Brane Universes: String Theory Explained

  • Thread starter Gold Barz
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In summary, string theory, also known as M theory, suggests the existence of a multiverse where our universe is just one of many slices with different dimensions. These slices, or "branes", are part of the Randall Sundrum and AdS/CFT models, which attempt to explain why gravity is weaker than other forces and how string theory and general relativity are related. However, these models are still being researched and do not make any definitive statements about our world.
  • #1
Gold Barz
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Does the string theory really require that our universe is just one slice in gazillions (or infinite?) other slices with different dimensions and such?...whats this theory called?
 
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  • #2
String theory is also know as M theory. A name Witten gave to it after he united the differnt ways to look at it.

Part of M theory is what you described, called a multiverse.

I like the idea of the multiverse because it elimnates paradox's
 
  • #3
are "branes" = universes...i mean do we live in some kind of brane?
 
  • #4
Gold Barz said:
are "branes" = universes...i mean do we live in some kind of brane?

According to several famous versions of stringy physics we do. There is the Randall Sundrum model in which we live in a four dimensional brane that is the boundary or edge of a higher dimensional brane. Some of the puzzles of physics, like why gravity is so much weaker than the other forces, are explained by this model

Another model that has attracted a lot of attention is the AdS/CFT one. AdS stands for anti deSitter space, a simplified version of general relativity. CFT stands for conformal field theory, a kind of string theory. Once again the AdS space is a boundary to the CFT space which is higher dimensional. The "holographic principle" says that all of the physics of the conformal field space is "coded" in the physics of the boundary AdS space. So in a sense here, general relativity drives string theory!

It's important to note that these are research programs, not assertions of fact. String physics does not make any firm, checkable statement of fact about the world we live in.
 
  • #5
What the main consensus about string theory, i think its that branes are basically universes or attached to them or something like that
 

1. What is the concept of brane universes in string theory?

Brane universes are a concept in string theory that proposes the existence of multiple parallel universes, or "branes," that exist alongside our own. These branes can interact with each other through the force of gravity, and may help explain certain phenomena, such as the weakness of gravity compared to other fundamental forces.

2. How does string theory explain the existence of brane universes?

String theory posits that all particles in the universe are actually tiny strings or loops that vibrate at different frequencies. These vibrations give rise to the different properties and forces in our universe. In the concept of brane universes, these strings are confined to a specific brane, while gravity is able to move between branes, allowing for interactions between them.

3. Are there any scientific experiments or evidence to support the existence of brane universes?

Currently, there is no direct evidence or experimental proof of the existence of brane universes. However, some mathematical models and theories within string theory, such as the Randall-Sundrum model, suggest that brane universes may be possible. Further research and experimentation is needed to confirm or refute the existence of brane universes.

4. What implications do brane universes have on our understanding of the universe?

If brane universes do exist, it would greatly expand our understanding of the universe and the laws of physics. It could potentially explain some of the mysteries of our own universe, such as the origin of dark matter and the nature of gravity. It would also have implications for the concept of parallel universes and the possibility of travel between them.

5. How does the concept of brane universes relate to other theories of the universe, such as the Big Bang theory?

The concept of brane universes is an extension of string theory, which is a proposed theory of quantum gravity that seeks to unify all of the fundamental forces of the universe. The Big Bang theory, on the other hand, is a widely accepted theory that explains the beginning and expansion of our universe. While there are potential connections between these theories, they are still being explored and remain theoretical at this time.

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