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- W4367181111 abstract "Abstract We derive, through subordination techniques, a generalized Feynman–Kac equation in the form of a time fractional Schrödinger equation. We relate such equation to a functional which we name the subordinated local time. We demonstrate through a stochastic treatment how this generalized Feynman–Kac equation describes subdiffusive processes with reactions. In this interpretation, the subordinated local time represents the number of times a specific spatial point is reached, with the amount of time spent there being immaterial. This distinction provides a practical advance due to the potential long waiting time nature of subdiffusive processes. The subordinated local time is used to formulate a probabilistic understanding of subdiffusion with reactions, leading to the well known radiation boundary condition. We demonstrate the equivalence between the generalized Feynman–Kac equation with a reflecting boundary and the fractional diffusion equation with a radiation boundary. We solve the former and find the first-reaction probability density in analytic form in the time domain, in terms of the Wright function. We are also able to find the survival probability and subordinated local time density analytically. These results are validated by stochastic simulations that use the subordinated local time description of subdiffusion in the presence of reactions." @default.
- W4367181111 created "2023-04-28" @default.
- W4367181111 creator A5006059364 @default.
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- W4367181111 date "2023-04-27" @default.
- W4367181111 modified "2023-10-14" @default.
- W4367181111 title "Subdiffusion in the Presence of Reactive Boundaries: A Generalized Feynman–Kac Approach" @default.
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- W4367181111 doi "https://doi.org/10.1007/s10955-023-03105-7" @default.
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- W4367181111 hasPublicationYear "2023" @default.
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