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Roger Penrose: Infinite Cycles of the Universe Punctuated by Big Bang Singularities
7 segments available
Full episode with Roger Penrose (Mar 2020): https://www.youtube.com/watch?v=orMtwOz6Db0 Clips channel (Lex Clips): https://www.youtube.com/lexclips Main channel (Lex Fridman): https://www.youtube.com/lexfridman (more links below) Podcast full episodes playlist: https://www.youtube.com/playlist?list=PLrAXtmErZgOdP_8GztsuKi9nrraNbKKp4 Podcasts clips playlist: https://www.youtube.com/playlist?list=PLrAXtmErZgOeciFP3CBCIEElOJeitOr41 Podcast website: https://lexfridman.com/ai Podcast on Apple Podcasts (iTunes): https://apple.co/2lwqZIr Podcast on Spotify: https://spoti.fi/2nEwCF8 Podcast RSS: https://lexfridman.com/category/ai/feed/ Roger Penrose is physicist, mathematician, and philosopher at University of Oxford. He has made fundamental contributions in many disciplines from the mathematical physics of general relativity and cosmology to the limitations of a computational view of consciousness. Subscribe to this YouTube channel or connect on: - Twitter: https://twitter.com/lexfridman - LinkedIn: https://www.linkedin.com/in/lexfridman - Facebook: https://www.facebook.com/lexfridman - Instagram: https://www.instagram.com/lexfridman - Medium: https://medium.com/@lexfridman - Support on Patreon: https://www.patreon.com/lexfridman
Segments Timeline
The Universe's Exponential Expansion
Roger Penrose discusses the concept of exponential expansion in the universe, a phenomenon discovered through supernovae observations. He reflects on Einstein's introduction of the cosmological constant, initially intended to create a static universe, which ironically turned out to be correct as the universe expands. This segment sets the stage for understanding the future of the universe and the implications of black holes.
"but word is the conformal cyclic cosmology of yeah we're starting to talk about something before yes that's singular a big and I was just thinking of myself how boring this universe is going to be you..."
The Fate of Black Holes
In this segment, Penrose elaborates on the eventual fate of black holes as they consume galaxies and ultimately evaporate through Hawking radiation. He paints a picture of a future where black holes dominate the universe, leading to a cold, empty cosmos devoid of activity. This bleak outlook raises questions about the nature of existence in a universe that becomes increasingly boring over time.
"actually right very ironic and so the universe seems to be behaving with this cosmological constant okay so this universe is expanding and expanding what's going to happen in the future well it gets m..."
Photons and the Concept of Infinity
Penrose introduces the idea that while the universe may become boring for massive entities, photons will continue to exist and travel through space. He discusses the implications of relativity on photons and their experience of infinity, suggesting that for massless particles, infinity is just another place. This segment explores the philosophical and mathematical aspects of infinity in the context of the universe.
"black holes it's colder and colder and colder and colder than ever this is very very boring now that's not science is it but it's it's emotional so I thought who's going to be bored by this universe n..."
Mathematics and Physical Reality
In this thought-provoking segment, Penrose connects mathematical concepts of infinity with physical reality. He discusses how different geometries, such as Euclidean and hyperbolic, can represent infinity and how these ideas can be applied to understand gravitational radiation. This exploration highlights the intersection of mathematics and physics in conceptualizing the universe.
"there's something on the other side is there the usual view it's just a mathematical notion there's nothing on the other side that's just the boundary of it a nice example is this beautiful series of ..."
The Big Bang and Remote Future
Penrose contrasts the conditions of the universe at the Big Bang with its remote future, suggesting that both extremes can be understood through conformal scaling. He posits that despite their apparent differences, the dense, hot state of the Big Bang and the cold, rarefied future are fundamentally connected. This segment challenges conventional views of time and space in cosmology.
"but yeah you just have to take my word for it now one of the things is you see you are taking Euclidian geometry well it just keeps on keeps on keeps on going and it goes out to infinity now there are..."
Signals from Previous Eons
In this segment, Penrose discusses the possibility of signals traveling from one eon to another, particularly through gravitational waves generated by black hole collisions. He raises intriguing questions about the nature of communication across cosmic cycles and the implications for our understanding of intelligent life in the universe.
"this a very useful way of talking about radiation gravitational radiation and things like that it was a trick mathematical trick so no what I'm saying is that that mathematical trick becomes real that..."
The Fermi Paradox and Cosmic Communication
Penrose delves into the Fermi Paradox, questioning why we haven't detected signals from intelligent civilizations if the universe is cyclical. He speculates on the potential for advanced civilizations to communicate across eons and the challenges we face in recognizing such signals. This segment invites listeners to consider the broader implications of life and communication in an ever-evolving universe.
"older than that still 20th century only just max planck e equals H nu nu is a frequency H is a constant again Lexie E is energy energy and frequency are equivalent put the two together energy and mass..."