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Questions tagged [spacetime-dimensions]

Use this tag for dimensions of a manifold, typically the space-time. DO NOT USE THIS TAG for dimension of a physical quantity nor for the size of an object.

Use this tag for dimensions of a manifold, typically the . DO NOT USE THIS TAG for dimension of a physical quantity nor for the size of an object: In the former case use the tag instead.

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Could negative dimension ever make sense?

After some quick check I found that negative dimensions are not used. But we have negative probability, negative energy etc. So is it so likely that we won't ever use negative dimension(s) ? Update I understand there're also dimensions that are not…
Niklas Rosencrantz
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If I squeeze something really hard, will it ever become two-dimensional?

A mosquito just wanted to bite me! Päng - and it stuck to my hand, hardly recognisable anymore. I said to my girlfriend: "Just reduced the dimension of the mosquito by one!" Therefore the question: If I squeeze a three-dimensional body really hard,…
dani
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What is the minimum number of co-ordinates used to perfectly describe the shape,orientation and position of an n-dimensional object?

What is the minimum number of co-ordinates used to perfectly describe the shape,orientation and position of a n-dimensional object? How do I make an approach to this problem? I am confused with the shape and orientation. How many dimensions do we…
SN77
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How can some theories claim the existence of higher dimensions?

Note: The following question is probably demonstrating a complete misunderstanding of higher dimensions. I am by no means an expert in string theory and higher dimensions. I'm a 7th grader who recently wanted to learn about the 4th dimension. I…
Nico A
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Have we proven that higher dimensions exist?

Have we proven higher dimensions exist?
George Kyriakou
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What's the meaning of dimensionality?

I got amazed with this answer and as you can see, I had a little talk with joriki. He suggested me some examples such as the 2DEG. I'm stuck with some aspects on dimensionality, see this line: A two-dimensional electron gas (2DEG) is a gas of…
Red Banana
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Circle becomes Sphere in 3d?

I was watching a movie Interstellar when it came out. Its been months but now I cant keep it inside and I must ask this question. So a guy was talking about wormhole in movie and ask the other guy whats a circle in 3d and other guy said, a Sphere.…
xmen
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Describing Objects in the First Dimension

The "third" dimension is the one we experience day-to-day. An example of the "second" dimension is the shadow of a three-dimensional object. How do we describe the "first" dimension? What would be an example of matter in the first dimension?
math and mountains
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Could we see a lower dimension within our universe?

My question refers to the fact, that, say if our universe were to be sitting on a 4 (spatial) dimensional plane, that we cannot see, then within our universe could there be a point mass in which 1 or 2 (spatial) dimensions could exist. We may not be…
user28956
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Can you affect higher dimensions from lower ones?

To make it easier to explain, I'm going to use 2-D and 3-D. Imagine you have a stationary sphere in a 3-dimensional space crossing through a 2-dimensional space (meaning the 2-D perspective has a circle that is a cross-section of that sphere). If…
David Starkey
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Is there any thing composed of elementary particles in this world that is not 3 dimensional?

Is there any thing composed of elementary particles in this world that is not 3 dimensional? I know that there is graphite which is singular atom thick. Is there anything in this world that has no depth? So I guess what I am asking is there an…
user135530
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In what ways is four dimension relevant to modern physics?

In what fields can the consideration of four perpendicular vectors be useful to making theories and models in physics? Is the concept of four dimension restricted to spatial dimensions?
user289661
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Do physicists have idea about medium that would be required to perceive other dimensions?

For example, to sense the existence of any object, we have eyes as receiver and photons as the medium. Similarly we have ear and sound-waves to hear, nose and air to smell and skin to receive the touch etc. And probably all these mediums are unique…
Vishwas
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Dimensionality of system vs dimensionality of space time

Suppose we work in GR, then space time is four dimensions, but, if we have a mechanical system with a high number of degree of freedoms, say five then how would we fit it into a four dimensional space time. Now that'd obviously be impossible, it'd…
tryst with freedom
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Can you give some example or 2D Objects that we experience in our daily life?

We see 3D Objects in our daily life like car, house etc. But we cannot see 2D objects. Can you give some example of 2D objects that we experience in our daily life? Don't give example of 2D Polygons/patterns on paper or screens of mobile…
Ghufran Fazal
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