What Dimensions Are There (in Physics) ?

  • Context: High School 
  • Thread starter Thread starter FeDeX_LaTeX
  • Start date Start date
  • Tags Tags
    Dimensions Physics
Click For Summary

Discussion Overview

The discussion revolves around the concept of dimensions in physics, exploring how many dimensions exist and the interpretations of these dimensions across different theories, including string theory. Participants examine both spatial and temporal dimensions, as well as the implications of higher dimensions in theoretical physics.

Discussion Character

  • Exploratory
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant lists dimensions from 0 to 11 and expresses curiosity about the higher dimensions, indicating a lack of clarity on their definitions.
  • Another participant suggests that the number of dimensions needed to represent a point in space varies and can range from zero to infinite, depending on the context of the physics being discussed.
  • A question is raised about the universality of 0, 1, 2, 3, and 4 dimensions in physics, seeking clarification on whether these are the only universally accepted dimensions.
  • It is noted that the dimensions referred to by the teacher likely pertain to spatial and temporal dimensions.
  • One participant mentions that in the standard model of physics, there are four dimensions, while string theory proposes 10 to 11 dimensions, which are described as an incomplete contender for a theory of everything.
  • Another participant outlines the dimensions predicted by string theory, including spatial dimensions and additional "curled up" dimensions as per Kaluza-Klein theory.

Areas of Agreement / Disagreement

Participants express varying views on the number of dimensions, with some agreeing on the basic dimensions recognized in physics while others introduce the concept of higher dimensions from string theory. The discussion remains unresolved regarding the acceptance and definitions of higher dimensions.

Contextual Notes

There are limitations in the discussion regarding the definitions and implications of higher dimensions, as well as the context in which different dimensions are utilized in various physical theories.

FeDeX_LaTeX
Science Advisor
Messages
436
Reaction score
13
Hello;

I am curious about how many dimensions there are in physics. My physics teacher responded with '10 or 11'.


-1 dimension: ?
0th dimension: Fixed point
1st dimension: Line
2nd dimension: Flat plane
3rd dimension: Object with depth on a flat plane.
4th dimension: 3-dimensional with time
5th dimension: ?
6th dimension: ?
7th dimension: ?
8th dimension: ?
9th dimension: ?
10th dimension: ?
11th dimension: ?

I've tried googling it, but couldn't find any good answers...

Thanks.
 
Physics news on Phys.org
I never thought about negative dimensions!

Anyway, you can think about the number of dimensions as how many numbers you need to represent a point in that space uniquely.

So, for a two dimensional space, to specify a point, I would need two numbers (lets say, x and y). You can probably see how this is generalized.

EDIT: As for answering your question... It depends on the physics you are doing. Physicists use anywhere from zero to infinite dimensions.
 
Okay... so are 0, 1, 2, 3, and 4-dimensional universally accepted by physics? Are those the only dimensions universally accepted?
 
James Leighe said:
EDIT: As for answering your question... It depends on the physics you are doing. Physicists use anywhere from zero to infinite dimensions.

I believe he means spatial/time dimensions
 
Pengwuino said:
I believe he means spatial/time dimensions

In the standard model there are four.

The 10 to 11 dimensions your professor was talking about is from string theory, an (incomplete) contender for the theory of everything.
 
String theory predicts 11 dimensions:

1. Up/Down
2. Forward/Backward
3. Left/Right
4. Time
5-11: Kaluza-Klein "curled up" dimensions.

http://en.wikipedia.org/wiki/Kaluza–Klein_theory

This is the easiest explanation I could find:
https://www.youtube.com/watch?v=lWGb-pIAQ-E
 

Similar threads

  • · Replies 15 ·
Replies
15
Views
3K
  • · Replies 8 ·
Replies
8
Views
3K
  • · Replies 6 ·
Replies
6
Views
4K
  • · Replies 7 ·
Replies
7
Views
3K
  • · Replies 5 ·
Replies
5
Views
5K
  • · Replies 4 ·
Replies
4
Views
4K
  • · Replies 3 ·
Replies
3
Views
4K
  • · Replies 1 ·
Replies
1
Views
3K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 6 ·
Replies
6
Views
7K