Visual Timeline
Cosmic Timeline
From the parent universe through the bounce to SPHEREx 2028 and beyond.
The Story of the Universe
A previous universe contracts under gravity. Density increases toward Planck scale (~10⁹³ g/cm³).
Matter-dominated contraction. Perturbations grow, imprinting f_NL = -35/16 on the bispectrum. PBH seeds form.
Torsion (or quantum gravity) prevents singularity. Density reaches maximum but stays finite. Expansion begins.
Universe expands rapidly. No inflation needed — the contraction phase already solved the horizon and flatness problems.
Light elements form (H, He, Li). Identical to standard cosmology. ΔNeff ≈ 0 confirmed by our MCMC.
Universe becomes transparent. CMB carries bounce imprint: f_NL, birefringence β = 0.27°, spectral index.
Galaxies form from primordial perturbations. BigBounce's historical DESI pipeline records are unreconciled and do not establish a high-redshift population or a bounce connection; the anomaly flagship is being rebuilt.
Dark energy begins dominating expansion. Whether w(z) crosses -1 (quintom-B behavior) is treated theoretically in our program; external DESI DR2 (Adame et al.) reports 2.8–4.2σ for w-crossing depending on dataset combination. Our own DESI DR2 w0wa chain (Paper 1B) gives w_pivot = −0.952 ± 0.019, +2.5σ from −1.
BigBounce is organized around three research programs. The retained evidence library contains six exact candidate packages at 95% evidence readiness; the selected endpoint is six standalone works plus P3 as a supporting public-ID recovery release. The DESI anomaly flagship is being rebuilt, and final author review remains separate from endorsement, submission, and independent peer review.
SPHEREx is a relevant future probe of primordial non-Gaussianity. Whether the paper's conditional f_NL = −35/16 result maps to a survey-level test depends on the stated bounce-transmission and covariance assumptions; it would not by itself prove a unique bounce origin.
JAXA's LiteBIRD will measure birefringence to ~0.03°. Tests β = 0.27° prediction at ~9σ.
ESA's LISA will detect induced gravitational waves from PBH formation. Tests bounce GW spectrum directly.