Physics Allows More Dimensions—So Why Do We See Only Three?

Hey guys! We’re now live on Spotify🎧 Listen here: https://open.spotify.com/show/1Nm0Qc8... You move through three directions without ever wondering why there are only three. Left and right, up and down, forward and back, and never a fourth to be found. It feels less like a fact about the universe than like the stage the universe is printed on. But the equations of physics allow other numbers freely, four dimensions of space, or five, or two. So why did reality settle on three? Tonight we follow that quiet question all the way down, from the orbits of planets to the insides of atoms to the strange arithmetic that governs every particle, and out to the single square on the map of all possible universes where anything can exist at all. A slow, unhurried walk to the place where physics has too many answers and still cannot say why. Get cozy and let this slow walk through the dimensions of space keep you company tonight. Subscribe to Nap Theory if you enjoy taking the long way around the universe. CHAPTERS 0:00 Introduction 1:32 The Question You Never Ask 11:15 The Inverse Square Law Is Geometry 22:27 Why Orbits Fail Above Three 34:37 The Two Dimensional Loophole 44:19 How Atoms Would Collapse 56:54 A Ceiling With No Floor 1:06:29 What A Particle Really Does 1:18:42 The Number Matter Balances On 1:32:32 The Force That Disagrees 1:42:02 The Edge Of Chaos 1:53:29 Three Dimensions And One Time 2:05:40 The Why That Never Comes SOURCES Ehrenfest — Why Observable Space Is Three Dimensional (review) — https://arxiv.org/pdf/1502.04989 Life and Space Dimensionality: Old and New Entangled Arguments — https://arxiv.org/pdf/1608.05298 On the Physical Problem of Spatial Dimensions — https://arxiv.org/pdf/1205.4916 Hydrogen Atoms in Higher Dimensional Euclidean Spaces — https://arxiv.org/pdf/1205.3740 Tegmark — On the Dimensionality of Spacetime (arXiv) — https://arxiv.org/pdf/gr-qc/9702052 Tegmark — On the Dimensionality of Spacetime (Class. Quantum Grav.) — https://iopscience.iop.org/article/10... Observed Spacetime Dimensionality from Fundamental Principles — https://arxiv.org/pdf/1303.5634 The Fine-Tuning of the Universe for Intelligent Life — https://arxiv.org/pdf/1112.4647 A Case for Three Dimensions (Engines of Our Ingenuity) — https://engines.egr.uh.edu/episode/3099 The 1999 Nobel Prize in Physics ('t Hooft & Veltman, renormalization) — https://www.nobelprize.org/prizes/phy... Nobel Prize for Physics 1999 (CERN Courier) — https://cerncourier.com/a/nobel-prize... Lorenz — Deterministic Nonperiodic Flow (1963) — https://journals.ametsoc.org/view/jou... Chaos at Fifty — https://arxiv.org/pdf/1306.5777 — Disclaimer: Nap Theory is an education and relaxation channel. Factual material is based on peer-reviewed research and official scientific bodies; any speculation, fringe theory, or personal analysis is identified as such when it appears. This is not a news channel. Viewer discretion advised. #DimensionalityOfSpace #WhyThreeDimensions