Entropic Inevitability and the Arrow of Time
SleepWise · 2023
"The perceived unidirectional flow of time is not a fundamental property of the universe's mechanics, but an emergent psychological symptom of the Second Law of Thermodynamics and cosmic entropy."
The fundamental laws of physics are time-symmetric — a video of colliding billiard balls looks valid forward or backward. Yet macroscopically, time strictly moves forward: an egg cracks but never un-cracks. This asymmetry, the Arrow of Time, is dictated entirely by entropy, a measure of disorder. The Second Law of Thermodynamics says entropy in an isolated system must always increase, so the direction of time is simply the direction in which cosmic disorder grows.
Entropy increases because there are vastly more ways for a system to be disordered than ordered — a shattered egg has millions of possible arrangements, an intact one only a few. Systems naturally evolve toward higher-probability (disordered) states. We experience an Arrow of Time at all only because the universe began in an unimaginably low-entropy state at the Big Bang, and we're riding that gradient as the universe slowly equalizes. Even forming a memory generates heat — entropy — tying human time-perception directly to cosmic disorder.
Why do macroscopic events (like a breaking egg) demonstrate an Arrow of Time, while microscopic events (like particle collisions) are generally time-symmetric?
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The explanation above is written with AI assistance. These are the originals — go to them to check it.
- The Arrow of Time and entropic irreversibility (Eddington, 1927)Wikipedia
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