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, … 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?
Huh. I don’t get it. What is a 3D Minkowski spacetime?
In mathematical physics, Minkowski space (or Minkowski spacetime) is a combination of three-dimensional Euclidean space and time into a four-dimensional manifold where the spacetime interval between any two events is independent of the inertial frame of reference in which they are recorded. Although initially developed by mathematician Hermann Minkowski for Maxwell’s equations of electromagnetism, the mathematical structure of Minkowski spacetime was shown to be an immediate consequence of the postulates of special relativity.
Minkowski space is closely associated with Einstein’s theory of special relativity and is the most common mathematical structure on which special relativity is formulated. While the individual components in Euclidean space and time may differ due to length contraction and time dilation, in Minkowski spacetime, all frames of reference will agree on the total distance in spacetime between events.[nb 1] Because it treats time differently than it treats the 3 spatial dimensions, Minkowski space differs from four-dimensional Euclidean space.
In 3-dimensional Euclidean space (e.g., simply space in Galilean relativity), the isometry group (the maps preserving the regular Euclidean distance) is the Euclidean group. It is generated by rotations, reflections and translations. When time is amended as a fourth dimension, the further transformations of translations in time and Galilean boosts are added, and the group of all these transformations is called the Galilean group. All Galilean transformations preserve the 3-dimensional Euclidean distance. This distance is purely spatial. Time differences are separately preserved as well. This changes in the spacetime of special relativity, where space and time are interwoven.
Yeah, I still don’t get it. Perhaps someday I will understand this. I like to read things I don’t understand, then let them soak in.
I guess this is saying some guy came up with a way to model space in a way that it never gets warped by the speed a person is traveling, which happens when you get going closer to the speed of light, according to Einstein.
Perhaps YouTube can help. Here’s something good if you want a brain workout.
While it is true, relativity is not at all obvious. Honestly, it usually makes me want to ignore it. I guess that’s the point of it, relatively speaking.