Approximating Families of Sharp Solutions to Fisher's Equation with Physics-Informed Neural Networks

• URL: http://arxiv.org/abs/2402.08313v1
• Date: Tue, 13 Feb 2024 09:17:20 GMT
• Title: Approximating Families of Sharp Solutions to Fisher's Equation with Physics-Informed Neural Networks
• Authors: Franz M. Rohrhofer, Stefan Posch, Clemens G\"o{\ss}nitzer, Bernhard C. Geiger
• Abstract summary: This paper employs physics-informed neural networks (PINNs) to solve Fisher's equation. A residual weighting scheme is introduced to address optimization challenges associated with the standard PINN approach. A specific network architecture is studied which is tailored for solutions in the form of traveling waves.
• Score: 9.271640666465364
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: This paper employs physics-informed neural networks (PINNs) to solve Fisher's equation, a fundamental representation of a reaction-diffusion system with both simplicity and significance. The focus lies specifically in investigating Fisher's equation under conditions of large reaction rate coefficients, wherein solutions manifest as traveling waves, posing a challenge for numerical methods due to the occurring steepness of the wave front. To address optimization challenges associated with the standard PINN approach, a residual weighting scheme is introduced. This scheme is designed to enhance the tracking of propagating wave fronts by considering the reaction term in the reaction-diffusion equation. Furthermore, a specific network architecture is studied which is tailored for solutions in the form of traveling waves. Lastly, the capacity of PINNs to approximate an entire family of solutions is assessed by incorporating the reaction rate coefficient as an additional input to the network architecture. This modification enables the approximation of the solution across a broad and continuous range of reaction rate coefficients, thus solving a class of reaction-diffusion systems using a single PINN instance.

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