physics Today : letters to the editor

Posted by heligone on Apr 11, 2016 in Blog, On the web | 3 comments

Some (heated ?) exchanges on the april edition of Physics today … with answers from John BUSH

Physics Today April 2016

Emergent quantization in a square box

Posted by heligone on Apr 5, 2016 in Blog, Original Photos, Original videos, Photos, Slider, Videos | 11 comments

Goal of the experiment :

A walking droplet is placed in a square box, at the onset of Faraday thresold.

The trajectory of the droplet is mapped.
In the long time limit, does a self-interference pattern appear ? what’s its shape ? How does it relate to the square cavity surface wave eigen-modes ?

cf. experiment by Bush et al. : in a circular corral
http://dotwave.org/wavelike-statistics-from-pilot-wave-dynamics-in-a-circular-corral/

wavelike Statistics

In short, we try to reproduce the experiment of Bush et al, but in a square box.

SuiviCarreProgramme

First result :

A walking droplet in a square cavity shows random motion, but with time, its trajectory is building a statistic reminiscent of the resonant mode of the cavity.

This can be seen by the naked eye in this movie excerpt :

This is then confirmed with optical tracking measurment of the trajectory :

trajectoire

Trajectory of the walking droplet

The position distribution (~probability density) is then computed :

densité2

Probabilty density

 

PDF Version of this résumé :

Emergent quantization of trajectories in a square box

 

Mini Colloque RNL 2016 : DualitĂ© onde-corpuscule Ă  l’échelle macroscopique

Posted by heligone on Mar 15, 2016 in Blog | 5 comments

I was lucky enough to attend this mini-colloque !!

“Si la dualitĂ© onde-corpuscule est une des bases de l’interprĂ©tation de la mĂ©canique quantique, elle peut aussi se manifester Ă  l’échelle macroscopique. Durant ce mini-colloque seront prĂ©sentĂ©es les propriĂ©tĂ©s observĂ©es dans des systĂšmes macroscopiques, ainsi que quelques-unes de leurs pendants aux Ă©chelles microscopiques. Un des objectifs est d’identifier les analogies et les diffĂ©rences entre ces deux types de systĂšmes.”
Rencontre du non-linéaire 2016

 

http://nonlineaire.univ-lille1.fr/SNL/media/2016/programme/ProgrammeMiniColloque2016.pdf

DotWave Keynote at XLIM Lab in Limoges

Posted by heligone on Jun 19, 2015 in Blog | 6 comments

 

A live demonstration with a brief theoretical introduction to walking droplets and their wonders was held successfully at XLIM labs in Limoges last week.

50 attendees, mainly professionnal researchers in the field of photonics and microwave and their PhD student.

 

flyer_Limoges

lim3 lim2 lim1

 

“Fingers and Holes in a Shaken Cornstrach Solution” sur YouTube

Posted by heligone on Aug 17, 2014 in Blog | 0 comments

Quasi particles in the middle of faraday waves :

Fingers and Holes in a Shaken Cornstrach Solution : http://youtu.be/DrcShENMaoI

Birth of a dotwave (Un rebond peut en cacher un autre)

Posted by heligone on Aug 3, 2014 in Blog, Featured, Original videos, Slider, Videos | 5 comments

 

forcing@60Hz

cam@240Hz

Video Lesson – 07/06/2013 – Hydrodynamic Modelling of Pilot-Wave and boucing droplet coupling in a Faraday Problem

Posted by heligone on Jul 21, 2014 in Blog, On the web, Videos | 0 comments

“Recent experiments by two groups, Yves Couder (Paris) and John 
Bush (MIT) have shown experimentally that droplets will bounce on the 
surface of a vertically vibrated bath (instead of coalescing with it), 
generating a Faraday-type wavefield at every bounce. From this state, a 
pitchfork symmetry breaking bifurcation leads to a “walking” state whereby 
the bouncing droplet is “guided” by the self-generated wavefield – the 
droplet’s pilot wave. Once this state is achieved a large array of 
interesting dynamics ensues with surprising analogies to quantum 
mechanical behaviour. We will present a coupled particle-fluid model that 
can can be used simulate the dynamics of this problem. This is joint work 
with John Bush, Andre Nachbin (IMPA) and Carlos Galeano (IMPA)”

