Zobrazeno 11 - 20
of 2 262
pro vyhledávání: '"Kessler, D."'
Publikováno v:
Phys. Rev. X, vol. 4, issue 2, 021036 (2014)
Levy flights are random walks in which the probability distribution of the step sizes is fat-tailed. Levy spatial diffusion has been observed for a collection of ultra-cold Rb atoms and single Mg+ ions in an optical lattice. Using the semiclassical t
Externí odkaz:
http://arxiv.org/abs/1406.1982
Publikováno v:
Phys. Rev. X 4, 011022 (2014)
The Green-Kubo formula relates the spatial diffusion coefficient to the stationary velocity autocorrelation function. We derive a generalization of the Green-Kubo formula valid for systems with long-range or nonstationary correlations for which the s
Externí odkaz:
http://arxiv.org/abs/1310.5405
Publikováno v:
Phys. Rev. E 85, 051124 (2012)
We consider an overdamped Brownian particle moving in a confining asymptotically logarithmic potential, which supports a normalized Boltzmann equilibrium density. We derive analytical expressions for the two-time correlation function and the fluctuat
Externí odkaz:
http://arxiv.org/abs/1202.6250
We investigate the diffusion of particles in an attractive one-dimensional potential that grows logarithmically for large $|x|$ using the Fokker-Planck equation. An eigenfunction expansion shows that the Boltzmann equilibrium density does not fully d
Externí odkaz:
http://arxiv.org/abs/1107.0884
Publikováno v:
Phys. Rev. Lett. 107, 240603 (2011)
We derive a simple formula for the fluctuations of the time average around the thermal mean for overdamped Brownian motion in a binding potential U(x). Using a backward Fokker-Planck equation, introduced by Szabo, et al. in the context of reaction ki
Externí odkaz:
http://arxiv.org/abs/1105.5496
Publikováno v:
Phys. Rev. E 70, 046107 (2004)
We address the velocity fluctuations of fastly moving cracks in stressed materials. One possible mechanism for such fluctuations is the interaction of the main crack with micro cracks (irrespective whether these are existing material defects or they
Externí odkaz:
http://arxiv.org/abs/cond-mat/0403680
Publikováno v:
J. Phys. A 31 (1998) 1189-1209
We study the properties of a noisy time series generated by a continuous-valued feed-forward network in which the next input vector is determined from past output values. Numerical simulations of a perceptron-type network exhibit the expected broaden
Externí odkaz:
http://arxiv.org/abs/cond-mat/9803267