2025/07/11 by Peter Coles, Coles, Peter, Aoibhinn Gallagher +1 · 1 voice · 1 citation
Chemical Engineering · Mathematics · Physics and Astronomy · #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #Model Reduction and Neural Networks #Numerical methods for differential equations #Rheology and Fluid Dynamics Studies #astro-ph.CO #gr-qc
paper · pdf · doi:10.48550/arxiv.2507.08583
openalex publication_date 2025/07/11 · arxiv published 2025/07/11 · arxiv updated 2025/07/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The Schrödinger-Poisson formalism has found a number of applications in cosmology, particularly in describing the growth by gravitational instability of large-scale structure in a universe dominated by ultra-light scalar particles. Here we investigate the extent to which the behaviour of this and the more general case of a Schrödinger-Newton system, can be described in terms of classical fluid concepts such as viscosity and pressure. We also explore whether such systems can be described by a pseudo-Reynolds number as for classical viscous fluids. The conclusion we reach is that this is indeed possible, but with important restrictions to ensure physical consistency.