# Thread: A dimension higher than 3/4 which can be indirectly seen?

1. If I watch an object, on a parabolic trajectory from the earth, would the force being exerted on the object by gravity be the realization of seeing a dimension higher than 3-4 (4 being light) as this is force is actually a representation of the bending of space into this dimension?

2.

3. Originally Posted by PhDemon
Light being dimension 4. What are you on about.
There is a prevailing view among cosmologists that light is actually a "fallout" from the 4th dimension, mabye the fifth.

Lol, getting my dimensions mixed up.

4. Originally Posted by Devon Keogh
If I watch an object, on a parabolic trajectory from the earth, would the force being exerted on the object by gravity be the realization of seeing a dimension higher than 3-4 (4 being light) as this is force is actually a representation of the bending of space into this dimension?
I have no idea how, or why, you think light is the/ a "4th dimension".
Nor is gravity a dimension, it's a force (or a curvature of spacetime).

5. Originally Posted by Devon Keogh
There is a prevailing view among cosmologists that light is actually a "fallout" from the 4th dimension, mabye the fifth.
Citation needed.

6. Originally Posted by Dywyddyr
Originally Posted by Devon Keogh
If I watch an object, on a parabolic trajectory from the earth, would the force being exerted on the object by gravity be the realization of seeing a dimension higher than 3-4 (4 being light) as this is force is actually a representation of the bending of space into this dimension?
I have no idea how, or why, you think light is the/ a "4th dimension".
Nor is gravity a dimension, it's a force (or a curvature of spacetime).
Gravity is not a dimension, I mean that the curvature of spacetime which makes force is another dimension and gravity represents this.

If you feel that the light as a dimension idea is off-putting, then please ignore it. I dont want it to get in the way of the actual topic.

7. Originally Posted by Devon Keogh
Gravity is not a dimension, I mean that the curvature of spacetime which makes force is another dimension and gravity represents this.
Citation needed.
If you feel that the light as a dimension idea is off-putting, then please ignore it. I dont want it to get in the way of the actual topic.
What is the actual topic then?

8. Originally Posted by Devon Keogh
If I watch an object, on a parabolic trajectory from the earth, would the force being exerted on the object by gravity be the realization of seeing a dimension higher than 3-4 (4 being light) as this is force is actually a representation of the bending of space into this dimension?
Ok, I think you are not really clear on the definition of the term "dimension" - basically and non-technically, the number of dimensions in a space is the minimum amount of information you need to uniquely specify a point. In our universe, you need three coordinates to specify a position ( left-right, front-back, up-down ), as well as a time coordinate to specify an event uniquely. Therefore our universe is 4-dimensional. Forces, light, gravity etc do not come into this at all.

9. Originally Posted by Markus Hanke
Originally Posted by Devon Keogh
If I watch an object, on a parabolic trajectory from the earth, would the force being exerted on the object by gravity be the realization of seeing a dimension higher than 3-4 (4 being light) as this is force is actually a representation of the bending of space into this dimension?
Ok, I think you are not really clear on the definition of the term "dimension" - basically and non-technically, the number of dimensions in a space is the minimum amount of information you need to uniquely specify a point. In our universe, you need three coordinates to specify a position ( left-right, front-back, up-down ), as well as a time coordinate to specify an event uniquely. Therefore our universe is 4-dimensional. Forces, light, gravity etc do not come into this at all.
I am thinking of the curvature of space. Does that curvature not show that there is another specific point of movement?

10. Originally Posted by Devon Keogh
I am thinking of the curvature of space. Does that curvature not show that there is another specific point of movement?
No, a curved 4-dimensional spacetime is still 4-dimensional. You are possibly thinking that the curvature implies that the spacetime is embedded in a higher-dimensional space, but this is not true (i.e. the curvature does not require that it be embedded).

11. A simple-ish way to show that is by imagining a 2D universe like in a video game. You can make that 2D universe curve in such a way that it would look like the surface of a sphere if you tried to show the whole thing at once, but to someone in that universe, it's still just 2D.

12. Originally Posted by Devon Keogh
I am thinking of the curvature of space. Does that curvature not show that there is another specific point of movement?
No - the curvature used to model gravitation is intrinsic curvature, and does not rely on or require any external dimensions or points of reference.

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