Why did the other dimensions stay small in M-theory?

In summary: These solutions describe a space that is "warped" in a way that could explain gravity. In summary, M-theory states that there are 11 dimensions, with 4 dimensions being the ones we live in and the other 7 being incredibly small. It is believed that these dimensions remained small during the Big Bang in order for our universe to exist and function properly. Lisa Randall's work suggests that larger dimensions may be possible, but there is currently no evidence to support this. Additionally, there is no known "center" of the universe. The reason why these dimensions remained small is because they are a type of solution in relativity that could explain gravity.
  • #1
cansay27
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From what I have gathered, M-theory states that there are 11 dimensions. We live in 4 of these dimensions, and I believe the common understanding is that the 7 other dimensions are incredibly small. At the time of the Big Bang, these 3 dimensions expanded along with the universe while the others remained small.

My question is this: Why did these other dimensions remain small? Also, if these dimensions had never expanded, does this mean that they would be found at the "center" of the universe?
 
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  • #2
No one knows IF the other dimensions really exist and no one knows why they remained curled up tightly. One hypothesis is that our universe would be unstable if some or all of the extra dimensions were large...planets could not form, elements would not be produced, and so we would not exist. Such extra small dimensions apparently weaken gravity so our universe can "exist"..larger rolled up dimensions might weaken gravity further...

Lisa Randall has done some theoretical work suggesting that branes make much larger dimensions than previously envisioned possible...or maybe it was the ADD model...maybe even a millimeter in size...no evidence yet that I have read...

We have a LOT more theoretical mathematical models than "real" worlds...just because the math appears to work doesn't mean it has already done so...maybe tomorrow!

PS: There is no "center" of the universe...as far as we know...
 
  • #3
cansay27 said:
My question is this: Why did these other dimensions remain small?

Because they are some variant of a kind of solutions of relativity called "Freund-Robin" solutions.
 

1. What are the 11 dimensions of space-time?

The 11 dimensions of space-time are the three dimensions of space (length, width, and height) and the one dimension of time that we experience in our everyday lives, along with seven additional dimensions that are theorized to exist in the universe.

2. How do we know about the existence of these extra dimensions?

Scientists have developed several theories, such as string theory and M-theory, to explain the existence of these extra dimensions. These theories are based on mathematical equations and observations of the universe.

3. Can we physically perceive these extra dimensions?

No, we cannot physically perceive these extra dimensions because they are believed to be curled up or compactified at a microscopic level. This means that they are too small for us to detect with our current technology and understanding of the universe.

4. What is the significance of these extra dimensions?

These extra dimensions play a crucial role in the understanding of the fundamental laws of physics and the structure of the universe. They also help explain phenomena such as gravity and the behavior of subatomic particles.

5. Are there any practical applications of understanding 11 dimensions of space-time?

While the full understanding and utilization of these extra dimensions is still a topic of ongoing research, some scientists believe that it could potentially lead to advancements in areas such as quantum computing and space travel. However, more research is needed to fully understand and harness the power of these dimensions.

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