Bouncing droplet project — single-slit diffraction

Posted by heligone on Jul 21, 2014 in Blog, Videos | 0 comments

A video from TAFLAB at Berkeley University

 

 

 

SPH Simulation of a walking droplet

Posted by heligone on Jul 20, 2014 in Blog, Numerical Simulation, Videos | Comments Off on SPH Simulation of a walking droplet

A new kind of simulation using Smoothed particle hydrodynamics by Diego Molteni, UniversitĂ  degli studi di Palermo, Dipartimento di Fisica e Chimic

Vortex-mediated bouncing drops on an oscillating liquid

Posted by heligone on Jul 20, 2014 in Bibliography, Blog, Core Bibliography, Photos | 0 comments

Chu, H. Y., & Fei, H. T. (2014). Vortex-mediated bouncing drops on an oscillating liquid. Physical Review E, 89(6), 063011

 http://journals.aps.org/pre/abstract/10.1103/PhysRevE.89.063011 (Subsrciption required)

Stunning Vizualisization of undersurface flows

 

Abstract :

We have investigated the behavior of bouncing drops on a liquid surface by using particle image velocimetry analysis. A drop on an oscillating liquid surface is observed to not coalesce with the liquid and to travel along the surface if the oscillation is strong enough. A streaming vortex pair, induced by the alternatively distorted liquid surface, shows up below a bouncing drop. The time-averaged flow fields of the vortices are measured. In our quasi-one-dimensional setup, there are three stable distances for the drops, which can be characterized by the Faraday wavelength. The interactions of the vortex-mediated bouncing drops are deduced from the streamlines in the liquid bulk. We further show that a three-dimensional vortex ring is induced by a bouncing drop in a square cell.

 

vortex3

 

 

vortex2 Vortex1

 

 

Dotwave @ 240 frame per Seconds with modified GoPro

Posted by heligone on Jul 20, 2014 in Blog, Featured, Original videos, Videos | 1 comment

This is how precise my temporal resolution can be with my modified goPro and (at last) a good lens : 240 fps ( @848×480 )

Forcing freq is 60 Hz, so Faraday Freq is 30Hz, so for the usual walking mode we have 8 frame during the period of the vertical dynamic. Hence we can observe the dynamic without any strobe effect.

Question: What is the (m, n) mode of the first droplet shown in the movie ?

 

Uneven Faraday Instability

Posted by heligone on Jul 10, 2014 in Blog, Original Photos, Photos | 0 comments

Faraday instability in a a square container not very well tuned : it has 4 quadrants :
– upper left : a crystal-like pattern
– upper right and lower left : linear pattern
– lower left : below faraday thresold (with a droplet)

 

Faraday Instability

Dotwave Sonification

Posted by heligone on Jul 3, 2014 in Blog, Featured, Numerical Simulation, Original videos, Videos | 4 comments

Even if the ear cannot detect any transition on this one, it might give somebody … ideas ?

( Sound is the derivative of the sum of all field values at the center )

 

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a random video

Other Research teams

  • Austrian Institute for Nonlinear Studies (AINS) – Gerhard Groessing
  • Berkeley University – TAF LAB
  • Caltech Mc Keon Research Group
  • Instituto Nacional de MatemĂĄtica Pura e Aplicada – Andre Nachbin and Carlos Galeano
  • MIT – John BUSH
  • St. Petersburg Nuclear Physics Institute – Dr. Valeriy Sbitnev
  • UniversitĂ  degli Studi di Palermo – Pr. Diego Molteni –
  • UniversitĂ© de LiĂšge – Quandrops
  • UniversitĂ© Paris Diderot – Yves Couder
  • University of Bath – PAUL MILEWSKI
  • University of Cambridge – Computer Laboratory – Dr Robert Brady

Liens

  • MatiĂšre vivante : excellente analyse de tomroud
  • Pedro J. SÁENZ / MIT
  • UniversitĂ© de Nice – Projet Goutte

