کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
974491 | 1480125 | 2016 | 9 صفحه PDF | دانلود رایگان |
• A stochastic process is generated through the path integral with a classical action.
• The transition probability per step is expressed as a perturbation series.
• Moment-generating function is expressed as a perturbation series.
The transition probability PVPV for a stochastic process generated by a conservative Lagrangian L=L0−εVL=L0−εV is obtained at first order from a perturbation series found using a path integral. This PVPV corresponds to the transition probability for a random walk with a probability density given by the sum of a normal distribution and a perturbation which may be understood as the contribution of the interaction of the random walk with the external field. It is also found that the moment-generating function for PVPV can be expressed as the generating function of a normal distribution modified by a perturbation. Applications of these results to a linear potential, a harmonic oscillator potential, and an exponentially decaying potential are shown.
Journal: Physica A: Statistical Mechanics and its Applications - Volume 448, 15 April 2016, Pages 1–9