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We’re Here Because... Something Broke

2024-05-09 · collab / interview · John, Katie Mack · 2:55 · watch on YouTube

Topic: Science & nature · mode: Explainer · tags: self promotion, guest or collab

In a clip from the podcast Crash Course Pods: The Universe, astrophysicist Katie Mack explains to John that physicists seek to show different things are one thing seen differently: grand unified theories hold that the forces were once one until a symmetry broke in the early universe, and adding gravity would give a theory of everything.

What is said

The parts of the video and what is said in each (★ — how much it matters to the video).

00:00:00 — Katie Mack on physicists showing that different-looking things are one thing; John's novelist aside

  • ★★ Katie Mack: Katie says physicists try to show that things that look different are aspects of the same thing seen from different angles, a satisfying move like seeing two faces and a vase as one picture. — 00:00:00
  • ★ John remarks that novelists also find this very fulfilling work. (playful) — 00:00:23

00:00:28 — Simplification in physics: elements from the same particles, one force broken into many by early-universe symmetry breaking, grand unified theory vs theory of everything

  • ★★ Katie Mack: Katie says physicists always try to make things simpler: rather than many different particles, they want one kind of particle doing different things. — 00:00:28
  • ★★ Katie Mack: Katie says the discovery that the different elements are arrangements of the same fundamental particles was mind-blowing: hydrogen and carbon are just different numbers of protons, neutrons and electrons. — 00:00:39

  • ★★★ Katie Mack: Katie says grand unified theories try to show the different forces are really one force that only looks like several because we see it from a weird low-energy perspective. — 00:01:02

    “Actually, we have one force and something happened to make it look like there are different forces.”

  • ★★★ Katie Mack: Katie says something changed in the early universe that broke a symmetry: everything was nicely symmetric and perfect, then it broke, which is why there are now all these different things. — 00:01:27

  • ★★ John sums up that we are here because something broke, and Katie agrees. — 00:01:41

    “That’s why we’re here - because something broke.”

  • ★★★ Katie Mack: Katie says there are good theories unifying the strong, weak and electromagnetic forces of particle physics, but physicists have not yet managed it with gravity. — 00:01:45

  • ★★★ Katie Mack: Katie defines the terms: unifying the strong, weak and electromagnetic forces gives a grand unified theory; unifying those with gravity gives a theory of everything. — 00:02:01
  • ★ John adds that a theory of everything would explain literally everything; Katie agrees that getting gravity to work with the other forces would solve it. — 00:02:16

00:02:29 — John plugs The Universe, the new Crash Course podcast with Dr. Katie Mack

In the description and comments

Threads in this video

Mentioned

Central: Fundamental interaction · Grand Unified Theory · Katie Mack

Also: Projects: Crash Course

Works: Crash Course Pods: The Universe

Concepts: carbon · chemical element · Electromagnetism · electron · Gravity (concept) · hydrogen · neutron · proton · Rubin vase · Strong interaction · symmetry breaking · theory of everything · Weak interaction

Also centred on Katie Mack: Katie Mack Explains The Big Bang To John Green · The Weird Timescales of the Universe

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