Is Spacetime a Fluid?

Yes, in theoretical physics, spacetime is often modeled as a fluid, particularly a superfluid, to help unify general relativity and quantum mechanics, with gravity explained as a consequence of this fluid's properties, such as pressure gradients. This fluid-like behavior is not a direct analogy but a mathematical framework to describe spacetime's emergent nature from more fundamental constituents, similar to how water emerges from H2O molecules.

https://www.scientificamerican.com/article/superfluid-spacetime-relativity-quantum-physics/

What are the fundamental constituents of spacetime?

The fundamental constituents of spacetime are a complex and open question in physics, but current leading ideas include its potential discreteness into "chunks" or "atoms of spacetime" in theories like loop quantum gravity, or its emergence from a more fundamental reality, possibly related to quantum entanglement, as explored in some string theory contexts and entropic gravity. Alternatively, spacetime itself might be a fundamental, non-material concept, similar to a mathematical coordinate system or a physical manifold of points and tangent spaces, without deeper material constituents.

I've known for many years that I am a classical physicist, and only a classical physicist. Viewing that video convinces me that I will die a classical physicist (hopefully not for a few years yet).

I haven't spent much time looking at it, but the river model of GR is the only one that makes any sense to me:

https://www.youtube.com/watch?v=hFlzQvAyH7g

IMHO:

Perhaps spacetime is moving at the speed of C. We do not notice, because we are moving with it.

Like an object in orbit, to change the altitude, one must add energy to get to a higher altitude, or shed energy to get to a lower altitude; what we call inertia.

If two objects are at a different altitude(energy wise) and collide, the difference in energy levels must be rectified by shedding energy in the form of heat:(Enthalpy?)

Gravity is caused by the objects that have not yet caught up in a stable orbit and are still accelerating in an attempt to catch up with space time. The more massive an object, in relation to it's displacement, the greater will be the lag, or gravity.

(Just sittin' here sipping on my Gentleman Jack Black Label, and contemplating, among other things of universal important things, like does the price of eggs justify the wear and tear on a hen's cloaca?)

Another analogy could be :

It certainly seems to resist, or push back as the speed increases, especially when approaching "C".

Like a viscous liquid being forced through a nozzle, the restricted stream is "stretched" as velocity is increased. More velocity reduces the nozzle size, "Stretching" the liquid(spacetime, in this case) causing time dilation.

It becomes harder and harder to pass through the nozzle until it is fully and finally closed, and impossible to pass through.

C seems to be at least one boundary of our universe, preventing escape from our dimension.

There may be universes where C is the minimum speed, and others just like ours.

Imagine a checker board, with like dimensions touching only at the corners. Alternate dimensions(where C is the minimum speed) would be separated by solid black or white squares.

It may be possible to someday figure out how to "thread the eye of the needle" and pass through these corners, perhaps via a black hole, or other massive rotating objects(a wormhole?) if approached at a critical angle and velocity;Similar to falling through the center of a whirlpool of liquid, not touching the sides.

Jus' thinkin'

I think that electrons, neutrons and protons travel very close to the speed of light in their movement..this taps into a force that supersedes other forces we are familiar with...that force is huge and stretches for many miles with an attractive force towards other subatomic particles....as they clump together over millions of years they have only speed, distance and trajectory to keep them separated...the faster the particle the greater its mass, so we have different levels of energy in different particles, and thus different mass....space itself is inhabited by dust or parts of matter that repel against this force because it is too low in its energy content, slow moving particles..these particles are unique...anyway this is my current thinking...

In the future it might be possible to physically prove that there is no space time. If in the future we can build a container that is absent of all matter and particles, AND if we can coat it with an EM blocking film/paint, then the space inside should be void of all matter and all field energy. And cool.

That would make it absolute zero. A truly empty space. A clean spot in the eons of matter/field cosmic excrement. Void of the background. The only quiet space ever.

The demonstration of empty space. Non entity space. An absence of entity.

But it’s easy to suppose about the future.

Maybe we could build a sandwich structure that has no space, then pull it apart creating a space.

The future is now, my friend!

The good folks at Build-a-Void^®, a wholly owned subsidiary of Anechoic Chambers-R-Us^®, offers the You-Build-It 10 meter Void.

Impermeable to everything - neutrinos, hadrons, positrons; Check. EM radiation of every type; Check. Gravity… well, not so much, but we are working on that.

We, the good folks at LynDoor Industries, take the position (considering the ridiculous amount of time it takes to assemble one of these, and the crazy amount of room it takes to store and operate) that time and space are both, in fact, a ‘thing’, and coexist at the same place and time inextricably.

Sorta like the portable, expandable hole. From ACME. Some think like that I guess.

This would not be making space, this would be only filtering the empty space that is already there.

“This would not be making space, this would be only filtering the empty space that is already there.”

I like that! Catchy. Hey, would you maybe consider a side gig writing some new advertising copy for LynDoor Industries? Some of our catalog items don’t sell very well, maybe some snappy ad copy can get some of that crap stuff moving.

If you’re interested, have your people call my people, maybe we can swing a deal.