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In this video I explain why I think it’s wrong to believe that the speed of light is an impossible to overcome limit. I am afraid that this is the biggest mistake that physicists are making, that indeed our entire species is making. And it’s all due to physicists’ misunderstanding quantum mechanics.
What do we mean with the ‘Big Bang’? Why are the properties of our universe so special? What is cosmological inflation? How can we test cosmological inflation and what do the latest observations tell us? Can we probe string theory using cosmology?
How did our universe come into existence? This basic and ancient question still remains one of the biggest mysteries in science. Ever since Einstein discovered that gravity can be understood as the stretching and bending of space and time, cosmology, which studies the properties, evolution and origin of the universe as a hole, became a proper and honest scientific subject, in which theoretical constructs can be confronted with (cosmological) observations.
What we have learned since then, in less than a century, about the origin and properties of our universe, is spectacular and at the same time mysterious. Our universe appears to be very special. In an attempt to explain these remarkable features a small group of theoretical cosmologists developed the paradigm of cosmological inflation in the eighties. What is cosmological inflation? An what do the latest observations tell us about this fascinating proposal in which all structures in our universe find their origin in small primordial quantum fluctuations? And what are the implications of cosmological inflation for conjectured theories of quantum gravity, such as string theory?
String theorist Jan Pieter van der Schaar argues that cosmology in general, and the cosmological paradigm of inflation in particular, is our best (and perhaps only) bet to probe and test the microscopic quantum description of space and time.
An Pieter van der Schaar is a string theorist by training, with a Ph.D. at the University of Groningen in 2000. After postdoctoral research stints at the University of Michigan, the Cern theory group, and Columbia University, he developed into a theoretical cosmologist with a particular interest to connect cosmological models to string theory and vice versa. Jan Pieter has been a member of the string theory and cosmology group at the Institute of Physics of the University of Amsterdam since 2006. Since 2013 he is the coordinator of the Delta Institute for Theoretical Physics and as of 2022 he is heading the ‘Building Blocks of Matter and Foundations of Space-time’ route as part of the Nationale Wetenschapsagenda.
🚨 THE UNIVERSE NEVER FORGETS. NOT A SINGLE MOMENT. You burned a book. The words are gone. The pages are ash. But physics says every letter still exists — scattered across trillions of particles, encoded in the quantum state of reality. And it’s not just books. Every breath you’ve ever taken. Every word you’ve ever spoken. Every person you’ve ever lost. The information is still here. Right now. Permanently. 🔴 WHAT YOU’LL DISCOVER: 🔴 Why burning something doesn’t destroy its information. 🔴 How Stephen Hawking lost the biggest bet in physics history. 🔴 The black hole war that nearly broke quantum mechanics. 🔴 Why spacetime itself is made of information. 🔴 What this means about death — and why nothing truly disappears. ⚠️ WARNING: After this video, you will never look at destruction the same way again. Like and subscribe for more reality-breaking physics. physics, quantum mechanics, information paradox, black holes, Hawking radiation, holographic principle, entropy, universe, science, reality, quantum information, spacetime, Leonard Susskind, Stephen Hawking, ER EPR.
Sabine Hossenfelder, Ivette Fuentes and James Ladyman discuss the scaling laws of the universe and the fundamental nature of reality.
Is the universe one thing, or many things?
With a free trial, you can watch the full debate NOW at https://iai.tv/video/the-one-and-the–… central question in ancient Greek philosophy was the problem of the One and the Many. It is a question that has echoed across Western culture and is still with us today. Should we see the world as a coherent whole or a multitude of separate parts? The puzzle is that we need both the whole and the parts, but an explanation of the relationship between them has proved problematic and perhaps unknowable. In contemporary physics, the parts are the teeming world of particle physics, and these should make up the cosmological world of the universe as a whole and the overall framework of Einsteinian space-time. But as yet we have not been able to combine the two coherently. Is looking at the universe from the small scale and the large always going to be incompatible? Does it mean a theory of everything is an illusion and the attempt to combine quantum mechanics and Einstein’s general relativity a forlorn project? Or is the parallel with the ancient Greek puzzle accidental and the current challenge one that might be overcome? #quantumphysics #universe #philosophy #fundamentalunits #theoryofeverything Sabine Hossenfelder is a theoretical physicist and acclaimed science communicator, known for her sharp critiques of the scientific mainstream. She is also a best-selling author and YouTuber. Ivette Fuentes is a theoretical quantum physicist at the University of Southampton and Emmy Fellow at the University of Oxford. James Ladyman is a philosopher of science at the University of Bristol. He is best known for his book Every Thing Must Go, calling for a metaphysics grounded in physics and complexity science. Hosted by Jack Symes. 00:40 James Ladyman on the different notions of scale 02:39 Sabine Hossenfelder on energy in the universe 05:19 Ivette Fuentes on unifying quantum mechanics and general relativity 09:00 Is the universe “One” or “Many”? 17:15 Particles are not fundamental The Institute of Art and Ideas features videos and articles from cutting edge thinkers discussing the ideas that are shaping the world, from metaphysics to string theory, technology to democracy, aesthetics to genetics. Subscribe today! https://iai.tv/subscribe?utm_source=Y… For debates and talks: https://iai.tv For articles: https://iai.tv/articles For courses: https://iai.tv/iai-academy/courses.
A central question in ancient Greek philosophy was the problem of the One and the Many. It is a question that has echoed across Western culture and is still with us today. Should we see the world as a coherent whole or a multitude of separate parts? The puzzle is that we need both the whole and the parts, but an explanation of the relationship between them has proved problematic and perhaps unknowable. In contemporary physics, the parts are the teeming world of particle physics, and these should make up the cosmological world of the universe as a whole and the overall framework of Einsteinian space-time. But as yet we have not been able to combine the two coherently.
Is looking at the universe from the small scale and the large always going to be incompatible? Does it mean a theory of everything is an illusion and the attempt to combine quantum mechanics and Einstein’s general relativity a forlorn project? Or is the parallel with the ancient Greek puzzle accidental and the current challenge one that might be overcome?
A radical idea that resolves many quantum paradoxes suggests there is no objective view of reality. How can the cosmos be stitched together from interlocking perspectives?
2025 is … was the international year of quantum science and technology. Yes because quantum tech is increasingly important, but especially because quantum mechanics was invented 100 years ago this year. In 1925, our strangest true theory went from being a peculiar set of ideas to describe some funny results from experiments, to a full-blown theoretical framework that overturned how we think reality really works. So today, as the centenary year approaches its end I want to take you on a little journey through what may be the most paradigm-destroying several months in scientific history.
A huge thanks to our Ho’oleilana Patreon supporters — James Keller, Unpunnyfuns, Ramsay Chambers, Matthew Williams and Mike Cumings, Jr.
Footage from Videoblocks, Artlist. Other footage from NASA and ESO. Music from Epidemic Sound, Artlist, Silver Maple and Yehezkel Raz. Images of scientists frequently from the AIP Icons from The Noun Project. Quantum Fluctuations by Derek Leinweber.
00:00 Introduction. 04:18 Will The Universe Go On Forever? 17:42 What Lingers In The Long Night? 33:20 What Would It Mean? 46:20 Everything Everywhere
