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Fluctuation-dissipation dispersion relation for systems with slowly varying parameters

par Belyi, Viatcheslav
Référence AIP Conference Proceedings, 780, page (63-66)
Publication Publié, 2005-08

Article révisé par les pairs

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Résumé :

A generalization of the fluctuation-dissipation formula for systems with slowly varying parameters is given using the Langevin approach and momentum method. It is shown that spectral function of the fluctuations in these systems is determined not only by the dissipation but also by the derivations of the dispersion. The non Joule dispersion contribution is characterized by a new nonlocal effect originating from an additional phase shift between the force and response of the system. That phase shift results from the parametric control to the system. The general formalism is illustrated for an oscillating electrical circuit. It is shown that in that systems the dispersive contributions strongly affect the quality factor. © 2005 American Institute of Physics.