New posts in Hilbert Space

What are the necessary and sufficient conditions for a wavefunction to be physically possible?

Conceptual question on eigenvectors in quantum mechanics

Quantum expressions involving Dirac delta function

Is the Pusey-Barrett-Rudolph (PBR) theorem only applicable in two dimensions?

Why is the ground state important in condensed matter physics?

In what way are the Hilbert spaces of non-interacting quantum field theories different from each other?

Operator norm and Action

Why do eigenvalues correspond to observable quantities?

What will happen if I multiply a ket vector by a complex number?

What happens when we have $e^{H}$ with $H$ an operator?