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Mind the Gap: Will Tiny Discrepancies Derail Cosmology?

Renowned astrophysicist and educator Alex Filippenko joins Brian Greene to discuss an increasingly disturbing cosmological mismatch known as the Hubble Tension, a gap that may require a radical rewriting of the history of the universe. This program is part of the Big Ideas series, supported by the John Templeton Foundation. Participant: Alex Filippenko Moderator: Brian Greene 0:00:00 - Introduction 0:00:50 - Welcome to Alex Filippenko 0:03:58 - The Most Important Lesson of Science 0:06:47 - The Hubble Tension 0:12:04 - Measuring the Expansion Rate of the Universe 0:23:31 - How far out can we measure? 0:27:10 - Galaxies with Type 1A Supernovae and Cepheids 0:32:57 - Cosmic Distance Ladder Summary 0:37:30 - The Universe's Expansion Rate Today 0:47:20 - How can we be certain the measurements are correct? 0:51:00 - CMB and using Theoretical Models to Extrapolate the Expansion Rate 1:00:57 - Positive outcomes to this tension 1:02:14 - Filippenko's thoughts on the position of Wendy Freedman's recent paper 1:14:09 - Will the Cepheid data set remain at 42? 1:16:55 - Filippenko's thoughts on the Hubble tension 1:22:40 - How Cosmology became a precision science 1:25:11 - Is Inflation a Falsifiable Theory? 1:29:30 - Filippenko's view of Inflation and the Multiverse 1:31:08 - Filippenko's view of Cyclic Inflation and Steinhardt and Penrose's theories 1:35:15 - Falsifiable Aspects of Inflation 1:41:54 - Discovering the Accelerated Expansion of the Universe 1:47:54 - Filippenko's thoughts on Saul Perlmutter's team's analysis methods 1:50:47 - Filippenko's reaction to the initial discovery 1:59:04 - Thoughts on Dark Energy and the Great Rip 2:01:58 - Conclusion 2:03:16 - Credits VISIT our Website: http://www.worldsciencefestival.com FOLLOW us on Social Media: Facebook: / worldsciencefestival Twitter: / worldscifest Instagram:   / worldscifest   TikTok:   / worldscifest   LinkedIn:   / world-science-festival   #worldsciencefestival #briangreene #cosmology #astrophysics #alexfilippenko #bigbang #hubbletension #cosmicinflation #cosmicmicrowavebackground #multiverse #bigrip #darkenergy

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