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Coloured noise from stochastic inflows in reaction-diffusion systems

Adamer, Michael F., Harrington, Heather A., Gaffnery, Eamonn A. and Woolley, Thomas E. 2020. Coloured noise from stochastic inflows in reaction-diffusion systems. Bulletin of Mathematical Biology 82 , 44. 10.1007/s11538-020-00719-w

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In this paper we present a framework for investigating coloured noise in reaction-diffusion systems. We start by considering a deterministic reaction-diffusion equation and show how external forcing can cause temporally correlated or coloured noise. Here, the main source of external noise is considered to be fluctuations in the parameter values representing the in flow of particles to the system. First, we determine which reaction systems, driven by extrinsic noise, can admit only one steady state, so that effects, such as stochastic switching, are precluded from our analysis. To analyse the steady state behaviour of reaction systems, even if the parameter values are changing, necessitates a parameter-free approach, which has been central to algebraic analysis in chemical reaction network theory. To identify suitable models we use tools from real algebraic geometry that link the network structure to its dynamical properties. We then make a connection to internal noise models and show how power spectral methods can be used to predict stochastically driven patterns in systems with coloured noise. In simple cases we show that the power spectrum of the coloured noise process and the power spectrum of the reaction-diffusion system modelled with white noise multiply to give the power spectrum of the coloured noise reaction-diffusion system.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Mathematics
Subjects: Q Science > QA Mathematics
Publisher: Springer Verlag (Germany)
ISSN: 0092-8240
Date of First Compliant Deposit: 18 February 2020
Date of Acceptance: 6 March 2020
Last Modified: 06 Oct 2021 20:09

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