Why are there exactly 11 dimensions?

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Discussion Overview

The discussion centers around the question of why there are exactly 11 dimensions in certain theoretical frameworks, particularly M-theory. Participants explore the implications of dimensionality in string theory, the historical context of extra dimensions, and the nature of these dimensions in relation to known physical laws.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • Some participants suggest that the 11 dimensions are a result of M-theory, which combines previous string theories and requires additional dimensions for mathematical consistency.
  • One participant notes that the concept of extra dimensions dates back to Kaluza-Klein theory, which introduced the idea of curled-up dimensions to unify electromagnetism with gravity.
  • Another participant mentions that while 11 dimensions are currently accepted, more dimensions could theoretically exist but are not necessary for current models.
  • There is a discussion about the nature of extra dimensions, with some suggesting they are extremely small and curled up, making them imperceptible in everyday experience.
  • A participant raises questions about the classification of dimensions, proposing that spatial dimensions and time may belong to different categories and inquiring whether objects could exist in some dimensions but not others.
  • Some participants reference alternative theories, such as the Unity Theory and infinite dimension theories, which propose different frameworks for understanding fundamental forces and particles.

Areas of Agreement / Disagreement

Participants express a variety of views on the necessity and nature of extra dimensions, with no consensus reached on whether only 11 dimensions exist or if more could be valid. The discussion remains unresolved regarding the classification and implications of these dimensions.

Contextual Notes

Participants acknowledge that the mathematical framework of string theory is still approximate, and the understanding of dimensions may evolve as further calculations and theories develop.

Who May Find This Useful

This discussion may be of interest to those exploring theoretical physics, particularly in the context of string theory and M-theory, as well as those curious about the implications of dimensionality in physics.

  • #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.
 

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