Eigenstate thermalization: Deutsch’s approach and beyond

Reimann P. Eigenstate thermalization: Deutsch’s approach and beyond. New Journal of Physics. 2015;17(5): 055025.The eigenstate thermalization hypothesis postulates that the energy eigenstates of an isolated many-body system are thermal, i.e., each of them already yields practically the same expectation values as the microcanonical ensemble at the same energy. Here, we review, compare, and extend some recent approaches to corroborate this hypothesis and discuss the implications for the system's equilibration and thermalization