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arXiv 2202.01655math.PRmath-phmath.APmath.FAmath.MPquant-ph
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广义时间分数阶发展方程的从属原理和Feynman-Kac公式

Subordination principle and Feynman-Kac formulae for generalized time-fractional evolution equations

Christian Bender, Marie Bormann, Yana A. Butko

摘要:

本文考虑形式为$$u(t)=u_0+\int_0^tk(t,s)Lu(s)ds$$的广义时间分数阶发展方程,它具有相当一般的记忆核$k$和一个算子$L$是强连续半群的生成元.特别地,$L$可以是某个状态空间$Q$上的马尔可夫过程$ξ$的生成元$L_0$,或者是用于合适的潜在$V$和漂移$b$的$L:=L_0+b\nabla+V$,或者是生成从属半群或薛定谔型群的$L$。这类发展方程特别包括时间和空间分数热和薛定谔型方程。我们表明,从属原则持有这样的发展方程,并获得Feynman-Kac公式的解决方案,这些方程与使用不同的随机过程,如从属马尔可夫过程和随机尺度高斯过程。特别地,我们得到了广义灰布朗运动和其他相关的平稳增量自相似过程的Feynman-Kac公式。

英文摘要:

We consider generalized time-fractional evolution equations of the form $$u(t)=u_0+\int_0^tk(t,s)Lu(s)ds$$ with a fairly general memory kernel $k$ and an operator $L$ being the generator of a strongly continuous semigroup. In particular, $L$ may be the generator $L_0$ of a Markov process $ξ$ on some state space $Q$, or $L:=L_0+b\nabla+V$ for a suitable potential $V$ and drift $b$, or $L$ generating subordinate semigroups or Schrödinger type groups. This class of evolution equations includes in particular time- and space- fractional heat and Schrödinger type equations. We show that a subordination principle holds for such evolution equations and obtain Feynman-Kac formulae for solutions of these equations with the use of different stochastic processes, such as subordinate Markov processes and randomly scaled Gaussian processes. In particular, we obtain some Feynman-Kac formulae with generalized grey Brownian motion and other related self-similar processes with stationary increments.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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