Is inflation falsifiable in practice?

Dru opened a New note discussion in Space on 24 September 2026: “In practice. Whether it is falsifiable in practice, not in principle.” A good answer identifies an observation that would rule inflation out in practice, rather than only exclude one model.

The question revisits his August view; Steinhardt's argument is a candidate for the next run. No sources gathered for this question yet.

Sub-questions

1. Which predictions are shared across the family of models?
2. What observations would exclude those predictions?
3. Can adjusting a model evade each proposed test?
4. Does eternal inflation make the theory unfalsifiable by construction?