Are We Wrong About the Big Bang? Niayesh Afshordi

Video Description

Get Dr. Brian Keating’s NEW Book for Only 0.99! This week only: https://a.co/d/hi50U9U For over a century, cosmologists have believed that the universe began in a single fiery moment. The Big Bang. But what if that story is incomplete? Or what if it's even wrong? My guest today, Professor Niayesh Afshordi, is a professor of astrophysics at the Perimeter Institute and the University of Waterloo. He and his colleague Phil Halper argue that the real battle in science is over the mysteries of singularities, those points where our equations collapse and space, time and physics itself seem to break down. In a new book, Battle of the Big Bang, they take us inside the fight to understand whether the Big Bang was truly the beginning of it all, or whether it was just one chapter in a far stranger cosmic saga. KEY TAKEAWAYS 00:00:00 – Many cosmologists no longer see the Big Bang as the beginning of time 00:11:01 – Distinction between the singularity and the later hot Big Bang phases like nucleosynthesis 00:12:13 – Survey of physicists shows “Big Bang” is understood differently, often just meaning a hot dense early universe 00:15:37 – Hawking and singularities: the idea of singularities is more illusion than physical reality 00:23:12 – Black hole information paradox remains unresolved after 50 years .00:30:26 – Religion remains a social tool, bringing both benefits and risks 00:35:56 – The Simons Observatory was created to probe primordial gravitational waves in the CMB 00:39:50 – Scientific careers are constrained by funding and “hot topics” in research 00:41:17 – Science advances by tying ideas to observation, not just social structures 00:42:07 – Disagreement with Carlo Rovelli over loop quantum gravity predictions 00:44:54 – Competing quantum gravity models are ideas, not fully testable theories yet 00:46:14 – String theory, loop quantum gravity, and holography lack experimental evidence 00:47:55 – Cancellation of CMB Stage-4 highlights limits of experimental cosmology 00:49:14 – Afshordi views himself closer to an observer than a pure theorist 00:54:51 – Scientific progress benefits from bridging between communities like astronomy and quantum gravity 00:57:47 – Repulsive gravity in inflation avoids singularities but leaves open loopholes 01:01:00 – The assumptions of singularity theorems can break down with quantum gravity or altered dimensions 01:03:05 – One idea is that our universe itself was born inside a black hole 01:06:16 – Future probes like neutrinos and gravitational waves might let us see further back than the CMB 01:10:56 – Einstein unknowingly started the quest for quantum gravity, but his static universe bias lingers ----------------------------------------------------------------------------------------- Additional resources: Get Niayesh Afshordi’s book: https://www.amazon.com/Battle-Big-Bang-Cosmic-Origins/dp/0226830470 Get Dr. Brian Keating’s NEW Book for Only 0.99! This week only: https://www.amazon.com/dp/B0FN8DH6SX?ref_=pe_93986420_775043100 Please join my mailing list here 👉 https://briankeating.com/yt to win a meteorite 💥 ----------------------------------------------------------------------------------------- Join this channel to get access to perks like monthly Office Hours: https://www.youtube.com/channel/UCmXH_moPhfkqCk6S3b9RWuw/join 📚 Get a copy of my books: Think Like a Nobel Prize Winner, with life changing interviews with 9 Nobel Prizewinners: https://a.co/d/03ezQFu My tell-all cosmic memoir Losing the Nobel Prize: http://amzn.to/2sa5UpA The first-ever audiobook from Galileo: Dialogue Concerning the Two Chief World Systems: Ptolemaic and Copernican https://a.co/d/iZPi9Un 📺 Watch my most popular videos:📺 Neil Turok https://www.youtube.com/watch?v=Dt5cFLN65fI Frank Wilczek https://youtu.be/3z8RqKMQHe0?sub_confirmation=1 Eric Weinstein vs. Stephen Wolfram https://www.youtube.com/watch?v=OI0AZ4Y4Ip4?sub_confirmation=1 Sir Roger Penrose: https://youtu.be/AMuqyAvX7Wo Sabine Hossenfelder: https://youtu.be/g00ilS6tBvs Avi Loeb: https://youtu.be/N9lUceHsLRw Follow me to ask questions of my guests: 🏄‍♂️ Twitter: https://twitter.com/DrBrianKeating 🔔 Subscribe https://www.youtube.com/DrBrianKeating?sub_confirmation=1 📝 Join my mailing list; just click here http://briankeating.com/list ✍️ Detailed Blog posts here: https://briankeating.com/blog 🎙️ Listen on audio-only platforms: https://briankeating.com/podcast #universe #podcast #briankeating #intotheimpossible #science #astronomy #cosmology #cosmicmicrowavebackground #intotheimpossible #briankeating #NiayeshAfshordi