Most experiments on condensed matter and cold atom systems measure how an observable changes after perturbing the system. Linear response theory is crucial for interpretation of these experiments, ...

Linear response theory relates the response of a system to a weak external force with its dynamics in equilibrium, subjected to fluctuations. Here, this framework is applied to financial markets; in ...

Certain electromagnetic devices such as differential transformers are effective at translating the displacement of a magnetic armature into an AC voltage, which is a linear function of the ...