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Foundations & Mysteries of Modern Cosmology | Brian Greene & Matias Zaldarriaga

World Science Festival

71,987 views

Leading cosmologist Matias Zaldarriaga joins Brian Greene to explore the stunning insights -- and the remaining mysteries -- of modern cosmological thought.

This program is part of the Rethinking Reality series, supported by the John Templeton Foundation.

Participant: Matias Zaldarriaga
Moderator: Brian Greene

#worldsciencefestival #briangreene #cosmology #astrophysics

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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:
0:00:00 - Introduction
0:01:31 - Early Life & Inspirations
0:04:03 - CMB Breakthroughs in the 1990s
0:06:06 - CMBfast and Open Source Impact
0:09:10 - How CMB Redefined Cosmology
0:12:09 - Theory vs. Observation in Physics
0:15:04 - The Inflation Debate
0:20:21 - The Multiverse & Scientific Boundaries
0:24:26 - Gravitational Waves & Cosmic Clues
0:27:39 - The BICEP2 False Alarm
0:33:40 - The Hubble Tension Explained
0:41:49 - From CMB to Gravitational Wave Physics
0:55:29 - Pulsar Timing Arrays & the Cosmic Hum
1:11:26 - AI and the Future of Cosmology

Foundations & Mysteries of Modern Cosmology | Brian Greene & Matias Zaldarriaga
@worldsciencefestival

20 Comments

@-tarificpromo-7196 1 year ago

Brian Greene, the epitome of the era’s physics communication.

@Moudabo 1 year ago

It's amazing how many people's lives were impacted by the great Carl Sagan, through Cosmos and his other work. I'm glad Prof. Matias was one such person, and now we get to hear his insights and learn about his contributions. Thanks for another interesting discussion, Brian.

@my-trivia-adventure-en 4 months ago (edited)

I am outraged by the low engagement here: only 1k likes on an 9-month-old video for a channel with 1.4M subscribers! I suspect Professor Greene is too much of a gentleman to constantly beg for likes and subs, but this level of insight deserves so much more traction. Let's boost this, people! We should be showing more appreciation for content this deep or we may lose it! (03.05.2026)

@helisoma 1 year ago

@2:40 same for me...Carl Sagan through watching Cosmos when it aired was THE inspiration for me to be a scientist and even a love of life and nature and philosophy ....i ended up doing a PhD in neuroscience which relies on a lot of physics as far as the biological sciences are concerned so i found a good blend 😌🤗

@tiberiusgracchus4222 1 year ago

It's just nice these days to hear smart people have a casual conversation about literally anything. It's a welcome distraction from the absurdity of public discourse.

@Syzygy_OA 1 year ago

I've seen a lot of WSF talks that I thought might be my favorite, and this is certainly one of them.
What a wonderful perspective on inflation, observational cosmology, and the analogy to paleontology. Extremely down to earth and reasonable. Been a while since I adjusted my view so firmly.

@AzharAli-n5c 1 year ago

Great conversation

@tatotato85 1 year ago

Understood more than what i was expecting

@phillipdyson2689 1 year ago (edited)

What a beautiful man, thank you Sir for your contribution to science.

@sdiggd 1 year ago

Thank you Brian and the WSF

@flywitch26 1 year ago

Thank you 🙏

@Rafael-x4e4d 1 year ago

That was great 👍

@rabblescamp 1 year ago

I wonder if Pulsar Timing Array technology will affect considerations concerning LISA.
Off topic: I like to listen to something intelligent every morning as I get ready for the day. Needless to say, mainstream has no such thing. Anyhow, it's always SUCH a pleasure to begin my day with a Brian Greene video. Dr. Zaldarriaga provides a brilliant perspective on the "State of the Science".

@alejandroestebanclark3980 10 months ago

Muchas gracias por tu compromiso con la ciencia Matías, Sos una inspiración para muchos pibes.

@azharalibhutto1209 1 year ago

Great ❤❤❤ conversation

@markrich9600 1 year ago

Mind = blown 🤯✨

@diseasefreeforall 1 year ago

I don't know if Brian reads these comments but if he does: Your interview with Tim Maudlin, which was fantastic, made me think that you look like you are at risk for osteoporosis so having a DEXA scan done to determine bone density may be a good idea.

@jionyokaze 1 year ago

I must know, then painting off to your left, it’s amazing!

@BlaTaN 1 year ago

I much prefer the warm light in brians background. White light is nothing but FLASHBANG!

@CarolABinkley 1 year ago

I have been and will read and study the Michelson-Morley experiment. It had a significance for me at one time, and apparently I have hidden that part of it even from myself. But anyway, I read that critics have referred to it as the '...most famous failed experiment in history...' But no experiment, even one that doesn't bear out your 'preconceived notions' can be considered a failure. Every experiment, and by experiment I'm referring to a 'controlled observation' (Aristolte made many and meticulous observations, but they were not 'controlled'---he did not attempt to adjust conditions so that a question or problem would be answered) every experiment tells us something about 'reality'. The problem is that some scientists want to shape reality to 'conform' to the mathematical equations they have created to substantiate their world-view.