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Results tagged with field-theory
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user 231036
For questions where the dynamical variables are fields, that is, functions of several variables (typically, one time coordinate and several space coordinates). Comprises both classical field theory and quantum field theory. Use this tag when the question applies to both classical and quantum phenomena. Otherwise, use the specific tag instead.
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Electromagnetic linear response theory in function integral language [closed]
I'm being confused with the discussion in Altland&Simons' textbook, page P391-392. How is eq(7.46) derived? Specificly, Here we have the action:
$$S[\bar{\psi},\psi,A]=\int dx \bar{\psi_\sigma}\left( …
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Srednicki chapter 22: continuous symmetries and conserved current
In Srednicki's book he says that:
The Noether current plays a special role if we can find a set of infinitesimal field transformations that leaves the lagrangian unchanged, or invariant. In this …
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