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 · 1 answers · asked by Bob D1 7 in Science & Mathematics ➔ Astronomy & Space
Hi. I do not have your answer but found a good discussion forum for the general subject. http://forum.physorg.com/index.php?showtopic=537
2007-08-26 13:31:40 · answer #1 · answered by Cirric 7 · 0⤊ 0⤋