Question about fourth and fifth spatial dimensions
Ive heard the fourth and fifth dimensions described as 'tiny', and 'rolled up'. That particles trying to move along them is like a golf ball being sucked through a water hose.
That is an unsatisfactory description, to say the least. Can one of my fellow nerds please explain to me these concepts?
Mindslave
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2 parter:
http://www.youtube.com/watch?v=JkxieS-6WuA
http://www.youtube.com/watch?v=ySBaYMESb8o
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nikki =)
that is one of my favourite movies of all time

Now i'm watching the carl sagan fourth dimension stuff abit which isnt all that clear. Imagining the 10th dimension website is awesome, they also have a few alternative ways of explaining it.
Personally, when i imagine the fourth dimension i imagine that i am able to see every aspect of my entire life from birth to death in one single glimp, as well for all others. So i can choose to see what happens in 30 years at will, etc.
I believe that for the fifth dimension, it means that i can see the above but not only for this life, but for all possible outcomes of my life. So i can choose to see what happens in 30 years if condition x y and z is present.
I love, love, love thinking about this kind of stuff. Its mind boggling

Cant listen to the sound of the video at work, but I suspect thats not what Im asking about (the graphics might be misleading). I saw the one with Sagan talking about a cube being the shadow of a Tesseract when I was a child.
Im okay with N Euclidean dimensions. Im asking about the specific 4th and 5th non-standard spatial dimensions predicted in current models of particle physics.
As far as I am aware, time is the 4th dimension, is it not?
As dimensions are little more than coordinates used in location and description of mass and movement within time-space.
I have read a couple of the books on string and M-Theory, and have heard the explanations of these 'tiny, coiled up dimensions', but even mathematically these theories tend to break down at just about the same point, no matter which theory is tested.
If there is a tiny coiled up dimension within these other 4 dimensions, does it and all within it not still exist within the classic 4? And yes, I'm aware that space can be warped, that's no excuse lol
Anything beyond the classic, 4 dimensional model of space-time is to my mind the same kind of mental gymnastics that the organized religions use to explain away the conflicts that exist within their respective doctrines.
The aim of these theories is to find the Single Theory, the Unified Field Theory.
But I believe that where these theories fail is not in lack of extra dimensions, but lack of understanding/real explanation of the true nature of infinity, and misunderstandings about the way from which order is derived from chaos.
Infinity means infinity in scale.
You can keep on looking down smaller and smaller forever and ever, it truly never ends.
You can also keep looking up bigger and bigger, that never ends also.
Infinity is chaos. In order for there to be real true infinity, then every single possibility must exist, and that generates the inevitability that within that infinite chaos, at some point order or the semblance of order will take place by chance, over and over again, on every possible scale.
We are all aware I'm sure how the 117 known elements were created from supernova stars exploding after the big bang, and the resultant and the resultant exploded matter getting into other supernova stars and et cetera.
And we are aware that the atomic number of each element represents its atomic weight.
I say to you that in infinite, non-linear time, there are an infinite number of elements, some of which are infinitely heavy. This weight so warps space as to create more big bangs, creating more of the same, and moving bits of matter and space its self at infinite speeds even, even faster than 186,282 miles per second, which most people consider to be the universe's speed limit.
Even within the realm of an infinite number of infinities, with never-ending brane-type non-linear time, the location and duration of any given point can still be explained 4-dimensionally by 'stepping out larger' than all these infinities together, or shrinking your perception to only include local data within just one of them. Either way, same result. Anything else is to my mind mental gymnastics
As dimensions are little more than coordinates used in location and description of mass and movement within time-space.
I have read a couple of the books on string and M-Theory, and have heard the explanations of these 'tiny, coiled up dimensions', but even mathematically these theories tend to break down at just about the same point, no matter which theory is tested.
If there is a tiny coiled up dimension within these other 4 dimensions, does it and all within it not still exist within the classic 4? And yes, I'm aware that space can be warped, that's no excuse lol
Anything beyond the classic, 4 dimensional model of space-time is to my mind the same kind of mental gymnastics that the organized religions use to explain away the conflicts that exist within their respective doctrines.
