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Results tagged with condensation
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user 35354
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Quantum fields and condensates
If $\langle 0|\phi (x) |0\rangle = c $, then $\phi $ is related to the quantum field $\Phi $, whose $|0\rangle $ is the vacuum state, by means of $$ \phi (x) = \Phi (x) + cI\:.$$
In other words, $$\ph …
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