Why are there exactly 11 dimensions?

  • Context: Graduate 
  • Thread starter Thread starter stamba
  • Start date Start date
  • Tags Tags
    Dimensions
Click For Summary
SUMMARY

The discussion centers on the necessity of 11 dimensions in M-theory, as proposed by Ed Witten, which unifies five previously distinct string theories. The mathematical framework of string theory requires additional dimensions to accommodate the vibrational properties of strings, leading to the conclusion that 11 dimensions are essential for consistency. The conversation also touches on the historical context of higher dimensions, referencing Kaluza-Klein theory and the concept of Calabi-Yau manifolds, which describe the shapes of compactified dimensions. Participants express skepticism about the existence of more than four dimensions, emphasizing the need for empirical evidence.

PREREQUISITES
  • Understanding of M-theory and its implications in theoretical physics
  • Familiarity with string theory and its dimensional requirements
  • Knowledge of Kaluza-Klein theory and its historical significance
  • Basic grasp of Calabi-Yau manifolds and their role in compactification
NEXT STEPS
  • Research the mathematical foundations of M-theory and its dimensional constraints
  • Explore the implications of Calabi-Yau manifolds in string theory
  • Investigate the historical development of higher-dimensional theories, focusing on Kaluza-Klein theory
  • Examine current experimental efforts to detect extra dimensions in particle physics
USEFUL FOR

The discussion is beneficial for theoretical physicists, students of advanced physics, and anyone interested in the complexities of string theory and the nature of dimensions in the universe.

  • #61
DaveC426913 said:
It is a hypothesis. No one is suggesting there is evidence that there is more than one universe. The MWI is another such hypothesis.

But is it reasonable to accept that every sub atomic interaction divides reality such that every possibility did occur? I'd suggest that all our evidence suggests that once a decision is made, it's final.

It's just that in the macro world, the decision is made Very quickly. Decoherence seems to me to be exponentialy related to the plank length, and yet there is an almost quantum nature to the border where the decisions get made - in effect - instantly.

And yet the uncertainty remains in the macro world because firstly there are too many variables for us to be capable of making sense of their interactions, and secondly because at some fundamental level our consciousness lives in the place where quantum uncertainty is normal.

I'm not suggesting
anything like indecision etc. I'm proposing that human will is non deterministic. And I'm certainly not suggesting that consciousness and quantum uncertainty are directly connected. But it is a fact that we are a long way from starting to understand either.

I feel sorry for all the people that have no intellectual curiosity because they believe people far more intelligent than themselves are close to understanding everything. It's cruel that science nowadays is constructed to give that false impression, when the reality would stir and exite so many more to hunger to understand the great mysteries that stand before us all.

If science was more honest about the fact that most of it's current "facts" will be at least partially modified in a decade or two, the crazies that reject reason altogether would have the rug taken from under their feet. And maybe more would hunger for truth.
 

Similar threads

Replies
20
Views
2K
  • · Replies 2 ·
Replies
2
Views
5K
  • · Replies 4 ·
Replies
4
Views
3K
  • · Replies 13 ·
Replies
13
Views
4K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 5 ·
Replies
5
Views
4K
  • · Replies 19 ·
Replies
19
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 2 ·
Replies
2
Views
6K