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

📺 VIDEO VERSION

https://youtu.be/JGYHwpsMQ1w

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