The aim of these theories is to find the Single Theory, the Unified Field Theory.
But I believe that where these theories fail is not in lack of extra dimensions, but lack of understanding/real explanation of the true nature of infinity, and misunderstandings about the way from which order is derived from chaos.
Infinity means infinity in scale.
You can keep on looking down smaller and smaller forever and ever, it truly never ends.
You can also keep looking up bigger and bigger, that never ends also.
Infinity is chaos. In order for there to be real true infinity, then every single possibility must exist, and that generates the inevitability that within that infinite chaos, at some point order or the semblance of order will take place by chance, over and over again, on every possible scale.
We are all aware I'm sure how the 117 known elements were created from supernova stars exploding after the big bang, and the resultant and the resultant exploded matter getting into other supernova stars and et cetera.
And we are aware that the atomic number of each element represents its atomic weight.
I say to you that in infinite, non-linear time, there are an infinite number of elements, some of which are infinitely heavy. This weight so warps space as to create more big bangs, creating more of the same, and moving bits of matter and space its self at infinite speeds even, even faster than 186,282 miles per second, which most people consider to be the universe's speed limit.
Even within the realm of an infinite number of infinities, with never-ending brane-type non-linear time, the location and duration of any given point can still be explained 4-dimensionally by 'stepping out larger' than all these infinities together, or shrinking your perception to only include local data within just one of them. Either way, same result. Anything else is to my mind mental gymnastics

Extra dimensions are primarily an mathematical artifact. They provide the "room" in which all of the symmetries can be defined without producing troublesome infinities or singularities. Four dimensions is deficient in the mathematical sense. In point of fact all we can experience with the kind of sense organs we have are three spatial dimensions and time. But the theory makes greater demands upon us than our senses can provide so we resort to mathematical abstraction.
Think about this. If you have N point masses each with a position and momentum then the system of of the N points can be described by a state vector of dimension 6*N. So you need a 6*N space to describe the possible states of the N point system over time. This is a mathematical artifact but it is connected to the physical reality we live in and perceive.
ruveyn
Extra dimensions are primarily an mathematical artifact. They provide the "room" in which all of the symmetries can be defined without producing troublesome infinities or singularities. Four dimensions is deficient in the mathematical sense. In point of fact all we can experience with the kind of sense organs we have are three spatial dimensions and time. But the theory makes greater demands upon us than our senses can provide so we resort to mathematical abstraction.
Think about this. If you have N point masses each with a position and momentum then the system of of the N points can be described by a state vector of dimension 6*N. So you need a 6*N space to describe the possible states of the N point system over time. This is a mathematical artifact but it is connected to the physical reality we live in and perceive.
ruveyn
pretending i know what you are talking about, i wonder, what does this have to do with golfballs in hoses, with that spatial 4th dimension?
Hence the thread title, asking about the fourth and fifth *spatial* dimensions.
Err... its not. There is a difference between an evolved, descriptive, consistent and predictive language and a forced, static, logical-fallacy-riddled world view. They are pretty much the opposite of each other, actually.
When particularly whack-o theists try to denounce SQRT(-1) because it is 'imaginary', I explain to them how radio waves cant be explained without complex numbers. Most of them are okay with radio waves...
You can keep on looking down smaller and smaller forever and ever, it truly never ends.
You can also keep looking up bigger and bigger, that never ends also.
Infinity is chaos. In order for there to be real true infinity, then every single possibility must exist, and that generates the inevitability that within that infinite chaos, at some point order or the semblance of order will take place by chance, over and over again, on every possible scale.
We are all aware I'm sure how the 117 known elements were created from supernova stars exploding after the big bang, and the resultant and the resultant exploded matter getting into other supernova stars and et cetera.
And we are aware that the atomic number of each element represents its atomic weight.
