Loop Quantum Gravity
A theory that attempts to unify general relativity and quantum mechanics by quantizing spacetime itself, suggesting it is composed of discrete loops.
Common Themes
Videos Mentioning Loop Quantum Gravity

Jeffrey Shainline: Neuromorphic Computing and Optoelectronic Intelligence | Lex Fridman Podcast #225
Lex Fridman
A theory of quantum gravity primarily worked on by Lee Smolin, aiming to unify quantum mechanics with general relativity.

Eric Weinstein: Difficult Conversations, Freedom of Speech, and Physics | Lex Fridman Podcast #163
Lex Fridman
A theory of quantum gravity, seen as growing out of hopes from the general relativistic community but lacking particle theoretic realism.

Joscha Bach: Nature of Reality, Dreams, and Consciousness | Lex Fridman Podcast #212
Lex Fridman
Mentioned as another theory of everything, focusing on a particular unification.

Cumrun Vafa: String Theory | Lex Fridman Podcast #204
Lex Fridman
An alternative theory of quantum gravity aiming to merge quantum mechanics and general relativity, described as less subtle than string theory but potentially containing nuggets of truth.

Lee Smolin: Quantum Gravity and Einstein's Unfinished Revolution | Lex Fridman Podcast #79
Lex Fridman
A theory of quantum gravity that Smolin co-invented, aiming to reconcile general relativity and quantum mechanics. It proposes that spacetime is granular and quantized.

What If Space And Time Are NOT Real?
PBS Space Time
A theory that attempts to unify general relativity and quantum mechanics by quantizing spacetime itself, suggesting it is composed of discrete loops.

The String Theory Wars and What Happened Next
Sabine Hossenfelder
An alternative approach to quantum gravity that Lee Smolin supported, but the video suggests it was not progressing.

Doctor Asks Physics Questions (ft @MedlifeCrisis)
Sabine Hossenfelder
One of the theoretical approaches physicists are exploring to reconcile quantum mechanics with general relativity.

Lisa Randall Interview (Full Episode) | The Tim Ferriss Show (Podcast)
Tim Ferriss
A theoretical framework mentioned in the context of large programs in physics that don't yet directly connect to the observable universe.