[QUOTE=JCDentonUNATCO;50453943]I'm still no closer to understanding the fourth dimension even after watching dozens of these types of videos. How does light work? Are there no physical limitations, things are just passing through each other? How would a living creature function?[/QUOTE]
I'm assuming there would be light being emitted in all the vertices of the 4th dimension. If dimensions even actually worked like how these videos explained, light would be locked to the 3rd dimension since we're not seeing light come out of seemingly no where in our dimension.
This makes me thing of, if anyone have made an effort in making a 4D object projected into 3D space in virtual reality (Or some stereoscopic view) yet?
Having actual perceived depth to the object might totally make things weird.
[QUOTE=Jalict;50454296]This makes me thing of, if anyone have made an effort in making a 4D object projected into 3D space in virtual reality (Or some stereoscopic view) yet?
Having actual perceived depth to the object might totally make things weird.[/QUOTE]
I remember playing a little game a while back that had anaglyph 3d and a few buttons on your keyboard corresponded to making it rotate about particular axes. I can't find it now but it was pretty fascinating.
[editline]4th June 2016[/editline]
[QUOTE=MrJazzy;50453966]I would assume light to be no different in a 4D universe? Photons or wave-lengths doesn't really limit it to 3 dimensions does it? Correct me if I'm wrong.[/QUOTE]
That's a good question, actually. Some of light's properties (i.e. the fact that it has two polarization states) comes from the fact that we live in four-dimensions, plus a feature of quantum electrodynamics called gauge symmetry. I think to have light that works like ours in higher dimensions, the gauge group of quantum electrodynamics would have to change.
Actually, all of the elementary particles come from certain properties of space-time that are related to its dimension, so it's conceivable that all of particle physics would be different.
You might be interested to read about [url=https://en.wikipedia.org/wiki/Kaluza%E2%80%93Klein_theory]Kaluza-Klein theory[/url]. Basically, if there are five dimensions of space-time, you can describe gravity [I]and[/I] electromagnetism as the curvature of space.
Would it be possible to apply a 3D projection of 4D shapes that are every-day objects instead of simply untextured polygons?
For example, say you had a room with a fully textured table, chair, and lamp, but every object was 4D, and you could rotate the room around in space like you do with these 4D polygons. Would such a thing be possible to create, and if so, what would you see?
Another video about higher dimensions: [media]https://www.youtube.com/watch?v=O4eXU8VHM2g[/media]
For those who are interested in this sort of thing, there's a three part series about cosmic superstrings [url=https://www.youtube.com/watch?v=03vIkZR2hNY]here[/url]
I wonder how long until somebody posts that godawful "Imagining the Tenth Dimension" video in this thread.
[QUOTE=Smug Bastard;50454568]I wonder how long until somebody posts that godawful "Imagining the Tenth Dimension" video in this thread.[/QUOTE]
I fucking hope never.
[QUOTE=Smug Bastard;50454568]I wonder how long until somebody posts that godawful "Imagining the Tenth Dimension" video in this thread.[/QUOTE]
I remember seeing it as a kid and it blew my mind
and then when I grew up and learnt some more about physics I was like "eeeh, what was that about?"
[QUOTE=WhyNott;50454685]I remember seeing it as a kid and it blew my mind
and then when I grew up and learnt some more about physics I was like "eeeh, what was that about?"[/QUOTE]
The guy who made it has done so much backpeddling about how "it's a new way of thinking about higher dimensions, not the standard scientific usage!"
It's a bunch of incoherent drivel.
[QUOTE=Zondac;50453582]Why does it feel like a being from the 4th dimension would be such a chaotic evil entity? Like, just morping around, breaking literally all the rules we've set for how our universe is supposed to function, and all while being completely impossible to even comprehend, as you can only see it's fucked up shadow in this dimension? Like holy fuck c'thulu better sit down[/QUOTE]
It would follow that the Cthulhu we know, that sleeps at the bottom of the ocean, is just a 'shadow-representation' of a malevolent entity that exists in a dimension greater.
