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The Importance of Symmetry Breaking
The word is fraught. So rather than trying to define it, let me ask how you think about the idea of emergence. And I'm very indebted to Phil Anderson here and Bob Loflin. It's one of those terms that for some reason attracts a lot of bullshitty commentary. For me, broken symmetry is the physical precondition for the possibility of writing uneffective theories. If that effective theory is dynamically sufficient, that is what we mean by emergence. The complex world is full of them. And it's built up from them. That's why I think it's an interesting scientific problem, as opposed to just another inevitable one.