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
13:13:11
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1 answers
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asked by
Bob D1
7
in
Science & Mathematics
➔ Physics
If String/M-theory ... math allows for ... either very, very small ... or very, very large branes, might this suggest some sort of "duality"? Kind of like, if you take a handlens and focus the light from the sun onto the surface of an object, no information is lost. If a sun-spot suddenly occurs on the sun's surface, it will also appear vise the handlens in the focused spot, only greatly reduced in size. It is a kind of duality, the same information in the large reflected in the very small. Maybe something like that happens with branes. After all, the duality between classical physics and quantum mechanics can be observed everywhere in nature, I think.
2007-08-27
01:46:32 ·
update #1