Baths and Quarks: Solitons explained
Why Physics Stack Exchange recommends it
Physics Stack Exchange users link it as a vivid demonstration of solitons and vortex rings in water, both as an example in answers and as a reference point for questions about what the demo shows.
Recommended by 1 people across 1 different months, 2014 to 2020.
What it is
A short Institute of Physics explainer in which theoretical physicist David Tong uses bath-time bubble rings and draining vortices to introduce solitons. He links these solitary waves to the way quarks are bound inside protons.
What people said
Recommends anna v · 2016-06 · Physics Stack Exchange · on “Experimental observation of non-perturbative effects”
It is easy to make solitons in water. See this video [LINK] and the video coming after it with the bubbles. They are the nonlinear solutions [LINK] of the differential equations governing flow.Also I recomend the one with bubbles [this video] . Ball lightning [LINK] is proposed to be a soliton solution.
Cites sunspots · 2014-02 · Physics Stack Exchange · on “Nomenclature clarification concerning solitons”
My experience with solitons is restricted to the classical setting, namely solutions to the quartic interaction $\phi^4$, the Sine-Gordon equation, and Korteweg–de Vries equations. I was explicit to show the boundary on my solitonic knowledge so that I could ask for an interpretation of the recent paper [LINK] In particular I do not understand the difference between solitons and vortex rings. My confusion stems from the introduction to the video Baths and Quarks [this video] . In the intro David Tong is blowing toroidal shaped bubbles, which I thought were examples of solitons. A phenomena which dolphins exhibit for play. However, in the watered down discussion of the aforementioned paper [LINK]
Cites user242231 · 2020-01 · Physics Stack Exchange · on “An interesting observation: Ordered, up and down movement of vortex rings in water”
I was watching a video on David Tong's research work when I stumbled upon a peculiar movement of vortex rings in water. Around the 1:20 time mark, Baths and Quarks: Solitons explained [this video] , David Tong uses an air-pump to create vortex rings in water. What I've observed was that the vortex rings go up and down in an ordered sequence (observe the attached pictures). [LINK] [LINK] [LINK] As you can see from the attached pictures, the first vortex ring went down, the second one went up, the third one went down and the fourth one went up. How can we quantitatively express this phenomenon? How can we mathematically understand this effect? Why and how does the inclination of the initial vortex