I say to you that in infinite, non-linear time, there are an infinite number of elements, some of which are infinitely heavy. This weight so warps space as to create more big bangs, creating more of the same, and moving bits of matter and space its self at infinite speeds even, even faster than 186,282 miles per second, which most people consider to be the universe's speed limit.
That is not what infinity means. Read up on the cardinality of infinity (aleph numbers), the quanta of space and time (Planck time & space), or even just l'Hôpital's rule and the basic calculus of infinitesimals to get a better idea of why the premise behind what you said was borked.
In fact, you just demonstrated the principle of explosion.

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Again, Im okay with R[sup]n[/sup] euclidean space, what Im not okay with is the implication of these extra, 'tiny, rolled up' dimensions that Ive only ever heard nebulously, patronizingly described on TV programs.
And ruveyn, thats fine for a finite dimensional vector space. Thats not what Im asking about - Im at peace with linear algebra.

Also, I still havent watched that video >,< meant to last night, but got caught up on Dexter instead.

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EDIT: Watched the first minute and a half of video with sound off (but captions). Flatlanders dont see a 2d crossection of 3d objects, they see a 1d projection of a 2d cross-section of a 3d object... just like we see in 2 dimensions.
I actually watched a fan made version of that same video which the creator recommended - it was supposed to have more advanced annotations. A choice example of these annotation is: "Are dogs more 5th dimensional then us?". I thought, maybe it was just an errant fan.
Then I went to his blog. WOW. What utter BS. Well informed BS, but BS. This is the sort of stuff my astrologist grand mother thinks is cogent.
That is not what infinity means. Read up on the cardinality of infinity (aleph numbers), the quanta of space and time (Planck time & space), or even just l'Hôpital's rule and the basic calculus of infinitesimals to get a better idea of why the premise behind what you said was borked.
In fact, you just demonstrated the principle of explosion.
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Thank you, I will read about those things that you have mentioned
I don't think I explained what I was thinking properly, I apologize for I am not at all a mathematician or aquainted with algebra or complex mathematical equations.
What I meant to express is that to my mind, it seems that perception can go down ifninitely smaller for ever, and infinitely larger as well. It has been quite a while since I have read any quantum physics stuff, but I do still find it very interesting. Planck time & space basically says that a Planck is as small as it goes, right? I apologize again if that's not what it means, like I said, it's been awhile (but the reason I continue to post here is because I am very interested in learning). So if what I said about infinite measure of scale is the theory of explosion, and there is now a limit upon how small you can go (which I don't buy), is there then a limit also to how big?
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Again, Im okay with R[sup]n[/sup] euclidean space, what Im not okay with is the implication of these extra, 'tiny, rolled up' dimensions that Ive only ever heard nebulously, patronizingly described on TV programs.
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These are what I was originally trying to say that I don't agree with, basically that they and everything within them still must exist within the classic 4-d model, but I think I must have gotten a little side-tracked. That happens to me quite a bit.
I apologize for posting my opinion, based upon casual knowledge and in layman's terms, in a thread full of people who are clearly more educated on the subject than I am. I did not have the intention of trying to prove anyone wrong, or to try and be a know it all. I have a pretty clear picture in my mind, but the words are foggy for me. I enjoy reading all of your thoughts on the subject, and if it is ok, could you guys try and use analogies to explain some of the more complex things when you are posting them?
It makes it easier to understand for people like me, who are not classically educated in mathematics beyond a Jr. High/High School level to understand, and I do want to understand.
I really am sorry if my first post in here came off as snarky or something, that's really not the way I intended it, maybe I got a little excited, because anytime I talk to anybody I know about stuff like this, they seem to just shut down and not care about it at all, as if knowing how things really work is not necessary at all.
Thanks guys all of you, and please keep posting on subjects like this, and providing links to where I can get more, I am eager to learn as much as I can
@huggs
Just to clarify, Im not trying to be rude.
Okay, forget what I said earlier. Stop reading books about string theory. (I know its exciting!) Instead, read books about Algebra. Then, learn Trigonometry. Then, learn Calculus. From there, learn Differential Equations and Linear Algebra. The khanacademy.com is by far the best resource available to you.
