This idea comes straight out of one of the deepest tensions in modern physics: if everything is quantum, then in principle the entire universe should be described by a single wave function—but we may never be able to know what that wave function actually is.
Let’s unpack what that means and why it’s such a big deal.
🌌 The core idea
In quantum theory, a wave function encodes all possible states of a system. For something small (like an electron), we can:
- prepare it in a known state
- measure it
- update our knowledge
But when you scale that up to the whole universe, things break down.
🤯 Why the universe might be unknowable
If the universe has a wave function, then:
- It contains all information about everything—past, present, future
- There is no “outside observer” to measure it
- Any measurement we make is just a small part of the system observing itself
That leads to a strange conclusion:
👉 Even if there are multiple possible “universal wave functions,” we may never be able to tell which one is real, because we can’t step outside the universe to compare predictions objectively.
🧠 Connection to
Stephen Hawking
Physicists like Hawking took seriously the idea of a “wave function of the universe”, especially in quantum cosmology. His work (like the Hartle–Hawking state) tried to describe the universe as a მთლიან quantum object.
But even in those frameworks:
- Different wave functions can produce indistinguishable observations
- So experiments may never uniquely confirm one over another
🔍 The deeper philosophical problem
This touches on a concept sometimes called underdetermination:
Multiple theories can explain the same observable reality.
In this case:
- Different quantum descriptions of the universe
- Same measurable predictions
- No way to decide between them
So the “truth” may exist mathematically—but be forever hidden from observation.
🧩 What this means for physics
This doesn’t mean physics is broken. It means:
- There may be limits to what science can know, not just what we currently know
- Some aspects of reality could be fundamentally inaccessible, not just technically difficult
It’s a bit like asking:
“What does the universe look like from the outside?”
There may simply be no meaningful answer.
⚖️ Is this widely accepted?
Not fully—this is an active area of debate. Different interpretations of quantum mechanics handle this differently:
- Some say the wave function is real but unknowable
- Others say it’s just a tool for predictions, not reality itself
- Still others (like many-worlds) take the universal wave function very literally
🧭 Bottom line
The article is pointing to a radical possibility:
👉 Even with perfect physics laws, the universe might contain truths that no observer inside it can ever determine.
If you want, I can break down the different interpretations of quantum mechanics (many-worlds, Copenhagen, etc.) and how each one deals with this “unknowable universe” idea—they give very different answers.
