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Lapidus
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When we talk about the vacuum in qft, what are we referring to? The lowest state vector of the Fock space or the lowest energy field configuration that minimize the Lagrangian?
Also related, when we sandwich the free field between two vacuum states, we get zero plus quantum fluctuations. But the same applies, of course, when we sandwich the lowest field configuration (which is zero) between two vacuum states. So does the vacuum consist of unmeasurable/ unphysical free fields plus fluctuations, or zero field plus fluctuations?thanks in advance for any replies
Also related, when we sandwich the free field between two vacuum states, we get zero plus quantum fluctuations. But the same applies, of course, when we sandwich the lowest field configuration (which is zero) between two vacuum states. So does the vacuum consist of unmeasurable/ unphysical free fields plus fluctuations, or zero field plus fluctuations?thanks in advance for any replies
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