Time-ordering in QFT
105686
Time-ordered operator in Srednicki
67641
Why should field operators satisfy the classical equations of motion?
83832
Time as a Hermitian operator in quantum mechanics
141561
What does it mean for a QFT to not be well-defined?
21917
Mathematical Prerequisites for QFT
28062
Something special about energy eigenstates when it comes to time evolution?
125215
Deriving Schrodinger equation from Klein-Gordon QFT with the definition $\psi(\textbf{x},t)\equiv \langle 0|\phi_0(\textbf{x},t)|\psi\rangle$
93501
Order of precedence of set operators
140576
Time reversal symmetry and T^2 = -1
59004
Why does time evolution operator have the form $U(t) = e^{-itH}$?
1491
Correct spaces for quantum mechanics
150996
Why path integral approach may suffer from operator ordering problem?
79094
Perturbation expansion with path integrals
38482
What is $\Delta t$ in the time-energy uncertainty principle?
86967
The concept of particle in QFT
11862
Reconstruction of "wavefunction" phases from $|\psi(x)|$ and $|\tilde \psi(p)|$
126425
Consistent, complete, and generalized description of the quantum harmonic oscillator