Recent Posts

  • Spontaneous emergence of a spin state for an emitter in a time-varying medium June 9, 2022
  • Spin Lattice of walking droplets June 20, 2018
  • Statistical projection effects in a hydrodynamic pilot-wave system June 19, 2018
  • Quantum physics Dropwise June 18, 2018
  • EmQm17 October 22, 2017
  • Walking droplet above cavities October 17, 2017
  • Faraday wave droplet dynamics : discret time analysis October 17, 2017
  • Tunneling with a hydrodynamic pilot-wave model October 17, 2017
  • Walking droplets in linear channels October 17, 2017
  • Self-propulsion and crossing statistics under random initial conditions October 17, 2017
  • A trajectory equation for walking droplets : hydrodynamic pilot-wave theory October 17, 2017
  • Influence of memory on trajectory in a harmonic potential January 22, 2017
  • A model for Faraday pilot waves over variable topography January 22, 2017
  • Non-specular reflection of walking droplets January 22, 2017
  • Self-attraction into spinning eigenstates of a mobile wave source by its emission back-reaction January 22, 2017
  • Onset of chaos in orbital pilot-wave dynamics January 15, 2017
  • Surface topography measurements of the bouncing droplet experiment December 4, 2016
  • Momentum exchange in the electron double-slit experiment November 29, 2016
  • Double-slit experiment with single wave-driven particles and its relation to quantum mechanics October 12, 2016
  • New reference website from Paris Couder & Fort Team October 7, 2016
  • Shedding light on pilot-wave phenomena September 17, 2016
  • Neimark–Sacker bifurcation and evidence of chaos in a discrete dynamical model of walkers September 17, 2016
  • Wave-Based Turing Machine: Time Reversal and Information Erasing September 17, 2016
  • Transition Orbits of Walking Droplets August 15, 2016
  • emergence of statistical pattern in a 1D cavity August 5, 2016
  • Quantumlike statistics of deterministic waveparticle interactions in a circular cavity July 13, 2016
  • Retro-influence of a square cavity on a circular standing wave May 22, 2016
  • Square cavity May 22, 2016
  • Rainbow colored dotwave May 22, 2016
  • Dotwave picture on Phys.org May 22, 2016
  • Faraday wave lattice as an elastic metamaterial May 22, 2016
  • Scattering theory of walking droplets in the presence of obstacles May 22, 2016
  • Nonlinear Generation of Vorticity by Surface Waves May 21, 2016
  • Pilot-wave dynamics in a harmonic potential : Quantization and stability of circular orbits May 2, 2016
  • Physics Today : letters to the editor April 11, 2016
  • Faraday pilot wave dynamics : modelling and computation April 10, 2016
  • Dynamics and statistics of wave-particle interactions in a confined geometry April 10, 2016
  • Displacement of an Electrically Charged Drop on a Vibrating Bath April 10, 2016
  • Emergent quantization in a square box April 5, 2016
  • Mini Colloque RNL 2016 : DualitĂ© onde-corpuscule Ă  l’échelle macroscopique March 15, 2016
  • Smoothed Particles Hydrodynamics numerical simulations of droplets walking on viscous vibrating fluid January 25, 2016
  • Revisiting time reversal and holography with spacetime transformations. October 12, 2015
  • Waveguides for walking droplets October 12, 2015
  • Pilot-Wave Hydrodynamics (Annual Review of Fluid Mechanics 2015) September 26, 2015
  • On the analogy of quantum wave-particle duality with bouncing droplets September 26, 2015
  • Strings of droplets propelled by coherent waves September 26, 2015
  • Interaction of two walkers: Wave-mediated energy and force September 26, 2015
  • Build-up of macroscopic eigenstates in a memory-based constrained system September 25, 2015
  • Parametrically excited water surface ripples as ensembles of oscillons September 24, 2015
  • DotWave Keynote at XLIM Lab in Limoges June 19, 2015
  • Une mĂ©moire ondulatoire : États propres, Chaos et ProbabilitĂ©s June 12, 2015
  • The wave-induced added mass of walking droplets May 12, 2015
  • Generating uniaxial vibration with an electrodynamic shaker and external air bearing May 12, 2015
  • A low‑cost, precise piezoelectric droplet‑on‑demand generator May 12, 2015
  • Chaos Driven by Interfering Memory May 12, 2015
  • Étude d’une dynamique Ă  mĂ©moire de chemin: une expĂ©rimentation thĂ©orique May 12, 2015
  • “Fingers and Holes in a Shaken Cornstrach Solution” sur YouTube August 17, 2014
  • Birth of a dotwave (Un rebond peut en cacher un autre) August 3, 2014
  • Video Lesson – 07/06/2013 – Hydrodynamic Modelling of Pilot-Wave and boucing droplet coupling in a Faraday Problem July 21, 2014
  • Bouncing droplet project — single-slit diffraction July 21, 2014

