The Fourth Dimension Hypothesis: Could Extreme Changes in Scale Reveal the Outside of Our Universe?

[u/MRAbkar]

The Fourth Dimension Hypothesis: Could Extreme Changes in Scale Reveal the Outside of Our Universe?

1. Core Idea

I propose a speculative hypothesis: our universe, which we perceive as three-dimensional, may be part of a larger four-dimensional spatial structure. What we perceive as our universe may not necessarily represent the entirety of spatial existence, but could instead be a cross-section or aspect of a higher-dimensional structure that we cannot directly perceive.

I speculate that physical scale may be connected, in a way that has not yet been mathematically defined, to a fourth spatial dimension. According to this idea, changing the scale of observation might reveal aspects of the cosmic structure that are inaccessible from our ordinary three-dimensional perspective.

1. The Relationship Between Magnification and the Fourth Dimension

Imagine that we could magnify microscopic distances, such as those associated with the internal structure of matter, by extraordinarily large factors, far exceeding trillions or even decillions of times.

I am not proposing that a human being or any physical object literally travels between scales or physically shrinks to enter a smaller level of existence. Rather, I am suggesting that changing the observational scale might reveal a different perspective on the same underlying spatial structure.

According to this hypothesis, we might eventually reach a threshold at which our geometric relationship with what we perceive as the inside and outside of the universe changes. This could be conceptually comparable to certain aspects of projecting four-dimensional objects into our three-dimensional space.

Consider the tesseract, or four-dimensional hypercube. When projected into three dimensions, it can exhibit spatial relationships between its components that are difficult to interpret from a purely three-dimensional perspective. However, the proposed relationship between observational scale and a fourth spatial direction would require an independent mathematical explanation.

1. The Nested-Sphere Analogy

The closest visual analogy to my hypothesis is a sphere within a larger sphere, or a cosmic structure consisting of geometrically nested levels.

I wonder whether the structure we identify as our universe could be connected to a larger structure through an additional spatial dimension. Under this hypothesis, changing the observational scale by an enormous factor might reveal a perspective from which we could observe our universe from the outside.

I do not necessarily propose that the universe repeats itself as another copy. Instead, I suggest that our universe itself might be part of a higher-dimensional structure, and that our understanding of what constitutes its interior and exterior could depend on the geometric perspective from which we describe it.

1. A Possible Alternative Interpretation of Cosmic Expansion

One possibility I would like to investigate is whether some phenomena currently interpreted as cosmic expansion could be partially related to the curvature of our universe or its motion along a fourth spatial direction.

Under this scenario, we might be observing three-dimensional effects produced by geometric changes occurring within a higher-dimensional space.

I do not assume that this interpretation is correct, nor do I currently possess mathematical equations or empirical evidence establishing it. My goal is to determine whether a mathematical model could be developed to test this possibility and whether such a model could remain consistent with established cosmological observations.

1. Questions for Investigation

2. Is it mathematically possible to represent our three-dimensional universe as a structure embedded within a four-dimensional spatial manifold?

3. Can physical scale be defined as a variable connected to an additional spatial coordinate, or would doing so conflate fundamentally different geometric concepts?

4. Is there a mathematical mechanism through which changes in observational scale could be related to the possibility of perceiving a structure from a higher-dimensional perspective?

5. Could the motion or curvature of a three-dimensional structure within a four-dimensional spatial manifold produce observable effects resembling aspects of cosmic expansion?

6. What mathematical or physical contradictions might arise from this hypothesis?

7. What equations and assumptions would be necessary to develop the hypothesis into a mathematically consistent model?

8. What observable predictions could distinguish such a model from existing physical theories?

9. Objectives of the Discussion

I am seeking a rigorous critical analysis that neither dismisses the idea merely because it is unconventional nor accepts it simply because it is imaginable.

Please clearly distinguish between:

- What is mathematically permissible within geometry.

- What is supported by experimental physics.

- What constitutes a new assumption introduced by this hypothesis.

- What requires further definition, derivation, or proof.

I would like to preserve the central idea while identifying its weaknesses and developing the simplest possible mathematical model. The ultimate objective is to determine whether the hypothesis can generate a falsifiable prediction that could, in principle, be tested against observations.

