Carrollian

Carrollian refers to a concept in theoretical physics related to a specific way of understanding spacetime symmetries when speed of light approaches zero. It's part of a framework called "Carrollian physics," which contrasts with the more familiar "relativistic" physics where the speed of light is finite. In a Carrollian universe, objects and signals cannot move, leading to a different kind of physics where time remains meaningful, but spatial movement essentially halts. This idea helps scientists explore extreme limits of physics, such as near black holes or in early universe scenarios, providing insights into the fundamental nature of spacetime.