We study generalized fractional Langevin equations in the presence of a harmonic potential. General expressions for the mean velocity and particle displacement, the mean squared displacement, position and velocity correlation functions, as well as normalized displacement correlation function are derived. We report exact results for the cases of internal and external friction, that is, when the driving noise is either internal and thus the fluctuation-dissipation relation is fulfilled or when the noise is external. The asymptotic behavior of the generalized stochastic oscillator is investigated, and the case of high viscous damping (overdamped limit) is considered. Additional behaviors of the normalized displacement correlation functions different from those for the regular damped harmonic oscillator are observed. In addition, the cases of a constant external force and the force free case are obtained. The validity of the generalized Einstein relation for this process is discussed. The considered fractional generalized Langevin equation may be used to model anomalous diffusive processes including single file-type diffusion.
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February 2014
Research Article|
February 03 2014
Correlation functions for the fractional generalized Langevin equation in the presence of internal and external noise Available to Purchase
Trifce Sandev;
Trifce Sandev
a)
1
Radiation Safety Directorate
, Partizanski odredi 143, P.O. Box 22, 1020 Skopje, Macedonia
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Ralf Metzler;
Ralf Metzler
b)
2Institute for Physics & Astronomy,
University of Potsdam
, D-14776 Potsdam-Golm, Germany
3Department of Physics,
Tampere University of Technology
, FI-33101 Tampere, Finland
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Živorad Tomovski
Živorad Tomovski
c)
4Faculty of Natural Sciences and Mathematics, Institute of Mathematics,
Saints Cyril and Methodius University
, 1000 Skopje, Macedonia
Search for other works by this author on:
Trifce Sandev
1,a)
Ralf Metzler
2,3,b)
Živorad Tomovski
4,c)
1
Radiation Safety Directorate
, Partizanski odredi 143, P.O. Box 22, 1020 Skopje, Macedonia
2Institute for Physics & Astronomy,
University of Potsdam
, D-14776 Potsdam-Golm, Germany
3Department of Physics,
Tampere University of Technology
, FI-33101 Tampere, Finland
4Faculty of Natural Sciences and Mathematics, Institute of Mathematics,
Saints Cyril and Methodius University
, 1000 Skopje, Macedonia
a)
Electronic mail: [email protected]
b)
Electronic mail: [email protected]
c)
Electronic mail: [email protected]
J. Math. Phys. 55, 023301 (2014)
Article history
Received:
April 22 2013
Accepted:
January 14 2014
Citation
Trifce Sandev, Ralf Metzler, Živorad Tomovski; Correlation functions for the fractional generalized Langevin equation in the presence of internal and external noise. J. Math. Phys. 1 February 2014; 55 (2): 023301. https://doi.org/10.1063/1.4863478
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