Predictions→ Quintom w-Crossing
Quintom w-Crossing
The quintom bounce unifies the bounce with dark energy through phantom fields. It predicts the dark energy equation of state w(z) crosses −1 (quintom-B behavior). The DESI DR2 BAO + supernova combination from external groups now reports w-crossing at 2.8–4.2σ, but this is treated theoretically in our program — we have not run a free-w0–wa MCMC ourselves.
Theoretical (no in-house MCMC yet)
w(z) crosses w = −1
Quintom bounce
DESI DR2 (external, 2.8–4.2σ)
Current Constraint
Paper 1A's model-discrimination table is explicit: zero free-w0–wa samples among the 309,189 frozen posterior samples (Paper 1B). All quintom analysis in our papers is theoretical/discrimination-table only. External: DESI DR2 + Pantheon+ + DES SN5YR shows w-crossing at 2.8–4.2σ depending on the dataset combination.
Key Results
- Quintom bounce achieves bounce↔dark-energy unification that ECH cannot
- Discrimination table positions quintom vs matter bounce vs cuscuton vs ekpyrotic vs inflation
- External DESI DR2 (Adame et al.) shows 2.8–4.2σ w-crossing — independent of our program
- An earlier in-house claim of P(quintom-B) = 98.6% (50.9K samples) was traced to a bookkeeping error in an automated run and retracted — there are zero free-w0–wa samples in any of our chains