The paper Non-linear black hole dynamics and Carrollian fluids, co-authored by PhD student Jaime Redondo-Yuste, was published on February 27, 2023 in the Journal of High Energy Physics.

The study revises the idea that black hole evolution can be understood through a fluid-like entity (in particular, a Carrollian fluid). It numerically evolves the fluid equations for the first time to describe the relaxation of a black hole to equilibrium, revealing that the fluid’s evolution is intricately linked to the black hole’s surface geometry. Moreover, the stability properties of the fluid are tied to the causal nature of the event horizon of the black hole.

The article also suggests that the most non-linear phase of a black hole’s evolution is described as a turbulent regime from the fluid’s perspective. This idea could have important implications for understanding the late stages of black hole mergers and their gravitational wave emission.

The paper is available in Open Access here Non-linear black hole dynamics and Carrollian fluids.