Precise numerics versus theory for correlation ratchets.
نویسندگان
چکیده
Fluctuation-induced transport in a correlation ratchet driven by both additive Gaussian white and additive Ornstein-Uhlenbeck (colored) noise is studied numerically and interpreted against theoretical predictions. The current, as well as the current-load curve, exhibits a different behavior depending on the scaling of the colored noise strength. This archetypal correlation ratchet is capable of changing the direction of current (passing through zero at a particular value of noise color) if only the shape of the ratchet potential is chosen appropriately.
منابع مشابه
Gain in stochastic resonance: precise numerics versus linear response theory beyond the two-mode approximation.
In the context of the phenomenon of stochastic resonance (SR), we study the correlation function, the signal-to-noise ratio (SNR), and the ratio of output over input SNR, i.e., the gain, which is associated to the nonlinear response of a bistable system driven by time-periodic forces and white Gaussian noise. These quantifiers for SR are evaluated using the techniques of linear response theory ...
متن کاملKinks in a Stochastic Pde
We consider a stochastic PDE with localized coherent structures known as kinks. The availability of exact results for the steady state and increasing computer power means that precise quantitative comparison between theory and numerics is possible. One of the quantities of interest is the steady-state density of kinks, maintained by a balance between nucleation and annihilation of kink-antikink...
متن کاملTemporally Asymmetric Fluctuations are Sufficient for the Operation of a Correlation Ratchet
A number of recent attempts to understand broad principles of energy transduction in biological systems have focused on correlation ratchets—systems which extract work out of fluctuations which are correlated in time.[1, 2, 3, 4, 5, 6] Correlation ratchets are “information engines” analogous to Maxwell’s Demon, which extract work out of a bath by using information about the system to “choose” only
متن کاملMultiresonance and Enhanced Synchronization in stochastically Coupled Ratchets
We investigate the dynamics and synchronization of two inertia ratchets interacting indirectly through a stochastic dynamical environment. We examine resonant oscillations in their synchronous and asynchronous modes; and we determine the effects of the interaction with the environment on the system’s response and synchronization. We show the occurrence of noiseinduced multi-resonance and noise-...
متن کاملSymmetric white noise can induce directed current in ratchets
Symmetric white noise can induce directed current in periodic potentials that lack reflection symmetry ~termed ratchets!. The requirement for this to occur is that the white noise possesses non-Gaussian statistical properties with all its odd numbered cumulant correlation averages vanishing identically. The fluctuationinduced current is elucidated for three types of white noise: ~i! symmetric w...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Physical review letters
دوره 76 7 شماره
صفحات -
تاریخ انتشار 1996