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19
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1answer
1k views

Emergent symmetries

As we know, spontaneous symmetry breaking(SSB) is a very important concept in physics. Loosely speaking, zero temprature SSB says that the Hamiltonian of a quantum system has some symmetry, but the ...
7
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0answers
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Is the “particle number” of “electrons” well defined in Wen's string-net theory of elementary particles?

According to professor Wen's string-net theory, electrons can be viewed as the elementary excitations of string-net objects. Just like the phonons and magnons are the elementary excitations of ...
4
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1answer
553 views

A simple model that exhibits emergent symmetry?

In a previous question Emergent symmetries I asked, Prof.LuboŇ° Motl said that emergent symmetries are never exact. But I wonder whether the following example is an counterexample that has exact ...