Recent Comments

  • sam on A low‑cost, precise piezoelectric droplet‑on‑demand generator
  • jitendra on A low‑cost, precise piezoelectric droplet‑on‑demand generator
  • jitendra on A low‑cost, precise piezoelectric droplet‑on‑demand generator
  • yeptube on Statistical projection effects in a hydrodynamic pilot-wave system
  • sam on “Tunnel effect “
  • Carlos on “Tunnel effect “
  • yonglip on Particle in a box – DotWave Self-Interference tracking and statistics
  • guest on bouncing droplets
  • sam on EmQm17
  • Paul Bancroft on EmQm17

Recent Posts

  • Spontaneous emergence of a spin state for an emitter in a time-varying medium
  • Spin Lattice of walking droplets
  • Statistical projection effects in a hydrodynamic pilot-wave system
  • Quantum physics Dropwise
  • EmQm17
  • Walking droplet above cavities
  • Faraday wave droplet dynamics : discret time analysis
  • Tunneling with a hydrodynamic pilot-wave model
  • Walking droplets in linear channels
  • Self-propulsion and crossing statistics under random initial conditions
  • A trajectory equation for walking droplets : hydrodynamic pilot-wave theory
  • Influence of memory on trajectory in a harmonic potential
  • A model for Faraday pilot waves over variable topography
  • Non-specular reflection of walking droplets
  • Self-attraction into spinning eigenstates of a mobile wave source by its emission back-reaction

Random Video

auto-orbit with half ghost dipole

auto orbit

Stay informed !

Other Research teams

  • Austrian Institute for Nonlinear Studies (AINS) – Gerhard Groessing
  • Berkeley University – TAF LAB
  • Caltech Mc Keon Research Group
  • Instituto Nacional de MatemĂĄtica Pura e Aplicada – Andre Nachbin and Carlos Galeano
  • MIT – John BUSH
  • St. Petersburg Nuclear Physics Institute – Dr. Valeriy Sbitnev
  • UniversitĂ  degli Studi di Palermo – Pr. Diego Molteni –
  • UniversitĂ© de LiĂšge – Quandrops
  • UniversitĂ© Paris Diderot – Yves Couder
  • University of Bath – PAUL MILEWSKI
  • University of Cambridge – Computer Laboratory – Dr Robert Brady

Liens

  • MatiĂšre vivante : excellente analyse de tomroud
  • Pedro J. SÁENZ / MIT
  • UniversitĂ© de Nice – Projet Goutte

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Authors

Andersen A. Anderson R. Bach R. Bastin T. Batelaan H. Boudaoud A. Brady R. Brun P. T. Bush J. W. Couder Y. Cristea-Platon T. Decelle A. Dorbolo S. Eddi A. Ellegaard C. Faria L. M. Filoux B. Fort E. Galeano Rios C. Gautier C. H Gilet T. Harris D. M. Hubert M. Labousse M. Lautrup B. Lieber S. I. Madsen J. Martin J. Milewsky P. Moisy F. Molteni D. Moláček J. Moukhtar J. Nachbin A. Oza A. U. Perrard S. Protiùre S. Pucci G. Reichelt C. Rosales R. R. Saenz P. J. Schlagheck P. Terwagne D. Vandewalle N. Wind-Willassen Ø.

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