What Physics Still Can't Explain About Time

Hey guys! We’re now live on Spotify🎧 Listen here: https://open.spotify.com/show/1Nm0Qc8... There is a clock somewhere near you right now, and you trust it completely — the past gone, this moment real, another on the way. We can measure time to eighteen decimal places, yet no one can say what the thing we are measuring actually is. So what happens when our two greatest theories of reality are finally forced to agree about it? Tonight we walk slowly from Newton's river to Einstein's bending time to the single equation for the whole universe in which time quietly disappears. Get comfortable, close your eyes, and let this slow walk through the physics of time keep you company tonight. Subscribe to Nap Theory if you enjoy taking the long way around the universe. CHAPTERS 0:00 Introduction 1:21 The clock you never question 11:19 Newton's absolute river 22:20 Einstein takes the stage away 34:45 The direction not in the rules 46:30 Where the arrow of time hides 57:18 The question underneath 1:07:30 Two theories, two times collide 1:19:35 The equation that freezes 1:33:05 Evolution without evolution 1:43:57 Time from heat 1:55:42 What still won't close 2:05:42 What physics cannot explain SOURCES DeWitt, Quantum Theory of Gravity I: The Canonical Theory (Phys. Rev. 160, 1113, 1967) — https://link.aps.org/doi/10.1103/Phys... Page & Wootters, Evolution without evolution (Phys. Rev. D 27, 2885, 1983) — https://link.aps.org/doi/10.1103/Phys... Connes & Rovelli, Von Neumann algebra automorphisms and time-thermodynamics relation (Class. Quantum Grav. 11, 2899, 1994) — https://iopscience.iop.org/article/10... Moreva et al., Time from quantum entanglement: an experimental illustration (Phys. Rev. A 89, 052122, 2014) — https://link.aps.org/doi/10.1103/Phys... Moreva et al., Time from quantum entanglement (preprint) — https://arxiv.org/abs/1310.4691 Isham, Canonical Quantum Gravity and the Problem of Time (1992) — https://arxiv.org/abs/gr-qc/9210011 Anderson, The Problem of Time in Quantum Gravity (review) — https://arxiv.org/pdf/1009.2157 Rovelli, "Forget time" (FQXi Nature of Time essay, 2009) — https://arxiv.org/abs/0903.3832 Rovelli, Notes for a brief history of quantum gravity — https://arxiv.org/pdf/gr-qc/0006061 Stanford Encyclopedia of Philosophy, Thermodynamic Asymmetry in Time — https://plato.stanford.edu/entries/ti... Canonical Quantum Gravity (overview) — https://en.wikipedia.org/wiki/Canonic... — 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. #ProblemOfTime #QuantumGravity