🧵 What is the "fabric" of spacetime?
Anonymous at Fri, 7 Jun 2024 17:54:49 UTC No. 16220189
What does that word actually mean? Is there any coherent explanation of this concept or is it just a kind of nebulous stand-in that we use to hold certain concepts that are required for our understanding of modern physics?
Anonymous at Fri, 7 Jun 2024 18:15:56 UTC No. 16220221
>>16220189
I too wonder that myself. If there was no aether detected, wtf is this spacetime "thing" that ripples and distorts...
And what does it distort in? A line distorts in 2D, a plane distorts in 3D, 3D distorts in spacetime... but then spacetime is supposed to distort within itself? wat?
I realize there might never be an answer so we might as well to resort to resort Alder's razor to ease our minds, but onetheless... wtf indeed!
Anonymous at Fri, 7 Jun 2024 18:18:38 UTC No. 16220228
It’s just linguistic jargon that means nothing. There’s no such thing as a fabric of space time. If we study Henery Poincaré we know that space is the latitude and longitude on earth. And time is earth rotation of earth in front of the sun realitive to your longitude and latitude of the observer of time. So In other words wherever you are on earth determines the precise time it is. Time is not real just a
Mesurment. It’s a point of reference for gps and computers to precisely synchronize.
For example time transfer for the signal handoff of your cell phone to another cell tower while driving.
Knowledge is power!!!!!!
Anonymous at Fri, 7 Jun 2024 18:27:01 UTC No. 16220255
>>16220189
That word has nothing to do with the actual content of general relativity and is ONLY used in pop-sci explanations of it.
Anonymous at Fri, 7 Jun 2024 18:29:56 UTC No. 16220268
>>16220221
Curvature in this context means that when you parallel transport a vector around a loop, the vector ends up in a slightly different direction from where it started.
Anonymous at Fri, 7 Jun 2024 18:32:50 UTC No. 16220278
>>16220255
Einstein was a fraud who copied henery Poincaré work most of his theory is utilized by gps. Which is why gps have atomic clocks aboard the gps satellites
Anonymous at Fri, 7 Jun 2024 18:36:56 UTC No. 16220286
>>16220278
You're getting your woke history mixed up. Poincaré worked on special relativity. In this context you're supposed to say he copied from Hilbert.
Anonymous at Fri, 7 Jun 2024 18:38:47 UTC No. 16220289
>>16220228
>Time is not real just a Mesurment
Of what?
Anonymous at Fri, 7 Jun 2024 18:43:14 UTC No. 16220295
>>16220268
Nope, that's curvature of a spatial manifold. You can't do that in spacetime because you can't go backwards in time.
Anonymous at Fri, 7 Jun 2024 18:44:23 UTC No. 16220297
>>16220278
Poincare stole it from a black man.
Anonymous at Fri, 7 Jun 2024 18:49:23 UTC No. 16220311
>>16220189
When people talk about the fabric of spacetime they're talking about geometry. If you think of geometry in elementary school terms, there must necessarily exist some kind of background in which objects can exist. Plane geometry requires a plane. But the plane in plane geometry isn't a THING. It has no substance. It's just the space in which interesting objects exist. The fabric of spacetime is the background in which everything in the universe exists. Einstein's key insight is that this background does not obey the laws of Euclidean geometry. It's actually a different kind of geometry that can be curved. Calling spacetime a fabric is just a metaphor for the fact that it's a geometric background that can have curvature.
Anonymous at Fri, 7 Jun 2024 19:11:07 UTC No. 16220341
>>16220189
There are no straight lines in the universe
Anonymous at Fri, 7 Jun 2024 19:15:17 UTC No. 16220346
>>16220341
Actually since the universe is overall flat there are infinitely many straight lines in the universe.
Anonymous at Fri, 7 Jun 2024 19:17:16 UTC No. 16220349
>>16220311
>too lazy to find physical causes for a physical phenomenon?
>just geometrize it, now it's "part of the background" and needs no explanation
Now I see why string theory was so popular.
Anonymous at Fri, 7 Jun 2024 19:24:03 UTC No. 16220365
>>16220349
Raise your hand if you understand even the basic concepts behind general relativity.
Not so fast, anon.
Anonymous at Fri, 7 Jun 2024 19:29:20 UTC No. 16220381
>>16220228
>Knowledge is power!!!!!!
It's more of a conduit of power.
Anonymous at Fri, 7 Jun 2024 19:37:19 UTC No. 16220394
>>16220311
Take the portal problem that's often posted on this board and image a stationary set of portals.
Now imagine one of the portals moving through space (relative to the other). Is "space" or whatever "entering" the portal that's moving?
