Goodbye to Dark Matter - Dr. Raj Gupta, Cosmologist, DSPod #249

The DemystifySci Podcast

Dr. Rajendra Gupta is a physics professor at the University of Ottawa who was in the headlines a few months ago for his assertion that the universe might be at least twice as old as we realize. He’s back at the radical reshaping of physics with his latest paper, which proposes that we can do away with dark matter and dark energy. Currently, these invisible substances are thought to make up something like 70-90% of our universe, depending on who you ask. But they’re invisible, undetectable, placeholders for some force or particle that can make the math work out. As an alternative, Gupta proposes modeling the universe with two ideas in mind. One, that the constants of nature are not, in fact, constant and two, that the red light shift seen in the cosmos that is considered to be a signature of expansion is actually the fingerprint of “tired light.” Together, these concepts allow him to recalculate the mechanics of the universe without relying on dark matter and dark energy, which is pretty cool. We talk about the impetus for this work, the meaning of tired light, why expansion isn’t going away any time soon, and the future of physics. Tell us your thoughts in the comments!!! Sign up for our Patreon and get episodes early + join our weekly Patron Chat https://bit.ly/3lcAasB Read more about Dr. Gupta's recent papers: https://iopscience.iop.org/article/10.3847/1538-4357/ad1bc6 https://www.uottawa.ca/about-us/media/news/new-research-suggests-our-universe-has-no-dark-matter 00:00 Go! 00:02:35 Moving the age of the universe 00:07:37 Supernovas as standard candles 00:19:16 What does it mean for the universe to expand? 00:28:51 Is Dark Matter on the way out? 00:38:01 Variable evolution of the universe & galactic formation 00:47:07 Where did tired light go wrong in Hoyle's day? 00:57:49 How does tired light solve the problem of galaxies in the early universe? 01:06:46 Alternative causes of gravitational lensing 01:16:16 Why gravity is the end all be all 01:22:59 What causes light to be tired? 01:30:23 What's left to learn about light? 01:37:58 Closing thoughts #sciencepodcast #DarkMatterAlternative #TiredLightTheory #VaryingCosmicConstants #RedefiningCosmology #RajendraGuptaPhysics #UnconventionalUniverse #ChallengingPhysicsParadigms #RadicalCosmologicalModels #TwistOnExpansion #ReshapingPhysics Check our short-films channel, @DemystifySci: https://www.youtube.com/c/DemystifyingScience AND our material science investigations of atomics, @MaterialAtomics https://www.youtube.com/@MaterialAtomics Join our mailing list https://bit.ly/3v3kz2S PODCAST INFO: Anastasia completed her PhD studying bioelectricity at Columbia University. When not talking to brilliant people or making movies, she spends her time painting, reading, and guiding backcountry excursions. Shilo also did his PhD at Columbia studying the elastic properties of molecular water. When he's not in the film studio, he's exploring sound in music. They are both freelance professors at various universities. - Blog: http://DemystifySci.com/blog - RSS: https://anchor.fm/s/2be66934/podcast/rss - Donate: https://bit.ly/3wkPqaD - Swag: https://bit.ly/2PXdC2y SOCIAL: - Discord: https://discord.gg/MJzKT8CQub - Facebook: https://www.facebook.com/groups/DemystifySci - Instagram: https://www.instagram.com/DemystifySci/ - Twitter: https://twitter.com/DemystifySci MUSIC: -Shilo Delay: https://g.co/kgs/oty671