Does String Theory tell us the size of Extra Dimensions.

In summary, the conversation discusses the relationship between string theory and the size of extra dimensions. It is noted that there are various models with different types of extra dimensions, such as Calabi-Yau and branes. There is also mention of an ADD model with large extra dimensions. While there is some discussion on the topic, there is no clear answer and the complexities of the question are brought to light.
  • #1
hankaaron
83
4
Does the math in string theory tell us anything about the size of any of the extra dimensions?
 
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  • #2
no so much.

for one thing there are many models with varying 'extra dimensions'...sometimes
Calabi-Yau [which I think are small, 'compactified'] and other times branes [bigger] and sometimes a mix...Then there is an ADD model with large extra dimensions.

Some discussion on extra dimensions here:

http://en.wikipedia.org/wiki/String_theory#Extra_dimensionsedit: a discussion with some background...no precise answer...here:

https://www.physicsforums.com/showthread.php?t=421326

This discussion brings out some of the complexities in addressing your question
 
Last edited:
  • #3
To a first approximation, string theory in its current form tells us nothing. Instead, you tell it what you want.
 

1. What is String Theory?

String Theory is a theoretical framework in physics that attempts to explain the fundamental forces and particles in the universe by viewing them as tiny, vibrating strings rather than point-like particles.

2. How many dimensions does String Theory propose?

String Theory proposes that there are 10 dimensions in total - 3 spatial dimensions (length, width, and height) and 1 dimension of time, as well as 6 extra dimensions that are curled up and hidden from our perception.

3. Can we observe these extra dimensions?

No, we cannot directly observe these extra dimensions as they are thought to be curled up and extremely small, on the order of 10^-33 centimeters. However, their effects may be observed through experiments and observations of the universe.

4. Does String Theory tell us the exact size of these extra dimensions?

No, String Theory does not provide a specific size for these extra dimensions. The size is considered to be on a subatomic scale and can vary depending on the specific version of the theory.

5. How does the size of these extra dimensions affect our understanding of the universe?

The size of these extra dimensions can greatly impact our understanding of the universe, as it may help explain the behavior of particles and the forces that govern them. It also has implications for theories such as gravity and the concept of a unified theory of physics.

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