Stabilizing relativistic fluids on spacetimes with non-accelerated expansion

We establish global regularity and stability for the irrotational relativistic Euler equations with equation of state $\bar{p}=K\bar{\rho }$, where $0<K<1\mathrm{/}3$, for small initial data in the expanding direction of FLRW spacetimes of the form $(\mathbb R\times\mathbb T^3,-d\tb^2+\tb^2\delta_{ij} dx^i dx^j)$. This provides the first case of non-dust fluid stabilization by spacetime expansion where the expansion rate is of power law type but non-accelerated. In particular, the time integral of the inverse scale factor diverges as $t\to \mathrm{\infty }$.