Ryogo Kubo is a prominent Japanese physicist known for his significant contributions to statistical mechanics and condensed matter physics. He is best known for developing the Kubo formula, which provides a theoretical framework for calculating linear response functions in statistical mechanics. This formula is widely used in various fields, including physics, chemistry, and materials science, to relate the properties of a system in equilibrium to its behavior out of equilibrium, particularly in response to external perturbations.
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A theoretical physicist who developed a general formulation of linear response theory. His 1957 treatment expresses electrical and magnetic response through the time-dependent correlations of microscopic variables. This connects the response to an applied disturbance with fluctuations already present at equilibrium, giving an atomistic route to quantities such as electrical conductivity and magnetic susceptibility.[ref]
Statistical-Mechanical Theory of Irreversible Processes. I by Ryogo Kubo. Abstract: fluctuation-dissipation theorem, response functions and magnetic and conduction examples