query: Why do we use Fourier transforms in QFT?
positive_passages.docid: 17120
positive_passages.text: Why use Fourier expansion in Quantum Field Theory?
negative_passages.docid: 149895
negative_passages.text: A more convenient Fourier series
negative_passages.docid: 13137
negative_passages.text: Why are Hermitian operators linked to observables?
negative_passages.docid: 70281
negative_passages.text: Why does non-commutativity in quantum mechanics require us to use Hilbert spaces?
negative_passages.docid: 9477
negative_passages.text: Dft to evaluate Fourier coefficients
negative_passages.docid: 100985
negative_passages.text: Effect of linear terms on a QFT
negative_passages.docid: 90325
negative_passages.text: Why use the derivative and not the symmetric derivative?
negative_passages.docid: 146067
negative_passages.text: Creating intuition about Laplace & Fourier transforms
negative_passages.docid: 155046
negative_passages.text: How does QFT help with entanglement?
negative_passages.docid: 120474
negative_passages.text: Does the lagrangian contain all the information about the representations of the fields in QFT?
negative_passages.docid: 106841
negative_passages.text: Meaning of complex Fourier transformation function
negative_passages.docid: 148888
negative_passages.text: How does the inverse transform method work?
negative_passages.docid: 67261
negative_passages.text: How does a perturbation theory make sense in quantum field theory?
negative_passages.docid: 100975
negative_passages.text: Dirac Delta function inverse Fourier transform
negative_passages.docid: 86967
negative_passages.text: The concept of particle in QFT
negative_passages.docid: 72322
negative_passages.text: Why is the harmonic oscillator so important?
negative_passages.docid: 24694
negative_passages.text: Why does a fourier series have a 1/2 in front of the a_0 coefficient