New posts in Klein Gordon Equation

Why can you deform the contour in the integral expression for the Klein-Gordon propagator to get the Euclidean propagator?

Deriving Klein-Gordon from Hamilton's equations for fields using functional derivatives

Time-independent Klein-Gordon PDE

Non-Relativistic Limit of Klein-Gordon Probability Density

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

$\phi^{4}$ theory

Quantizing a complex Klein-Gordon Field: Why are there two types of excitations?

How to derive the theory of quantum mechanics from quantum field theory?

Contradictory result for scalar-field propagator from Feynman rules and LSZ formula

Why aren't four-vectors used in the definition of a Klein-Gordon quantum field?