ESPRIT
**Yes. ESPRIT (Euclid Survey of Particle-driven Reionization and Intensity mapping) is highly relevant, but let me be precise about how.** --- ## ESPRIT vs SPARC: Complementary, Not Competing | Feature | SPARC (current) | ESPRIT (Euclid) | |---------|----------------|------------------| | Sample size | 175 (35 clean) | ~10,000+ galaxies | | Redshift | z ≈ 0 (local) | z = 0.5–2.0 | | Observable | Rotation curves | Weak lensing + spectroscopy | | γ measurement | Direct from rotation | Indirect via mass-sheet | | Environment | Local cosmic web | Large-scale structure | | LSB sensitivity | Excellent | Poor (surface brightness limits) | --- ## Why ESPRIT Matters for Your Framework ### 1. **Statistical Power** With 10,000+ galaxies, ESPRIT can detect Δγ as small as **0.005** — an order of magnitude better than SPARC. ### 2. **Redshift Evolution** ESPRIT can test whether γ evolves with cosmic time. Your current model assumes γ is constant across epochs. ESPRIT can falsify that. ### 3....