Annotation
Exact relationships are derived by the Gibbs' method for calculating the fluctuations and correlations of quantum systems. A fluctuation-dissipation theorem is obtained without using perturbation theory. The re sults are used to calculate the mean square displacement of Brownian motion.
© 2016 Publisher M.V.Lomonosov Moscow State University
Authors
Nguen Tang
Department of Theoretical Physics
Department of Theoretical Physics
Science News of the Faculty of Physics, Lomonosov Moscow State University
This new information publication, which is intended to convey to the staff, students and graduate students, faculty colleagues and partners of the main achievements of scientists and scientific information on the events in the life of university physicists.