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Classical concepts in the theory of dynamical systems, like integrability, periodicity, and chaos, were observed to have quantum analogues, which is reflected in the difference of spectral properties. Although the statement is well-grounded in evidence, we are lacking verifications to a large extent ...

We study signatures of quantum chaos in $(1+1)D$ quantum field theory (QFT) models. Our analysis is based on the method of Hamiltonian truncation, a numerical approach for the construction of low-energy spectra and eigenstates of QFTs that can be considered as perturbations of exactly solvable model ...

The validity of the ergodic hypothesis in quantum systems can be rephrased in the form of the eigenstate thermalization hypothesis (ETH), a set of statistical properties for the matrix elements of local observables in energy eigenstates, which is expected to hold in any ergodic system. We test the E ...