Modeling dwarf galaxies to probe the early universe with Dr. Eric Andersson

How do we study processes that take billions of years to unfold? Here, we venture back into the cosmos with Dr. Eric Anderson, a postdoctoral researcher at the American Museum of Natural History, to discuss how numerical simulations allow us to "watch" the birth and growth of galaxies. We break down the balance between gravity and thermal pressure, the mysterious "quenching" of star formation during the Epoch of Reionization, and why dwarf galaxies are the perfect laboratories for studying the early universe.We go behind the scenes of the research process, discussing the sheer computational power required to run "Inferno" simulations, the transition from CPUs to GPUs, and the reality of the million-hour supercomputing run.Inside the EpisodeBlueprint of a Galaxy: Gas, dust, stars, and dark matter that form the building blocks of the universe.Star Formation Mechanics: Tug-of-war between gravitational collapse and thermal pressure.Epoch of Reionization: Understanding how ultraviolet radiation from the first stars "quenched" star formation in low-mass galaxies.Research Process & Simulation: How "zoom-in" simulations study isolated dwarf galaxies in high resolution.Dark Matter Halos: Comparing dynamical mass vs. visual mass and the necessity of the Cold Dark Matter paradigm.Runaway Stars: How rogue stars are kicked out of clusters at high velocities, impacting their host galaxies.Chapters(00:00) Redshift Jokes and Cosmic Escapism(01:45) The Big Bang and the First 13.8 Billion Years(04:00) Guest Dr, Eric Anderson(06:10) Career Paths: Carpentry to Physics(07:45) Star Formation: Gravity vs Thermal Pressure(11:00) Building Galaxies: The Hierarchical Model(13:10) Andromeda and the Future of the Milky Way(14:50) The Epoch of Reionization Explained(18:50) Star Formation Quenching in Dwarf Galaxies(21:00) Ultra-Faint Dwarfs: Relics of the Early Universe(26:30) Simulation Runtimes and Supercomputing(29:40) Modeling Individual Stars vs Populations(33:00) The Million-Hour Run: Supercluster Ethics(35:45) Runaway Stars and Rogue Interstellar Travel(38:30) Negative Feedback: How Stars Regulate Growth(42:50) Dark Matter Halos: The Discrepancy in Mass(46:50) Zoom-in Simulations and Initial Conditions(48:50) The Inferno Model and Stochastic Randomness(53:30) Future: GPUs and Machine Learning(55:40) Traveling Light: The Photon Science JokeLinksSupport: PateronEmail: [email protected]: Bluesky | Instagram | FacebookWhimsical Wavelengths: Deep-dive conversations where a working scientist unpacks how we know what we know, one paper, one idea, or whimsical detour at a time. Hosted by Dr. Jeffrey Zurek (P.Geo).