—Researchers from the University of Maryland and Towson University have created a new type of metamaterial that they describe as looking similar to 3D Minkowski spacetimes. In their paper, which they’ve uploaded to the preprint server arXiv, the researchers explain how the metamaterial can be adjusted to create a demonstration of a multiverse.
Because the exact definition of a universe is difficult to pin down, it’s difficult to say whether the creation of a metamaterial that acts the same as a theoretical universe, is an actual universe if it follows the same rules. And if that metamaterial is capable of demonstrating different types of universes, with unique properties and rules that govern how things behave in them, is it a true multiverse, or simply a simulation of one?
In the case of the metamaterial made by the researchers in Maryland, the answer might lie in the eye of the beholder. They created a solution that had cobalt suspended in kerosene, than applied a magnetic field. Because cobalt is ferromagnetic, the applied field caused the cobalt to line up in columns. But not just ordinary columns, they were mathematically equivalent to a 2+1 Minkowski spacetime. Light passing through the columns has one dimension of time, while light aligned perpendicular to the columns has two dimensions of space. In this configuration, light behaves according to Einstein’s theory of relativity, which means, it might be construed to be its own unique universe, albeit, analogous to the one we perceive around us. But the researchers didn’t stop there, they found that by varying the amount of cobalt in the fluid, they were able to cause different types of columns to form, collapse, and reform, which don’t necessarily conform mathematically to the laws governing our own universe, but do for others, at least in theory.
This meant they had created a metamaterial that was able to look like different universes at different moments over time. And if it looked like them, and acted like them, who’s to say that each wasn’t a unique existence of a true universe? …