# Reaction-diffusion with stochastic decay rates

Source: [Reaction-diffusion with stochastic decay rates](<https://www.sota2.com/research/paper/68fa36911e209131ce8aaee2>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-24T21:54:10.681Z

Authors: Gerald J. Lapeyre Jr., Marco Dentz

Published: 2016-03-15T16:33:03.000Z

## Abstract

Understanding anomalous transport and reaction kinetics due to microscopic physical and chemical disorder is a long-standing goal in many fields including geophysics, biology, and engineering. We consider reaction-diffusion characterized by fluctuations in both transitions times and decay rates. We introduce and analyze a model framework that explicitly connects microscopic fluctuations with the mescoscopic description. For broad distributions of transport and reaction time scales we compute the particle density and derive the equations governing its evolution, finding power-law decay of the survival probability, and spatially heterogeneous decay that leads to subdiffusion and an asymptotically stationary surviving-particle density. These anomalies are clearly attributable to non-Markovian effects that couple transport and chemical properties in both reaction and diffusion terms.

## Recorded benchmark results

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/1603.04753>)

[PDF](<https://arxiv.org/pdf/1603.04753.pdf>)