Do We Need an UPDATED Dark Matter Model?
Summary
This episode explores the challenges facing the Cold Dark Matter model, specifically the missing satellites and cusp-core problems, and how new simulations suggest ordinary matter plays a crucial role in shaping galactic structures. While baryonic feedback from supernovae may resolve some discrepancies, new issues like the "too big to fail" problem and density diversity keep the debate alive. The discussion also examines alternative models like warm and fuzzy dark matter, noting that improved observations are increasingly constraining these theories. Ultimately, the episode highlights that …
Topics discussed
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Introduction to Dark Matter and the Cold Dark Matter Model
Defining Dark Matter and the CDM Fluid Model
Simulations and Candidate Particles (WIMPs, Axions)
The WIMP Miracle and Early Universe Annihilation
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The Missing Satellites Problem
Sub-halos and the Discrepancy in Satellite Counts
The Cusp-Core Problem and Density Profiles
Alternative Models: Warm Dark Matter
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Self-Interacting and Fuzzy Dark Matter Proposals
Re-evaluating CDM: The Role of Ordinary Matter
Why Small Sub-halos Are Invisible (Gas Retention)
Baryonic Feedback and Supernova Effects on Dark Matter
The Density Diversity Problem
The Too Big To Fail Problem
Challenges for Alternative Models and Current Status
Conclusion: The Importance of Ordinary Matter
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