Thermodynamic fluctuations of electromagnetic field in slightly absorbing media
Authors: B.A.Veklenko (Institute for High Temperatures RAS, 127412 Moscow, Russia),
Y.B.Sherkunov (Institute of Thermal Physics of Extremal States of Associated Institute for High Temperatures RAS, 127412 Moscow, Russia)
A theory of thermodynamic fluctuations of electromagnetic field in slightly absorbing media is developed using the quantum electrodynamics - method of $\Gamma$-operators - without phenomenology. The hypothesis offered by Yury L. Klimontovich is under consideration. The necessity of correct consideration of photon-photon correlation functions is shown. The results are compared with the ones obtained with the help of standard theory based upon fluctuation-dissipation theorem (FDT). The latter results are shown to have no field of application at least for the case of thermally excited media of the atoms described with two-level model.
Key words: thermodynamic fluctuations, fluctuation-dissipation
theorem, correlation function, electromagnetic field in slightly
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