What It Proves And What It Does Not Prove
Introduction
This document addresses one of the most frequently cited claims in modern physics: that the double-slit experiment proves that light travels, that observation collapses reality,\ and that light behaves as both wave and particle.
This experiment is often described as the ultimate proof anyone can reproduce at home.
That claim is false.
This document explains why, without proposing new experiments or speculative philosophy. It removes assumptions that were already disproven before the double-slit experiment was ever interpreted.
What remains is not paradox, but geometry.
What Mainstream Physics Claims
This Experiment Proves
Standard physics textbooks and popular explanations state that the double-slit experiment demonstrates:
1. That light and matter exhibit wave–particle duality.
2. That individual particles travel through both slits at once.
3. That observation collapses a probability wave into physical reality.
Interference patterns are said to prove wave behavior. Localized impacts are said to prove particle behavior. When detectors are added at the slits and the pattern disappears, this is claimed as evidence that observation alters reality.
These conclusions depend on assumptions never demonstrated by the experiment itself.
What the Experiment Actually Contains
The experiment contains only:
• A source
• A barrier with one or two openings
• A detection surface
No speed is measured.
No path is measured.
No object is tracked in flight.
The only observable result is where light is resolved at the final surface.
Core Misinterpretation
The error occurs when geometry is mistaken for behavior.
When two openings are present, a structured pattern appears. Physics interprets this as evidence that something traveled, split, interfered with itself and reassembled.
The experiment never shows this.
It shows only that resolution depends on boundary conditions.
The slits do not divide light.
They divide the geometry that constrains resolution.
Trajectory VS Geometry
This distinction is the hinge.
A trajectory requires motion, path, time and objecthood.
Geometry requires only constraint and boundary.
The double-slit experiment demonstrates geometry, not trajectory.
When trajectory is assumed, physics is forced into contradiction: light must be both wave and particle. This contradiction is mislabeled as duality.
Remove trajectory and the contradiction disappears.
Why Observation Does Not Collapse Reality
When detectors are placed at the slits, the interference pattern disappears. Physics claims this proves observation alters reality.
What actually happens is simpler.
The detector changes the boundary conditions.
The system is no longer the same system. Geometry changes. Resolution changes.
Observation is not causal.
Geometry is.
Why Light is Not a Particle
Light has no rest mass.
Light has no inertia.
Light has no weight.
Calling light a particle violates the definitions used elsewhere in physics. Light does not meet the criteria for particle identity.
Wave and particle language persists only because both rely on the false premise of travel.
What the Experiment Actually Proves
When stripped of inherited assumptions, the experiment proves one thing:
Light is resolved according to geometry.
Patterns arise from boundary-defined resolution, not from objects interfering with themselves in flight.
No observer collapses reality.
No particle chooses a path.
No wave propagates through space.
Conclusion
The double-slit experiment does not reveal a strange universe.
It reveals a misinterpreted one.
Light does not travel.
Light is resolved. Resolution obeys structure, not belief.
Produced by The Lilborn Equation Team:
Michael Lilborn-Williams
Daniel Thomas Rouse
Thomas Jackson Barnard
Audrey Williams