Universe May Contain “Tardis-like” Regions of Spacetime, say Cosmologists — The Physics arXiv Blog — Medium: ...the entire accelerated expansion thing could be an optical illusion created by regions of space that are bigger on the inside than they look on the outside...
Lavinto and co then calculated what our Universe would look like if it contained Tardis regions. It turns out that as the universe expands, the volume of Tardis regions grows more quickly and this makes it look as if the expansion of the entire universe is accelerating.
...Tardis regions would look like parts of the universe that are particularly low density. If that sounds familiar, it’s because astronomers can actually see that our universe is filled with regions called voids that look just like this. These are parts of the universe that have far fewer galaxies than other parts of the cosmos.
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