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/sci/ - Science & Math

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7030016 No.7030016 [Reply] [Original]

why do people sometimes say time is a dimension?

>> No.7030028

Imagine you as a fertilized egg cell. Now imagine your death. You are a 3 dimensional being, but your entire life was through the fourth dimension. Time is the fourth dimension.

>> No.7030031

>>7030016
Why shouldn't they?

>> No.7030044

>>7030028
everything is a dimenson then, there are literally billions of dimensions in space

>> No.7030053

>>7030044

Those extra dimensions you're looking to consider aren't linearly independent of each other, and so don't count.

>> No.7030057

We're just living on the d/dx of the fourth dimension, which we perceive as passing time.

>> No.7030060

>>7030057
No. We move through geodesics in the manifold, not through the tangent space. Get your shit together before talking.

>> No.7030063
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7030063

Because in special and general relativity time is defined as a dimension, you retarded piece of shit.

>> No.7030065

they are dumb ass niggas

>> No.7030069

>>7030044
no. in the space YOU can move in there are 3 dimensions. Also you can move through time but only forward. 5th dimension would be being able to jump between different timelines (assuming they exist), making a plane of timelines, 6th dimension would be making from that plane a 3D space, and being able to chose any of the timelines of the infinite planes of that 3D space, just like 1,2,3 dimensions work, that's how dimensions 4.5. and 6 work, don't know about others

>> No.7030075

>>7030069
Stop watching YouTube videos and go read a book.

>> No.7030080

>>7030075
How is what I said wrong?
This is true. Did you even watch Interstellar you fucking faggot.

>> No.7030083

>>7030016
Look, "dimension" in the way it's used by plebs usually means "dimensions of space time" and time is quite clearly a dimension of space time. "dimension" has no absolute meaning. It's always dependent on what you are talking about. Space has three dimensions, a Weyl spinor has two dimensions, a Energy-stress tensor has six dimensions and so forth. Dimensions are simply the degrees of freedom your object has. There's really no way of arguing about it.

>> No.7030103

>>7030060
Can you explain?

>> No.7030138

>>7030069
Why are you people in this board

>> No.7030146

>>7030103
Mass curves space
Particles move through this curved space following geodesics in a fourth-dimensional space along positive time

>> No.7030165

>>7030103
Yes. This is not me >>7030146

Space time is a 4-dimensional Hausdorff differentiable manifold, equipped with a ((locally) differentiable and invertible) Lorentzian metric and a symmetric metric-preserving connection (Levi-Civita connection). In absence of external forces, particles move through geodesics, which means curves that fulfill the geodesic equation: <span class="math">u^{\alpha} \nabla_{\alpha} u^{\mu}[/spoiler], where <span class="math">u^{\mu} = \frac{d x^{\mu}}{d \tau}[/spoiler] with tau the proper time (if the geodesic is time-like. If it's null, then it has to be any affine parameter). This curve, <span class="math">x^{\mu}(\tau)[/spoiler] represent points in the manifold and this is where particles move and 'live'. On the other hand, <span class="math">{\frac{\partial}{partial x^{\mu}}}[/spoiler] is a basis for the tangent space of the manifold, not part of the manifold itself.

>> No.7030175

>>7030165
I'm retarded. Geodesic equation:

<span class="math">u^{\alpha} \nabla_{\alpha} u^{\mu} = 0[/spoiler]

Basis of the tangent space: <span class="math">\{ \frac{\partial}{\partial x^{\mu}} \}[/spoiler]

>> No.7030237

are u from spain?

>> No.7030293

>>7030016
Unas pajillas mentales hombre. Sin mariconadas.

>> No.7030580

>>7030069
That's what you'd think but no that's not how it works apparently.

Although I wish someone on here would explain why this is untrue.

>> No.7030589

>>7030580
It's untrue because he's implying 5th and 6th dimensions are degrees of freedom in time and not in space.

>> No.7030617

>>7030580
Because time is a temporal dimension and not a spacial one. Adding a fourth dimension would mean that you could view all facets of 3d space as if you were looking on a 3d plane. So no, time is not the fourth dimension

>> No.7030621

>>7030617
*2d plane

>> No.7030629

>>7030617
>So no, time is not the fourth dimension

You mean time is not the fourth spatial dimension, right? Because if your manifold is (locally) isomorphic to RxS^3, for example, then time is literally the fourth dimension (or the first one, depends on how you count).

>> No.7030662

>>7030629
Yes, that is what I meant.

>> No.7030667

>>7030069
get the fuck out of here. I know the video you're referring to and if you think that has any legitimate basis than you are fucking retarded

>> No.7030687

>>7030080
>learning science from a something that is meant just to entertain you

>> No.7030758

>>7030080
Interstellar had the most bullshit "science" that any movie has had in a looooooooong time

>> No.7030861

>>7030016
OP. Because they dont understand the difference between direction and movement.

And each time i see "time is the 4th d" i want to demonstrate the relatavistic nature of actual to perceived velocity as my fist impacts noses...

>> No.7031235

>>7030083
Beautifully put. Degrees of freedom sounds good.

/thread

>> No.7031245

>>7030758
Good enough for being a mainstream blockbuster. But yes, mostly bullshit.