Why the Universe Is Expanding: Dark Energy, Cosmology & General Relativity | Bharat Ratra Inspire Us

Description

Bharat Ratra is a distinguished Physicist and Professor of Physics at Kansas State University and a leading cosmologist. He is best known for co-proposing the first dynamical dark energy model in 1988, a foundational idea that helps explain the accelerating expansion of the universe. In this conversation we explore the biggest mysteries in modern cosmology: dark energy, the nature of the universe’s expansion, inflation, and what we still don’t understand about the cosmos. We discuss how our understanding of dark energy might evolve over time and what recent observations might mean for our fundamental of reality. It was an absolute pleasure and privilege to speak with Professor Ratra. We hope you enjoy this conversation. The episode is available now on YouTube and all podcast platforms. What are your biggest questions about the universe? Subscribe to Youtube: www.youtube.com/@InspireUsPodcast Listen on Spotify: https://open.spotify.com/show/4WAeOo2e2Xf6qOFD1ZagXF?si=c9aeead4dc6847f9 Apple Podcast: https://podcasts.apple.com/us/podcast/inspire-us-podcast/id1732848248 Follow us on social media: X: https://x.com/InspireUsPod Instagram: https://www.instagram.com/inspireuspodcast/ TikTok: https://www.tiktok.com/@inspireuspodcast Chapters 00:00 Intro 00:00:39 How Space Itself Is Being Created 00:05:01 Why We Don’t Notice the Universe Expanding 00:10:56 Einstein, Gravity & the Deformation of Space-Time 00:13:10 Under-dense Regions & the Creation of Space 00:15:03 The Dark Matter Problem in Galaxies 00:19:59 Why Modified Newtonian Dynamics Doesn’t Fully Work 00:25:20 The Cosmological Constant & Accelerating Expansion 00:35:00 Quintessence: A Dynamic Alternative to Dark Energy 00:39:55 The James Webb Telescope & New Data 00:43:44 Inflation, Higgs Field & the Early Universe 00:49:00 The Future of Cosmology: What Excites Bharat Ratra 00:58:05 Why Quantum Mechanics & General Relativity Don’t Reconcile 01:07:47 Closing Thoughts