## 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 14 - Linear Response Theory (Part 8) |

Symmetry or antisymmetry of the response function under time-reversal. Spectral function as the real or imaginary part of the susceptibility. Equilibrium averages of equal-time commutators Moments of the spectral function. High-frequency expansion of the susceptibility.

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