Physical Science Blog

Up And Down Are Big

We don’t usually associate movement with size. Saying that “up” and “down” are big is nonsensical. A dimension is a dimension is a dimension. Right? Wrong – at least, according […]

Olivia Koski• March 10, 2010

We don’t usually associate movement with size. Saying that “up” and “down” are big is nonsensical. A dimension is a dimension is a dimension. Right?

Wrong – at least, according to string theory. The world we can observe is three dimensional, and these dimensions are extended in space. They are big, unlike the hidden dimensions of string theory. Those ones are invisible even to the most powerful particle accelerator on Earth, the Large Hadron Collider.

Extra dimensions are everywhere in space, and they are indeed tiny, according to string theorist Brian Greene in his bookÂ The Elegant Universe. So if you believe string theory, it makes sense to say that the 4th, 5th, 6th, 7th, 8th and 9th dimensions are small, and that left, right, forward, back, and up and down are big.

Even though we can’t see the small dimensions, scientists have the math to describe them, and they can even imagine what they might look like to our 3-D-perceiving eyes. To visualize nine dimensions, string theorists think about six-dimensional entities such as Calabi-Yau shapes. Stack an infinite number of these infinitesimal 6-D figures in a 3-D grid everywhere in space and Voila! You have a 9-D world.

Of course, the ten dimensions of string theory – nine spatial and one temporal – is just an approximation, according to famed theoretical physicistÂ Ed Witten. Alternative string theories predict as many as twenty-six!

To wrap your head around just ten, check out this cool animation.

Olivia Koski

Olivia Koski was born in the desert and raised in the mountains. After studying physics in college, she earned a living manipulating light for an aerospace company. She abandoned saguaros, pine trees and lasers for the skyscrapers of New York City, where she is studying the fine art of manipulating words, sound and images as a journalist. Visit her website at http://www.oliviakoski.com or follow her on Twitter at http://twitter.com/oliviakoski

1 Comment

carl goldson says:

anything with up and down in the title i like =)

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