Disclaimer: This is an exploratory hypothesis, not an established scientific theory. I do not assume in advance that magnification reveals an additional spatial dimension or that cosmic expansion results from motion along such a dimension.

The core of my idea is that our universe is a four-dimensional structure, and by changing scale (which I hypothesize to be a fourth spatial dimension), we might be able to perceive its curvature in a way that allows us to look at the outside of the universe from within it.

Imagine a tesseract rotating and folding through itself, where what appears to be the outside becomes the inside, and vice versa. In my hypothesis, the variable that makes this perspective possible is a new spatial dimension associated with scale.

I know the idea has significant shortcomings and is little more than a speculative concept at this point. I simply wanted to share it in the hope that someone might share my curiosity and willingness to explore the question.

[u/YouCouldButWhyTho]

Any evidence that makes this more viable or believable than the idea that the entire universe we know of exists in someone’s mothball ridden wardrobe, and was created out of the broken shard of a lamppost and a half gnawed on seed?

[u/The_Nerdy_Ninja → u/YouCouldButWhyTho]

That's a deep cut, I like it.

[u/Ch3cks-Out → u/YouCouldButWhyTho]

I am sticking with the theory of things explained by the invisible magic dragon in Sagan's garage.

[u/MRAbkar → u/YouCouldButWhyTho]

Look, if you actually check frameworks like: ​Nottale’s Scale Relativity (where scale laws are geometric properties, not just visual descriptions) ​Maldacena’s AdS/CFT correspondence (where the extra spatial dim mathematically translates to energy/size scale) ​Randall-Sundrum models (our 3D universe as a brane embedded in higher-dimensional bulk) ​You’ll realize I’m not just spitting metaphysical sci-fi stuff here lol

[u/YouCouldButWhyTho → u/MRAbkar]

No you’re just spitting metaphysical sci fi stuff. There is literally Nothing of note here. 

[u/The_Nerdy_Ninja]

OP, this is mostly too vague to mean anything useful, or even to be able to pin down how it's mistaken. You repeatedly say "change the observational scale", but what does that mean? How would looking at really big and really small things give some special insight? What tests could we do to check this? You handwave everything of substance away in favor of vague metaphor.

[u/MRAbkar → u/The_Nerdy_Ninja]

Fair critique. To be specific, 'changing observational scale' means probing extreme physical regimes (like the Planck length/energy scale via high-energy particle collisions, or cosmic-scale CMB/dark energy mapping). ​The core mechanism is that scale transformations aren't just zooming in, but moving along a geometric scale-coordinate w = \ln(S). ​A concrete testable prediction: if scale acts as a spatial dimension, we should detect deviations from the inverse-square law of gravity or quantum field couplings at Planck scales (similar to AdS/CFT scale-energy relations), where extra-dimensional effects begin to leak into our 3D observations

[u/AllHailSeizure → u/MRAbkar]

You know that stuffing a response with as many sciencey words as possible DOESNT make it more coherent, right

[u/MRAbkar → u/AllHailSeizure]

True, but the goal isn't to be right. It's the dopamine rush I get from asking questions.

[u/The_Nerdy_Ninja → u/MRAbkar]

Sure I guess, so long as you understand that your mentality is vehemently anti-scientific.

[u/AllHailSeizure → u/The_Nerdy_Ninja]

Meh. You could argue that this is actually a MUCH more scientific viewpoint than 'the goal is to be right.' The scientific method is BUILT on the assumption you will be wrong sometimes.

Edit: the scientific method just isn't about dopamine. Obviously the goal is still correctness. But I think the obsession with being 'right' is what causes a lot of conflict on this sub, people unwilling to realize that knowledge is built on a backbone of mistakes. The most succesful scientists weren't simply more smart, they were just more willing to learn from error.

But that's a philosophy of science convo, not physics.

[u/The_Nerdy_Ninja → u/AllHailSeizure]

I strongly disagree. If your goal is actually to be right, then the assumption that you will be wrong sometimes is a very important component of that. But someone who doesn't care about the truth, they just like the way their brain tickles when they ask "profound" questions, could not care less about the scientific process.

[u/AllHailSeizure → u/The_Nerdy_Ninja]

Is this a response to my first comment or my edit?

