What this quantum field operator represents $ b_{in}(t) = \frac{1}{\sqrt{2 \pi}} \int e^{-i \omega t} b(\omega)$?
51392
What does it mean to Fourier transform a ladder operator (in the input-output formalism)?
98417
Recovering QM from QFT
32606
Is the operator $T((x_1,x_2,...,x_n))=(x_1,\frac{x_2}2,\frac{x_3}3,...)$ on $\ell^2$ self-adjoint and unitary
71105
How is Grover's operator represented as a rotation matrix?
45061
Physical interpretation of $Q^i = \partial _\nu T^{i \nu}$
45559
Why we use $L_2$ Space In QM?
124703
Where does the $i$ come from in the Schrödinger equation?
1043
Image of $L=\{z\in\Bbb C \mid a\operatorname{Re}(z)+b\operatorname{Im}(z)+c=0; a^2+b^2\neq0; a,b,c\in \Bbb R \}$ under the function $e^z$
131016
Question about Klein-Gordon field Lagrangian
38103
A No-Nonsense Introduction to Quantum Field Theory
71599
How to prove useful property of logarithm of generating functional in QFT?
42531
Calculating commutators in quantum mechanics symbolically with the help of Mathematica
94896
Deriving a QM expectation value for a square of momentum $\langle p^2 \rangle$
121584
Rigor in quantum field theory
36152
Bessel function representation of spacelike KG propagator
63304
The Dirac-delta function as an initial state for the quantum free particle
138832
Expansion coefficients of an arbitrary state in the Hilbert space of one-particle states