New posts in Fourier Transform

Propagator Correction in $\phi^4$ theory - why doesn't this secular growth break perturbation theory?

Why can the Klein-Gordon field be Fourier expanded in terms of ladder operators?

Why are position and momentum space examples of Pontryagin duality?

Why is the momentum-space wavefunction for a free particle not a function of time?

Are there pure sine waves in nature or are they a mathematical construct that helps us understand more complex phenomena?

Reciprocal lattice in 2D

Why is the impedance of a resistor the same in time and frequency domains if the Laplace transform of a constant is not the same constant?

Fourier transform standard practice for physics

What is the physical meaning of a Laplace Transform?

Quantum Field Theory in position space instead of momentum space?