[QUOTE=JohnnyMo1;50454716]The guy who made it has done so much backpeddling about how "it's a new way of thinking about higher dimensions, not the standard scientific usage!"
It's a bunch of incoherent drivel.[/QUOTE]
shit really? what's actually wrong with it? (please don't say something like "lol everything" I actually want to understand this stuff)
[QUOTE=SIRIUS;50457441]shit really? what's actually wrong with it? (please don't say something like "lol everything" I actually want to understand this stuff)[/QUOTE]
I mean, I wouldn't say that but my hands are tied because of the shittiness of the video.
Lol, everything.
Seriously, after dimension 4 that video is complete gibberish with absolutely nothing to do with how scientists or mathematicians talk about dimensions. It is completely without basis in reality or mathematics.
This guy also does a really good job at explaining how the fourth dimension works. It's a good watch imo.
[video]https://youtu.be/1wAaI_6b9JE[/video]
The fourth dimensional talk doesn't really start until about 40 minutes in, but the rest of the video is a good watch as well if you have the time.
[QUOTE=JohnnyMo1;50457845]I mean, I wouldn't say that but my hands are tied because of the shittiness of the video.
Lol, everything.
Seriously, after dimension 4 that video is complete gibberish with absolutely nothing to do with how scientists or mathematicians talk about dimensions. It is completely without basis in reality or mathematics.[/QUOTE]
how do they work then?
[QUOTE=Smug Bastard;50454568]I wonder how long until somebody posts that godawful "Imagining the Tenth Dimension" video in this thread.[/QUOTE]
On the one hand, that video got me (casually) interested in more advanced physics.
On the other hand, oh boy is it a bunch of random shit.
Question, how would 2 dimensional beings see? How would 2 dimensional beings even identify things apart?
[QUOTE=ROFLBURGER;50458810]Question, how would 2 dimensional beings see? How would 2 dimensional beings even identify things apart?[/QUOTE]
Physics uses a lot of hypothetical situations to try and abstract things to a state where we can understand them. Don't get hung up on minor details. After all, perfectly spherical cows are a thing that came about to laugh over how many hypothetical and "perfect" situations we need to create for theoretical physics.
Seeing the projections of 4D shapes is pretty cool. It does make me wish we could perceive them in their 4D state, but that's so hard for me to understand that I expect I'd just see them and go "oh neat, what's for dinner tho?".
[QUOTE=SIRIUS;50458535]how do they work then?[/QUOTE]
An n-dimensional space is just one in which it takes n numbers to uniquely specify a point. The simplest example is R^n , the set of 4-tuples of real numbers (a,b,c,d). That Miegakure video does a good job of showing and explaining what this might look like to a 3rd dimensional being.
In physics and in math beyond linear algebra, "n-dimensional" has a more general meaning. Space-time is what we call an "n-dimensional manifold" which means that if you pick a point, you can cut out a small piece of the space that can be continuously (without any ripping or tearing or puncturing) flattened out into R^n and then continuously put back. Here's what an example of that might look like:
[img]http://i.imgur.com/uxiuHcy.png[/img]
You might not be able to flatten out the whole object at once, but you can do it around any point.
That "Imagining the Tenth Dimension" video captures none of this. They've got branching possibilities, points called infinity with lines connecting them. None of it makes any sense. This is what's meant by dimension in math and physics. Our world is 4-dimensional because to tell someone where they should be, you have to give them 4 numbers: (t,x,y,z).
[QUOTE=paul simon;50450868]Still in development, releasing soonish.
Read his blog.[/QUOTE]
I tried. Im bummed as nothing definite is released.
[QUOTE=Killer900;50450092]Isn't 4th dimension time? Can't watch the video right now on phone but will later so sorry if it was answered in video[/QUOTE]
If I interpreted the video properly, you can use time to visualize what a 4th dimensional object passing through our 3D world would appear. Like if you pass a pencil through a thin membrane at a constant speed, the thin membrane would interpret a circle growing (tip to main shaft) and then disappearing as it passes through. Please correct me if this is wrong.
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