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Exact cumulant Kramers–Moyal-like expansion

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  • Morgado, W.A.M.

Abstract

We derive an exact equation, a Cumulant Kramers–Moyal Equation (CKME), quite similar to the Kramers–Moyal Equation (KME), for the probability distribution of a Markovian dynamical system. It can be applied to any well behaved (converging cumulants) continuous time systems, such as Langevin equations or other models. An interesting but significant difference with respect to the KME is that their jump-moments are proportional to cumulants of the dynamical variables, but not proportional to central moments, as is the case for the KME. In fact, they still obey a weaker version of Pawula’s theorem, namely Marcinkiewicz’s theorem. We compare the results derived from the equations herein with the ones obtained by computing via Gaussian and biased, and unbiased, Poisson Langevin dynamics and a Poisson non-Langevin model. We obtain the exact CKME time-evolution equation for the systems, and in several cases, those are distinct from the Fokker–Planck equation or the KME.

Suggested Citation

  • Morgado, W.A.M., 2015. "Exact cumulant Kramers–Moyal-like expansion," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 438(C), pages 493-508.
    • Handle: RePEc:eee:phsmap:v:438:y:2015:i:c:p:493-508
    DOI: 10.1016/j.physa.2015.07.012
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    References listed on IDEAS

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    1. Morgado, Welles A.M. & Guerreiro, Thiago, 2012. "A study on the action of non-Gaussian noise on a Brownian particle," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 391(15), pages 3816-3827.
    2. Van Kampen, N.G. & Oppenheim, I., 1986. "Brownian motion as a problem of eliminating fast variables," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 138(1), pages 231-248.
    3. Soares-Pinto, D.O. & Morgado, W.A.M., 2006. "Brownian dynamics, time-averaging and colored noise," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 365(2), pages 289-299.
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    More about this item

    Keywords

    Kramers–Moyal Equation; Cumulants;

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