Parallel Worlds Probably Exist. Here’s Why

Watch on YouTube

Show annotations

Download is disabled.

3,835,160

133,621

4,997

Genre: Education

Family friendly? Yes

Wilson score: 0.963

Rating: 4.8558 / 5

Engagement: 3.61%

Veritasium

Subscribe | 7.08M

Shared March 6, 2020

The most elegant interpretation of quantum mechanics is the universe is constantly splitting
A portion of this video was sponsored by Norton. Get up to 60% off the first year (annually billed) here: https://bit.ly/32SM0yd or use promo code VERITASIUM

Special thanks to:
Prof. Sean Carroll https://www.preposterousuniverse.com
His book, a major source for this video is 'Something Deeply Hidden: Quantum Worlds and The Emergence of Spacetime'

Code for solving the Schrödinger equation by Jonny Hyman available here: https://github.com/jonnyhyman/Quantum...

I learned quantum mechanics the traditional 'Copenhagen Interpretation' way. We can use the Schrödinger equation to solve for and evolve wave functions. Then we invoke wave-particle duality, in essence things we detect as particles can behave as waves when they aren't interacting with anything. But when there is a measurement, the wave function collapses leaving us with a definite particle detection. If we repeat the experiment many times, we find the statistics of these results mirror the amplitude of the wave function squared. Hence the Born rule came into being, saying the wave function should be interpreted statistically, that our universe at the most fundamental scale is probabilistic rather than deterministic. This did not sit well with scientists like Einstein and Schrödinger who believed there must be more going on, perhaps 'hidden variables'.

In the 1950's Hugh Everett proposed the Many Worlds interpretation of quantum mechanics. It is so logical in hindsight but with a bias towards the classical world, experiments and measurements to guide their thinking, it's understandable why the founders of quantum theory didn't come up with it. Rather than proposing different dynamics for measurement, Everett suggests that measurement is something that happens naturally in the course of quantum particles interacting with each other. The conclusion is inescapable. There is nothing special about measurement, it is just the observer becoming entangled with a wave function in a superposition. Since one observer can experience only their own branch, it appears as if the other possibilities have disappeared but in reality there is no reason why they could not still exist and just fail to interact with the other branches. This is caused by environmental decoherence.

Schrodinger's cat animation by Iván Tello
Wave functions, double slit and entanglement animation by Jonny Hyman
Filming of opening sequence by Casey Rentz

Special thanks to Mithuna Y, Raquel Nuno and Dianna Cowern for feedback on the script

Music from https://epidemicsound.com "Experimental 1" "Serene Story 2" "Seaweed" "Colorful Animation 4"



57:02

Planet Nine from Outer Space - K. Batygin - 12/7/2016

365K views

1:22:35

Multiverse: One Universe or Many?

986K views

1:43:58

Infinite Worlds: A Journey through Parallel Universes

1.1M views

3:00:57

Joe Rogan Experience #606 - Randall Carlson

7M views

1:29:58

Sean Carroll: Quantum Mechanics and the Many-Worlds Interpretation | Artificial Intelligence Podcast

217K views

14:49

The Bizarre Behavior of Rotating Bodies, Explained

4.8M views

2:00:59

2016 Isaac Asimov Memorial Debate: Is the Universe a Simulation?

3.8M views

58:34

The Year of Pluto - New Horizons Documentary Brings Humanity Closer to the Edge of the Solar System

9M views

16:20

Does Planet 9 Exist?

3.1M views

1:22:42

A mind-expanding tour of the cosmos with Neil deGrasse Tyson and Robert Krulwich

2.9M views

1:00:18

Quantum Fields: The Real Building Blocks of the Universe - with David Tong

2.5M views

1:39:21

The Matter Of Antimatter: Answering The Cosmic Riddle Of Existence

1.7M views

46:09

String Theory and the End of Space and Time with Robbert Dijkgraaf

770K views

12:51

The Science Behind the Butterfly Effect

1.7M views

11:56

Did The Past Really Happen?

12M views

1:22:22

The Magic of Chemistry - with Andrew Szydlo

4.3M views

18:39

This equation will change how you see the world (the logistic map)

5M views

8:58

Do we live in a multiverse? | The Economist

2.5M views

42:25

Are There Many Worlds? With Sean Carroll

126K views