What If the Universe Was Shaped Like a Donut?

The video explores the concept of the universe's shape, focusing on topology rather than geometry. It discusses the possibility of the universe being shaped like a donut, known as a three-torus, which requires a fourth spatial dimension to visualize. The video explains how topology differs from geometry and how astronomers search for patterns to determine the universe's topology. Although recent data suggests the universe is not a donut, the video considers the implications if it were, including challenges to current cosmological theories like inflation.

How do astronomers search for evidence of a three-torus topology in the universe?

What would be the consequence of a donut universe on the observable horizon?

In what way could a donut universe allow for the possibility of seeing oneself in the universe?