Correlation functions and dynamical structure factor of a nonisotropic medium near the critical point classical fluid in a gravitational field

A study is made of the analytic properties of the space-time correlation functions of the hydrodynamic fluctuations of the density; these determine the features of the spectrum of critical opalescence of a nonisotropic medium in a gravitational field. The temperature and spatial dependences of the coefficients of the hydrodynamic equations are estimated by means of the results of thermodynamic and dynamic scaling theory.