137: The Fingerprint of Our Universe By Drew Stone

“The most incomprehensible thing about the universe is that it is comprehensible.” — Albert Einstein

Every so often, science encounters a mystery so profound that it humbles even our greatest minds. One of those mysteries is hidden in a deceptively simple number:137

To most people, it is just another integer. To physicists, it represents one of the deepest unanswered questions in modern science.

Hidden within the mathematics of quantum electrodynamics is the fine-structure constant, usually represented by the Greek letter α (alpha). This dimensionless constant determines the strength of the electromagnetic interaction—the force responsible for light, electricity, chemistry, and ultimately the atoms that make up everything around us.

Its value is approximately:

α ≈ 1 / 137.035999…

We can measure this number with extraordinary precision. We can predict experimental results to astonishing accuracy using it. Yet despite decades of research, we still cannot answer one deceptively simple question:

Why?

A Number Without Units

Most physical constants have units. The speed of light is measured in meters per second. Planck’s constant carries units of energy multiplied by time.

The fine-structure constant is different.

It has no units at all.

It is simply a pure number.

Richard Feynman famously described it as one of the greatest mysteries of physics, remarking that every theoretical physicist worries about this number because no one knows why nature chose it.

That observation remains true today.

What We Know

The fine-structure constant describes the strength of the electromagnetic force.

If it were significantly larger:

• Electrons would bind more tightly to atoms.

• Chemical reactions would change dramatically.

• Stars would evolve differently.

• The universe might not support life as we know it.

If it were significantly smaller:

• Atoms would be only weakly bound.

• Complex molecules might never form.

• The chemistry necessary for biology could become impossible.

Remarkably, the universe appears to exist within a narrow range where complexity—and perhaps life itself—is possible.

Modern physics also tells us something equally fascinating: the value of α is not perfectly fixed at all energy scales. Because of quantum effects, it “runs” with energy, a prediction confirmed experimentally. Whatever deeper explanation eventually emerges must also account for this behavior.

What We Don’t Know

Despite all our success describing nature, the Standard Model simply accepts the fine-structure constant as an experimentally measured input.

It does not explain it.

We know what it is.

We do not know why it has that value.

Perhaps that should make us pause.

Maybe we are asking the wrong question.

A Thought Experiment

Suppose 137 is not fundamental.

Suppose it is emergent.

Modern theoretical physics has increasingly explored the possibility that spacetime itself may not be fundamental. Instead, it could emerge from deeper relationships involving quantum information, entanglement, or underlying geometric structures.

If space and time can emerge…

Could the constants of nature emerge as well?

Instead of imagining that the universe was created with a list of predetermined constants, imagine something very different.

Imagine that the universe begins with only a set of underlying rules describing how quantum information is connected.

From those rules, geometry emerges.

From geometry, quantum fields emerge.

From those fields, particles and forces appear.

And from that deeper structure, the value we call the fine-structure constant naturally follows.

In this picture, 137 is not chosen.

It is computed.

The Fingerprint of a Universe

This idea naturally raises another question.

If multiple universes are possible—a speculative but widely discussed idea in modern cosmology—perhaps each one possesses a different underlying informational or geometric architecture.

If so, then each universe might naturally produce different emergent constants.

The fine-structure constant would no longer be an arbitrary setting.

It would become something far more interesting:

A fingerprint.

Not merely a number describing electromagnetism, but a measurable signature of the deeper structure from which that universe emerged.

Our universe’s fingerprint happens to be approximately 137.

Another universe, if it exists, might possess an entirely different one.

Whether such universes exist remains unknown. At present, there is no experimental evidence confirming a multiverse. This remains a thought experiment rather than an established scientific conclusion.

Information Before Physics?

As someone fascinated by quantum information, I cannot help wondering whether we sometimes place the foundations in the wrong order.

Perhaps information comes first.

Geometry follows.

Physics emerges afterward.

Instead of asking why electromagnetism has the strength it does, perhaps we should ask a deeper question:

What properties must an information network possess so that electromagnetism emerges with precisely this strength?

That shift in perspective may sound philosophical today.

Then again, many of yesterday’s philosophical questions eventually became tomorrow’s physics.

The Beauty of Unanswered Questions

Science often advances not because we discover new answers, but because we learn to ask better questions.

The number 137 reminds us that our understanding of reality remains incomplete.

It reminds us that beneath every successful equation may lie an even deeper explanation waiting to be discovered.

Perhaps the fine-structure constant is truly fundamental.

Perhaps future generations will derive it from a grand unified theory or a successful theory of quantum gravity.

Or perhaps one day we will discover that 137 was never a fundamental constant at all.

Perhaps it was simply the fingerprint left behind by the architecture of our universe.

Until then, one of the most important numbers in physics continues to whisper a simple invitation:

Keep asking why.

A Thought from Drew

The ideas in the final section are speculative and intended as a thought experiment. Science advances by testing ideas against observation, and I believe some of the most exciting discoveries begin with asking better questions rather than claiming early answers.

Further Reading

• Richard P. Feynman, QED: The Strange Theory of Light and Matter

• Steven Weinberg, Dreams of a Final Theory

• Sean Carroll, The Biggest Ideas in the Universe

• Leonard Susskind, The Black Hole War

• Carlo Rovelli, Reality Is Not What It Seems

• Juan Maldacena, “The Large N Limit of Superconformal Field Theories and Supergravity” (1997)