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If spontaneous symmetry breaking only occurs in infinite systems, why do we observe similar effects in finite systems?
Background
No SSB in finite systems
Consider a system interacting with a heat bath at inverse temperature $\beta$, with the resultant dynamics of the system described by a Liouvillian superoperator $...
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How to rigorously argue that the superposition state is unstable in spontaneously symmetry breaking case
In quantum mechanics, the definition of symmetry breaking is nontrivial. See What is spontaneous symmetry breaking in QUANTUM systems?
Let me briefly summarize that question:
In spin-$1/2$ quantum ...
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