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Sun, May 31, 12:21 PM (2 days ago)to me

LET’S CONSIDER WHETHER TRAVELING THROUGH “DIMENSIONS” MIGHT BE POSSIBLE

The idea of traveling through “different dimensions” can mean very different things depending on the context of what question is actually being asked. So, what does this mean?

1) In physics: what are extra dimensions?

In modern physics, a dimension is just an independent direction or degree of freedom needed to describe reality. We humans normally experience four dimensions. We can describe 3 spatial dimensions, meaning up/down, left/right, and forward/back. To allow us to move, we need one more dimension. This is the dimension of time.

Some current theories of physics, like string theory, propose the presence of extra spatial dimensions that we do not normally detect. If those do exist, traveling through them would depend on exactly how those dimensions would be structured:

A. What if extra dimensions are really tiny and all curled up within themselves?

A common idea is that these extra dimensions may be compactified. This suggests that they are so small that particles can interact with them, but large objects, like us humans, cannot move through them in any practical sense. We can’t even recognize them.

That would mean:

• You couldn’t “step sideways” into them like a hallway.
• Movement might only show up as strange particle effects at very high energies.
• Travel through them would truly be more like accessing some kind of hidden geometry within space rather than walking into another world.

B. If extra dimensions are large

If an extra dimension was large enough, this could mean that, in principle, an intact large object could simply move through it. This would likely not be easy, because the combination of matter and forces must be “balanced” in order to allow us to leave our familiar 3D “slice” of the universe.

Here is what this would be like:

• Imagine a 2D sheet of paper that is totally inhabited by flat creatures.
• They can only move to their left or right and to the top and bottom of the paper.
• However, they could not even conceive of the ability to move “up” or “down” off the page because that “dimension” of the paper would not exist!
• Imagine that if a 3D being could lift an object off the paper and put it elsewhere, this would look miraculous to the flat creatures as the object would first disappear, then simply appear again in a totally new location. This would absolutely seem like magic to these 2D beings!

By using this analogy, a higher-dimensional pathway would allow moving object to:

• Mysteriously bypass ordinary distances,
• Simply allow object to suddenly disappear to “teleport” to a distant location,
• This would seem to connect far-apart places through an unseen “shortcut.”

These combined types of concepts, above our current human 4D universe, would be related to physics philosophies like:

• Brane-world models
• Higher-dimensional shortcuts
• Wormholes (though wormholes could be an entirely separate concept!)

2) In science fiction: What happens with parallel dimensions or alternate realities?

In fiction, “different dimensions” often means the existence of parallel universes, just outside what we know within our own. There could be alternate timelines, meaning that the history we know might be different from others that we might have experienced in a previous timeline. Even beyond this, there might be other planes of existence from any we could recognize.

If fictional travel through dimensions worked, it usually requires one of these concepts:

• Some form of a stable portal,
• A required resonance and frequency match between the separate dimensions,
• Some form of exotic energy to power these events,
• Possibly create some sort of a “rip” in the fabric of spacetime,
• Perhaps a superior technological device that would somehow shift you into another reality state.

These are imaginative storytelling frameworks, but far separate from any form of established science.

3) Could higher-dimensional travel allow faster-than-light travel?

Maybe in theory, but not in any demonstrated way.

If spacetime has some type of a hidden geometry, then a path through that higher dimension might act like a shortcut. From our perspective:

• Separate points A and B look to be far apart, yet in this higher-dimensional geometry they may be closer together than we could perceive. It might seem to be faster-than-light travel, yet this would be merely an illusion.

Let me employ a simple analogy that was used in the movie Deja Vu:

• Two points are noted on a flat sheet that are far apart on the surface of this sheet.
• Fold the formerly flat sheet so that the two points now seemingly touch each other.
• Somehow, just jump across the fold’s new shortcut.

But there are major problems for physicists. First, there is a complete lack of evidence we can access such paths. If any possibilities of using these methods exists, they might require exotic forms of matter or enormous levels of energy that we do not possess. Also, these transport mechanisms could be highly unstable, with terrible results being possible. In the eyes of the majority of our scientists, these simply violate or strain too many elements of our known physics.

4) What would it feel like to travel like this?

If higher-dimensional motion were possible, it might not feel like normal movement at all. Depending on the model, it could look like:

• Disappearing from one location and suddenly reappearing somewhere else!
• You might fly past stars or other objects by transiting around normal physical barriers without crossing them directly,
• There might be severe distortions of our senses of perspective,
• Time would possibly behave very strangely relative to any of those observers left behind,
• We might discover impossible-looking rotations or unusual rearrangements of space-time itself!

My best short answer?

If travel through different dimensions were possible, it would probably work not by moving “through magical spaces,” but instead by exploiting a deeper geometry of reality. That could make distant locations seem to be temporarily adjacent to one another. This could allow access to entirely different regions of space-time.

But as of today, this entire concept is theoretical and speculative, and not something that science knows how to do.

At least, not for our current human sciences!