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To be exact, the researchers created a metamaterial — like those used to fashion invisibility cloaks — that, when light passes through it, multiple universes are formed within it. These universes, called Minkowski spacetimes, are similar to our own, except they more neatly tie up Einstein’s theory of special relativity by including time as a fourth dimension.
The Einstein-Minkowski Spacetime
The characteristic feature of Galileo's Spacetime was the set of horizontal slices representing "planes of simultaneity". On a given plane, all of its events are simultaneous.
This is the notion of Absolute Time, in which all observers agree on the elapsed-time between two given events. In the particular case of "zero elapsed-time", all observers agree that the events on a given horizontal plane are simultaneous.
Einstein's extension of the Principle of Relativity to all physical laws requires us to abandon Galileo's Spacetime---in particular, its universal "planes of simultaneity"---that is, the notion of Absolute Time. In its place, we have the Einstein-Minkowski Spacetime.
The set of events that are simultaneous to one observer are not simultaneous to another observer!
Originally posted by teslahowitzer
And as a theory, as relavent time, our 10,000 years could only be a few months in this theorettical lab. I wonder if a nano ship could travel into this new multiverse someday?