[sup]n[/sup] is supposed to make n appear as a superscript - as an exponent. R with an exponent of n means n dimensions, because R means "the set of real numbers", which is used to describe your position on that dimension. Basically, every dimension that everyone has been talking about (and youve ever dealt with in real life) is Euclidean - it just means that triangles still have 180 interior degrees, and things like that.
There is no classic 4d model, unless you mean Minkowski spacetime (basically, 3d space + 1d time + relativity).
Be careful with that. As I always say: "If you cant teach something, you dont understand it." - basically, you can get really bad misconceptions that way.
Im very glad/excited that you have a legitimate drive to learn how the universe works, but in order to do so you have to be mathematically literate. In order to /really/ explain what I mean by things like 'vector space' Id have to basically teach you Linear Algebra.
PS: Math STARTS with Algebra - everything before it is arithmetic. Make sure you find a good tutor, especially if you are significantly older than the age it is usually taught: 99% of math teachers suck at teaching math.
PPS: Ive yet to hear of a mathematician who finds how infinity works as intuitive. Infinity is not a number. Basing assumptions of how infinity works on math, or real world experience, will lead any one awry.
PPPS: Seriously, khanacademy.com
@Death_of_Pathos:
No, I didn't think you were being rude at all. I actually really appreciate you clarifying things for me, because like you said, most math teachers suck at teaching math.
If anything, I felt like I was being rude by posting in a thread that is to be honest, a little over my head. It's like when noobs go on a developer's website and post things like "I did everything you described in such and such thread, and now my computer won't boot. Please help me"
That drives me nuts, and it's pretty much the same as what I did.
Devs are doing some pretty advanced stuff, and won't have time to do that stuff if they have to help every noob who corrupts their bootloader.
I am only High-School educated, and to be honest, I only paid attention to things I was interested in at school.
I asked every math teacher I ever had where pi came from, and none of them could ever give me the answer. They were frickin' math teachers, come on!! Well thank god for them internets, right?
That kind of thing is probably a huge part of why I never pursued really any further knowledge of math.
But your responses have inspired me to learn more, and I thank you.
Now if you'll excuse me, I've got some reading to do...
LordoftheMonkeys
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Phrases like "tiny" and "rolled-up" are used to dumb down something that would otherwise require a lot of mathematics to explain. It's probably something that you can only truly understand if you study it in-depth, and this means studying something beyond the level of Discovery Channel and Scientific American.
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For an example of extra dimensions see the following:
http://en.wikipedia.org/wiki/Kaluza%E2% ... ein_theory
The Kaluza-Klien theory postulated a compact (basically rolled up) 4-th spatial dimension in addition to the three usual spatial dimension and the time dimensions to give a total of five dimensions. The idea was to provide some extra "room" so that the equations of general relativity (pertaining to gravitation) and the equations of electrodynamics could be derived from the same theory.
Kaluza Klein failed because it predicted effects that were nowhere observed, but it was a forerunner of some of the more modern string and brane theories.
ruveyn
That is an unsatisfactory description, to say the least. Can one of my fellow nerds please explain to me these concepts?
What is meant is that those extra dimensions are compactified, for example like a circle or a sphere. In other words, if an object had to move in those extra dimensions far enough, they would end up back at the same point. The hose pipe analogy is to demonstrate why we only see the familiar three spacial dimensions. Instead of a hose pipe, think of a telephone cable. If we look at a telephone cable from a distance, we can only on dimension as it appears as a long line. However, the cable is not one dimensional because it has a thickness. So, if you consider the perspective of an ant crawling on the telephone cable, it's not only able to move along it but is also able to crawl around the outside of the cable and thus is able to see a second dimension. So, in principle, the reason why we wouldn't see these extra dimensions is because they are compactified to an extremely small size.
Although they do provide enough degrees of freedom for the strings in string theory to vibrate. Those strings do not have enough space to vibrate the way we want them to in the familiar 3 dimensions. So without the extra dimensions, string theory can not be self-consistent.
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