Free space propagator: reconciling two results
67235
Free Particle Path Integral Matsubara Frequency
14203
Finding the creation/annihilation operators
11602
Validity of naively computing the de Broglie wavelength of a macroscopic object
112398
Proof that the effective/proper action is the generating functional of one-particle-irreducible (1PI) correlation functions
94173
Deriving the Lagrangian for a free particle
24975
Weird free spaces estimation
155492
Exercise on local and global symmetry for a given Lagrangian density
107478
Equation of motion of a free particle
16311
Born rule and unitary evolution
77761
Arrow and flow of charge in fermion propagator
60289
How does QFT interpret the Negative probability problem of the real scalar fields' Klein-Gordon equation?
105572
Independent Variables of a Lagrangian
69481
Classical limit of the path integral formulation of quantum mechanics
88125
What can you say about the range space and null space
143157
Perturbation theory: justifying expansion in terms of eigenstates of the basis Hamiltonian
64424
Why does the classical path give the dominant contribution in the path integral?
91090
Trying to understand the idea behind path independence for line integrals