- #1
spaghetti3451
- 1,344
- 33
Why is the partition function
##Z[J]=\int\ \mathcal{D}\phi\ e^{iS[\phi]+i\int\ d^{4}x\ \phi(x)J(x)}##
also called the generating function?
Is the partition function a q-number or a c-number?
Does it make sense to talk of a partition function in classical field theory, or can we define partition functions only in quantum field theories?Is the source ##J## a q-number or a c-number?
##Z[J]=\int\ \mathcal{D}\phi\ e^{iS[\phi]+i\int\ d^{4}x\ \phi(x)J(x)}##
also called the generating function?
Is the partition function a q-number or a c-number?
Does it make sense to talk of a partition function in classical field theory, or can we define partition functions only in quantum field theories?Is the source ##J## a q-number or a c-number?