## Nonequilibrium Statistical Mechanics

Nonequilibrium Statistical Mechanics. Instructor: Professor V. Balakrishnan, Department of Physics, IIT Madras. Thermal fluctuations, Langevin dynamics, Brownian motion and diffusion, Fokker-Planck equations, linear response theory, fluctuation-dissipation relations, the Boltzmann equation, critical phenomena, scaling and critical exponents.
(from **nptel.ac.in**)

Lecture 11 - Linear Response (Part 6) |

Dispersion relations for the real and imaginary parts of the susceptibility. Asymptotic behaviour of the susceptibility and subtracted dispersion relations. Case of a singular DC susceptibility. Response function in terms of matrix elements of observables. Susceptibility in terms of transition frequencies.

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