Two particles are entangled if a detection or a manipulation of the quantum state instantaneously affects the other quantum state. Hence, being non-local, the entanglement of two separated particles ...

ABSTRACT Many active galactic nuclei (AGNs) exhibit a highly variable luminosity. Some AGNs also show a pronounced time delay between variations seen in their optical continuum and in their emission ...

The autocorrelation, partial and inverse autocorrelation functions described in the preceding sections help when you want to model a series as a function of its past values and past random errors.