We usually think of Einstein’s theories—special and general relativity—as the foundation of physics. They tell us how space, time, and gravity behave with incredible accuracy. But they begin with assumptions: that there’s a universal speed limit, that spacetime has four dimensions, that gravity treats all matter the same.
What if those weren’t assumptions?
What if they were consequences of something deeper?
The Starting Point: What Is a Fact?
At its core, physics is about describing reality. But what actually counts as “real”?
This work starts with a simple but powerful idea:
Only things that all observers can agree on are physically real.
If two observers could disagree about something—whether it’s moving, what kind of matter it is, or which event happened first—then that thing isn’t a true physical fact. It’s just a difference in perspective.
So physics shouldn’t be built on everything that could be described. It should be built only on what survives comparison between observers—on invariant facts.
From that starting point, something remarkable happens.
From Facts to the Speed of Light
Imagine a universe where information spreads through some underlying structure. Because of basic limits—only so much can change in a given “step”—there is a maximum speed at which information can move.
But here’s the key: if observers can’t detect any absolute state of motion (no hidden “rest frame”), then that maximum speed must look the same to everyone.
That’s exactly what Einstein assumed in special relativity.
In this framework, it’s no longer an assumption—it’s a consequence of how information and observation work.
Why Space Has Three Dimensions
You might think the number of spatial dimensions could be anything.
But if you try other possibilities, things fall apart:
- In fewer dimensions, forces don’t weaken properly—everything collapses or can’t separate.
- In more dimensions, atoms become unstable and orbits break down.
Three dimensions turn out to be the only setting where stable structures—like atoms, planets, and people—can exist.
So the dimensionality of space isn’t arbitrary. It’s forced by the requirement that stable facts can exist.
Why Time Has One Dimension
Time is even more interesting.
This framework defines facts as events that all observers agree on—including their order. If two observers disagree about which event happened first, then that ordering isn’t a fact at all.
Now consider the possibilities:
- With no time dimension, you can’t represent “before” and “after.”
- With multiple time dimensions, different observers could disagree about the order of events.
The only way to have consistent, observer-independent facts is to have exactly one way to order them.
Time exists because facts must have a consistent order.
Why Gravity Is Universal
Gravity treats all matter the same way. A rock and a feather fall the same way in a vacuum. That’s the equivalence principle.
In this framework, that comes from a deeper idea: all matter is built from the same underlying ingredient—a single kind of structure in the substrate.
If there’s no fundamental distinction between types of matter at that level, then gravity has no way to treat them differently.
So the universality of gravity isn’t an assumption—it’s a consequence of underlying unity.
Why Einstein’s Equations Appear
Once you have:
- a universal speed limit,
- three dimensions of space,
- one dimension of time,
- and gravity acting universally,
the rest follows.
The standard mathematical arguments in physics show that these ingredients lead directly to Einstein’s equations of general relativity.
This work doesn’t redo that mathematics—it shows where the ingredients themselves come from.
The Deeper Idea
All of these results come from one principle:
Only observer-invariant distinctions are real.
Apply that to:
- motion → no detectable absolute frame → relativity
- matter → no fundamental distinction → universal gravity
- time → no observer disagreement → single temporal dimension
What remains after filtering out everything observers could disagree about is exactly the world we see.
What This Means
Relativity isn’t just a successful theory.
It’s what the universe has to look like if:
- information is finite,
- events can be permanently recorded,
- observers can compare those records,
- and only invariant distinctions count as real.
Where This Goes Next
This isn’t the end of the story. Some pieces are still being refined—especially how everything emerges from the deepest substrate level.
But the direction is clear:
Physics may not start with space, time, and gravity at all.
It may start with facts—and everything else follows.