According to Brian Greene's book, The Elegant Universe, page 329, "... a three-dimensional sphere inside a Calabi-Yah space can collapse without an ensuring disaster, because a three-brane wrapped around it provides a perfect protective shield." Then on page 324, he writes: "... the three-brane can wrap around and completely cover a three-dimensional sphere. ... a three-brane has three extended dimensions." Then, on his CDs, he ask the question: could our universe be a three-brane?
So, is a three-brane small like the Planck distant or somehow large like our universe? And, what would cause space to rip or tear in the first place?
2007-08-26
13:14:01
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1 answers
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asked by
Bob D1
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