Hacking The Cosmological Distance Ladder

Video Description

There is a disagreement in measurements of the Hubble constant often referred to as The Crisis in Cosmology. One way to solve it is to observe redshift drift. However, it requires lengthy observations. But my guest, Dr Geraint Lewis, has a hack up his sleeve — gravitational lensing. 👉 Redshift Drift story on Universe Today: https://www.universetoday.com/162845/a-new-way-to-measure-the-expansion-rate-of-the-universe-redshift-drift/ 👉 The Redshift Difference in Gravitational Lensed Systems: A Novel Probe of Cosmology: https://arxiv.org/abs/2308.07529 👉 Dr Geraint Lewis' website: https://www.geraintflewis.com/ 👉 Twitter/X: https://twitter.com/Cosmic_Horizons 🦄 Support us on Patreon: https://patreon.com/universetoday 📚 Suggest books in the book club: https://www.goodreads.com/group/show/1198440-universe-today-book-club 00:00:00 Intro 00:01:41 Understanding the expansion of the Universe 00:03:10 Hubble Tension and Crisis in Cosmology 00:05:53 Cosmic ladder of distances 00:17:30 CMB measurements 00:24:47 The Boring Solution 00:31:10 The Exciting Solution 00:37:25 Red Shift Drift 00:48:05 Time machine for free 00:54:14 Perfect solution with unlimited funds 00:57:05 Advice for young astronomers 01:03:44 Outro 📰 EMAIL NEWSLETTER Read by 60,000 people every Friday. Written by Fraser. No ads. Subscribe for Free: https://universetoday.com/newsletter 🎧 PODCASTS Universe Today: https://universetoday.fireside.fm/ Astronomy Cast: http://www.astronomycast.com/ 🤳 OTHER SOCIAL MEDIA Twitter: https://twitter.com/fcain Twitter: https://twitter.com/universetoday Facebook: https://facebook.com/universetoday Instagram: https://instagram.com/universetoday 📩 CONTACT FRASER [email protected] ⚖️ LICENSE Creative Commons Attribution 4.0 International (CC BY 4.0) You are free to use my work for any purpose you like, just mention me as the source and link back to this video.