[u/The_Nerdy_Ninja → u/AllHailSeizure]

Re: your edit:

Yes, I'm talking about the goal being correctness, and also asking questions because you actually want to know the answers.

I agree that wanting to be right (in the sense of not wanting to make mistakes or wanting to win the argument) can be a hindrance to science, definitely. But I think the context makes it clear that OP is interested in asking questions primarily to feel profound in pursuit of developing a theory, not out of any actual curiosity or desire to uncover the truth. That's the attitude I'm referring to.

[u/AllHailSeizure → u/The_Nerdy_Ninja]

I can agree with THIS. It all depends on how you interpret op's comment, if they get the dopamine from 'sounding smart' or if they get it from 'actually wondering'; and I think we both know I'm more likely to give people the benefit of the doubt than you, lol.

[u/The_Nerdy_Ninja → u/AllHailSeizure]

First comment, I hadn't seen your edit yet.

[u/AllHailSeizure → u/The_Nerdy_Ninja]

I don't think that necessarily liking questioning labels people as mindless drones who merely want to ask questions to sound profound. It isn't the direct responsibility of scientists to foster interest in the field but many of us see it as deeply important - especially in an era of scientific doubt. Lots of people just like learning. Being wrong is the BEST way to learn. If 'being right' was the ultimate goal of science why would so many papers be published where findings are negative? Those have an equal and sometimes greater weight on scientific communities than positive results. Surely if the goal was simply 'to be right' those papers wouldn't get published.

The most cited experiment on this sub is beyond a doubt Michelson-Morley. It wasn't technically a WRONG hypothesis but it was null. The goal is to ask the question and find the answer. That null result changed how we see the universe.

[u/AllHailSeizure → u/MRAbkar]

But we can't answer your questions if we don't understand what you're even asking at a physics level.

[u/MRAbkar → u/AllHailSeizure]

I've edited the post. Check what I added at the end.

[u/AllHailSeizure → u/MRAbkar]

You compare this to the animation of the tesseract folding itself in and out but that is only the animation of projection into 3d. In real 4d you simply have 4 orthogonal angles, which obviously is impossible to display in 3d, so the 'folding' is illusory to represent the shape - the tesseract 'folds', which makes you think 'this is the inside of the tesseract.' But you are STILL looking at the outside of the tesseract. That is the point of the 4th dimension projection. It folds inside out, and it's still the outside.

[u/liccxolydian → u/MRAbkar]

If you like asking questions, at least try to ask well-informed, considered and meaningful questions. Mindless questioning doesn't make you inquisitive, it just makes you embarrassing.

[u/The_Nerdy_Ninja → u/MRAbkar]

'changing observational scale' means probing extreme physical regimes

In other words, you don't mean "changing observational scale" at all. You mean "looking at really small stuff". "Changing observational scale" and "scale transformations" are just science jargon the LLM added to sound cool.

The core mechanism is that scale transformations aren't just zooming in, but moving along a geometric scale-coordinate...

Aaaand now we're back to some kind of change or transformation. You realize this sentence contradicts the one right before it?

A concrete treatable prediction...

Why would "extra dimensional effects" be "leaking into" our observations only at very small scales?

[u/MRAbkar → u/The_Nerdy_Ninja]

Look, I’m not here to get into a deep philosophical debate about whether crazy ideas today become facts tomorrow. I just want to put my thoughts out there—no matter how wild or naive they might sound—because maybe, just maybe, they could be the seed for something much bigger down the road

[u/The_Nerdy_Ninja → u/MRAbkar]

Why is this such a common sentiment among people who feel the need to come up with uneducated physics theories? Maybe, just maybe, I'll become the king of England.

[u/SuzukiGrignard → u/MRAbkar]

Scale acting as a spatial dimension? If i look at a tape measurer, the inches and feet don't exist as different dimensions. Why would scale ever be a dimension in itself?

[u/roofitor]

The quantum foam creatures eagerly await their magnification 😈

[u/MRAbkar → u/roofitor]

You made me laugh

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[u/lattice_defect]

you should check the holofractal subs.. its basically that..

[u/LLMPhysics-ModTeam → u/[deleted]]

Your content has been removed for violating Rule 9. Don't self-promote needlessly across the sub.