Thought Experiments


A Journey Into Extra Dimensions

In this video pencast, theorist Delia Schwartz-Perlov explains what physicists are really talking about when they talk about extra dimensions of space. Could our universe actually contain unseen dimensions, and could these extra dimensions help unify quantum theory and gravity?

Extra Dimensions
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Go Deeper
Editor’s picks for further reading

Cosmos: Carl Sagan: The 4th Dimension
In this scene from the classic “Cosmos” series, Carl Sagan imagines what happens when a three-dimensional character enters a two-dimensional world.

FQXi: Taking on String Theory’s 10-D Universe with 8-D Math
In this article, discover how theorists Tevian Dray and Corinne Manogue are using ten-dimensional math to describe subatomic particles.

NOVA: Imagining Other Dimensions
Journey from a two-dimensional “flatland” to the ten- (or more) dimensional world of superstring theory in this illustrated essay.

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Delia Schwartz-Perlov

    Delia Schwartz-Perlov is a Postdoctoral Fellow at the Tufts Institute for Cosmology. She studies cosmology, quantum field theory and general relativity, and has a special interest in the study of inflation, the multiverse and the string theory landscape. When she is not pondering the mysteries of the multiverse, she studies piano, yoga, and art.