New posts in Unitarity

The Information Paradox and the Copenhagen Interpretation

What are the theoretical / mathematical problems in discarding negative solutions of Dirac equation?

Are all representations of a finite group unitary?

Does anything guarantee that a field theory will have a lower bound on energy, so that a vacuum exists?

QFT perturbation theory

Why is the information paradox restricted to black holes?

Why are symmetry transformations connected to the identity necessarily represented by linear unitary operators?

Lorentz transformations for spinors

Matrix for $\pi/2$ pulse?

Why do negative norm states break unitarity?