If instead of two portals, you imagine an open window fame which is "moving through space," is "space' moving through it?
Anonymous at Fri, 7 Jun 2024 19:41:37 UTC No. 16220401
>>16220394
Space has no attributes.
Anonymous at Fri, 7 Jun 2024 19:48:49 UTC No. 16220424
>>16220401
what is happening when a straight line path is curved by a gravitational field?
Anonymous at Fri, 7 Jun 2024 19:54:29 UTC No. 16220434
>>16220424
nothing happens to "a straight line". photons are curved by gravity despite being 'massless' because they are bound by the higgs field. no different than a charged particle in an electric field
Anonymous at Fri, 7 Jun 2024 19:54:34 UTC No. 16220435
Anonymous at Fri, 7 Jun 2024 19:57:50 UTC No. 16220441
>>16220189
I think it's just a topological constraint
Anonymous at Fri, 7 Jun 2024 20:19:48 UTC No. 16220481
>>16220365
The space around my hand is curved as to appear not to be raised.
Anonymous at Fri, 7 Jun 2024 20:20:37 UTC No. 16220482
>>16220434
>no different than a charged particle in an electric field
Okay, that actually makes sense
But why does time warp with speed "through space?"
Anonymous at Fri, 7 Jun 2024 20:22:16 UTC No. 16220486
>>16220482
Because of how time is defined.
Anonymous at Fri, 7 Jun 2024 20:26:15 UTC No. 16220495
>>16220486
How's that?
Anonymous at Fri, 7 Jun 2024 20:59:52 UTC No. 16220571
>>16220495
Because Mother Nature doesn't have a watch.
Anonymous at Fri, 7 Jun 2024 21:15:57 UTC No. 16220617
>>16220434
>photons are curved by gravity despite being 'massless' because they are bound by the higgs field
Photons do not couple to the Higgs field at all.
Anonymous at Fri, 7 Jun 2024 21:16:58 UTC No. 16220620
>>16220394
>Take the portal problem
No. That's stupid. "If we ignore all the laws of physics, what do the laws of physics say will happen?" Yawn.
Anonymous at Fri, 7 Jun 2024 23:03:25 UTC No. 16220829
>>16220289
Time is a measurement of the earth’s rotation in front of the sun.
We can scale it down and measure a second as a frequency. To give a precise a precise measurement for computation. A computer is also a clock.
Anonymous at Fri, 7 Jun 2024 23:15:21 UTC No. 16220862
>>16220829
What? No it isn't. Time is that thing that separates events which occur at the same place. Every year the earth ends up at the same point in its orbit, but the two events are separated by one year of time. Time is a real, physical thing. It's not "a measurement" of anything.
Anonymous at Fri, 7 Jun 2024 23:20:13 UTC No. 16220870
>>16220862
>the earth ends up at the same point
The solar system is moving through the universe. The earth never returns to the same place.
Anonymous at Fri, 7 Jun 2024 23:28:09 UTC No. 16220881
>>16220870
Sure it does. Inertial motion is relative, anon. You can set your frame of reference to anything you want.
Anonymous at Fri, 7 Jun 2024 23:28:41 UTC No. 16220883
>>16220862
Time is not real idiot. Just because you experience different events that doesn’t mean time exists.
When different events occur they take place because of motion with use of energy. Motion is the use of energy. When your car moves it’s because of fuel wich is energy.
No energy? No motion. Idiot
No fuel the car just sits there
Events happen because of energy.
We all exist on the same plane at the same time. It could be 12pm here and 7pm in another country at the same moment. Does that mean they are in the future idiot? Lmao.
Linguistics and technical jargon have ruined physics. Even Einstein who I hate admitted this fact.
Anonymous at Fri, 7 Jun 2024 23:29:45 UTC No. 16220886
>>16220883
Bwah ha ha. LMAO. Try telling a cosmic-ray muon that time isn't real, faggot.
Anonymous at Fri, 7 Jun 2024 23:32:44 UTC No. 16220889
>>16220886
Cosmic ray muon??? Here we go with the sci-fi fag stuff again.. honestly I hate astrophysicists they have dumbbed down the masses…
Anonymous at Fri, 7 Jun 2024 23:41:28 UTC No. 16220900
>>16220889
Which word confused you, anon?
Anonymous at Sat, 8 Jun 2024 00:48:13 UTC No. 16220999
>>16220900
they
Anonymous at Sat, 8 Jun 2024 07:33:01 UTC No. 16221504
>>16220829
>Time is a measurement of the earth’s rotation in front of the sun.
>We can scale it down and measure a second as a frequency.
So frequencies are real? What makes them more real than their periods? Hardly any motion is truly periodic.