Path integrals and degrees of freedom in many-body systems and relativistic field theories |
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Authors: | F Palumbo |
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Institution: | (1) INFN, Laboratori Nazionali di Frascati, Italy |
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Abstract: | The identification of physical degrees of freedom is sometimes obscured in the path-integral formalism, and this makes it difficult to impose some constraints or to do some approximations. I review a number of cases where the difficulty is overcome by deriving the path integral from the operator form of the partition function after such identification has been made. |
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