From World Science Festival.
Brian Greene and physicist Samir Mathur explore one of the deepest puzzles in modern physics, the true nature of black holes and the fate of information in the universe.
Their conversation centers on the black hole information paradox, a problem that has challenged physicists for decades. If quantum mechanics says information can never be destroyed, how can black holes once thought to erase everything that falls into them be reconciled with that principle? Mathur introduces the fuzzball theory, a proposal from string theory suggesting that black holes are not empty regions but complex structures that preserve information.
Greene and Mathur also revisit key developments in black hole physics, from entropy and Hawking radiation to modern ideas like firewalls and wormholes. They reflect on why certain approaches may fall short and whether recent theoretical insights are bringing the paradox closer to resolution. This conversation offers an engaging look at how physicists are rethinking black holes, quantum gravity, and the fundamental structure of reality.
This program is part of the Rethinking Reality series, supported by the John Templeton Foundation.
Participant: Samir Mathur
Moderator: Brian Greene
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ABOUT WORLD SCIENCE FESTIVAL:
The World Science Festival (WSF) is a multimedia organization bringing the most transformative ideas in science to global audiences. Through long- and short-form videos spanning physics, cosmology, quantum mechanics, biology, neuroscience, consciousness, medicine, space exploration, the dilemma of free will, artificial intelligence, engineering, robotics, and beyond. WSF gathers world-renowned scientists, artists, and thinkers for dynamic discussions, debates, lectures, performances, films, and immersive live experiences.
Founded in 2008 and headquartered in New York City, the World Science Festival is a production of the World Science Foundation, a 501(c)(3) nonprofit organization. Our mission is to cultivate a public informed by science, inspired by its wonder, convinced of its value, and prepared to engage with its implications for the future. With live events reaching millions worldwide and hundreds of millions of digital views, WSF continues to expand its global impact through festivals, educational initiatives like World Science U, and digital content that explores the near and far future of our world.
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Chapters:
00:00 The Fuzzball Theory: A Radical New View of Black Holes
03:06 How Black Holes Form (Einstein’s Simple Idea)
05:08 The Singularity Problem: Infinite Density Explained
07:18 “Black Holes Have No Hair” The Simplicity Paradox
09:25 Black Hole Thermodynamics & Entropy Mystery
13:18 Hawking Radiation: When Black Holes Start Evaporating
17:47 The Information Paradox That Broke Physics
22:21 Can Remnants Save Information?
26:05 Why Small Corrections Don’t Work (Key Theorem)
29:14 String Theory & Counting Black Hole States
32:14 Fuzzballs: The End of Traditional Black Holes?
34:05 How Fuzzballs Solve the Information Problem
36:34 Falling Into a Fuzzball vs a Black Hole
49:03 The Final Debate: Fuzzballs vs Non-Local Physics
58:47 Final Thoughts: What Will It Take for Consensus?
Black Holes May Not Be What We Thought | World Science Festival
https://www.youtube.com/channel/UCShHFwKyhcDo3g7hr4f1R8A
