Theories of Everything with Curt Jaimungal Jenny Wagner: What If We've Been Wrong About Dark Matter For Decades?
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Mar 26, 2026 Jenny Wagner, an astrophysicist who specializes in gravitational lensing and inverse-problem methods, questions whether dark matter maps are mostly model-driven. She explains how lensing yields only local information. Short, punchy takes cover lensing degeneracies, model-independent reconstruction, challenges to common halo assumptions, and implications for cosmology’s foundational principles.
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Dare Not To Know Separate Data From Models
- Dare not to know: separate raw observables from model assumptions and avoid filling gaps with unjustified priors.
- Wagner urges sticking to data-given local information and labeling any global mass inference as model-driven extrapolation.
Equations Force Locality In Lensing Inference
- The lensing formalism's equations depend on position x, forcing any model-independent constraints to be local.
- Wagner used functional-analysis translations to show every lensing observable is intrinsically x-dependent, removing global certainty.
Inverse Modeling Reveals Necessary Causes
- Forward modeling predicts from assumed causes and is easy but fragile; inverse modeling finds necessary assumptions implied by data.
- Wagner compares inverse solving to CSI: identify necessary steps (mug fell) before hunting culprits.