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Depending on the way you look at them, there are several kind of kaons: $K^0$ and $\overline{K^0}$ are the kaons produced by strong interaction. They have a definite isospin and strangeness quantum numbers made respectively of $d\bar{s}$ and $\bar{d}s$. However they can oscillate meaning that they transform spontaneously in each other: $K^0 \leftrightarrow ...


I'm going to talk about the Hodge dual in electromagnetism to give you a physical intuition. In electromagnetism the appearance of the Hodge dual field is a mathematical manifestation of electromagnetic duality. Roughly speaking, if some divine being swapped the electric and magnetic fields, fundamental physics wouldn't change. Of course, this statement is ...

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