Stability and Instability of Relativistic Fluids in Slowly Expanding Spacetimes

Homogeneous and isotropic solutions to the relativistic Euler equations are known to be unstable on a Minkowski background. However, for FLRW models with a fast expansion rate, relativistic fluids stabilize. This scenario suggests a transition between stable and unstable behavior, somewhere along a family of spacetimes parametrized by their expansion rate. In this talk we will discuss this phase transition for various
equations of state, focusing on the regime of linear and decelerated expansion. This is based on recent analytical results, complemented by
numerical analysis.

via Zoom: https://harvard.zoom.us/j/7855806609