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Paper 2
The Exact Matter-Contraction Non-Gaussian Amplitude: Four-Vertex Derivation and Conditional Large-Scale-Structure Mapping
The bounce program's core prediction: an exact primordial non-Gaussianity amplitude (f_NL = −35/16)
Derives f_NL = −35/16 for the stated matter-contraction background and cubic action, then maps that result conditionally to published and in-house large-scale-structure sensitivity estimates. v1.7.130 adds the APS AI-use disclosure and a drift-proof deposit reference; its final-hash bounded confirmation and Houston review remain separate from the earlier evidence.
0B/0M/0m/0C open · July 24, 2026
A four-vertex derivation of the matter-contraction non-Gaussian amplitude under the manuscript's stated assumptions, followed by conditional large-scale-structure mappings. Published SPHEREx sensitivities and an in-house Fisher calculation are used as bounded forecasting diagnostics; they are not treated as mechanism-independent predictions or detections.
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- Four-vertex fNL = -35/16 derivation under stated assumptions
- Committed symbolic and Fisher cross-checks
- Conditional SPHEREx and large-scale-structure sensitivity mapping
- Bounded final-hash confirmation and Houston PRD sign-off
- First template-mismatch quantification between matter-bounce and local fNL templates: local estimator recovers 84\% ± 2\% of bounce signal
- Bispectrum-only SPHEREx forecast σ(fNL^local) ≈ 0.7 gives template-corrected 3–5σ after full systematic budget
- Bayesian model comparison: BF~ 10–17 favoring bounce over tuned multifield competitors at the broad-prior envelope
- Bounce-vs-inflation contrast: |fNL^bounce|/|fNL^inf| ≈ 290 in absolute value
External peer review kit
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preview prompt
You are an external referee for MNRAS / Physical Review D / JCAP (target journal depends on paper). Attached: Paper 2 v1.7.130 — "The Exact Matter-Contraction Non-Gaussian Amplitude: Four-Vertex Derivation and Conditional Large-Scale-Structure Mapping" Source: research/focused_paper_source_integration/02_full_draft.tex PDF: PDF · 12 pp · v1.7.130 · updated Jul 24, 2026 · md5 f7116fe3e2541d6f649876f2ec7789ee — v1.7.130 closes two PRD submission gates in one directive-G bundle: the APS-required AI-usage disclosure, which P2 carried none of, written full rather than minimised and naming only the models actually on this paper's record; and a drift-proof deposit reference that can no longer go stale against the deposited bytes. No readiness change. Read the FULL PDF end-to-end. Produce a referee report in MNRAS format with: 1. Recommendation: ACCEPT / MINOR REVISIONS / MAJOR REVISIONS / REJECT 2. BLOCKERS (must fix before publication) — list each with section/line + proposed fix 3. MAJORS (should fix) — same format 4. MINORS (polish) — same format 5. Strengths (>= 3 bullet points) 6. Specific scrutiny on: - Four-vertex f_NL = -35/16 derivation under stated assumptions - Committed symbolic and Fisher cross-checks - Conditional SPHEREx and large-scale-structure sensitivity mapping - Bounded final-hash confirmation and Houston PRD sign-off CALIBRATION (do not burn findings on these known classes): - The current date is June 2026. arXiv identifiers of the form 25xx.xxxxx and 26xx.xxxxx are VALID, already-published preprints — do not flag them as "future-dated" or "nonexistent". Verify a citation against arXiv/ADS before claiming it does not exist. - Correction notes, retraction notices, and "an earlier version stated X" disclosures in the text are DELIBERATE transparency policy. Flag them only if their content is wrong, never for existing. - Companion-paper citations marked "posted concurrently on arXiv" are deliberate placeholders; real arXiv IDs are inserted during the coordinated submission sequence. - Explicitly labeled conservatism allowances, scaling estimates, ansatz/heuristic status labels, and disclosed queued follow-up computations are deliberate scoping, not oversights — flag only if the label itself is inaccurate. - PDF text extraction can mangle math (square roots, fractions, superscripts). Before flagging "garbled" or "wrong" math, consider extraction artifacts; flag only what is visibly wrong in the rendered PDF. VERDICT STANDARD (apply the SAME high bar a first-pass Physical Review D / MNRAS referee would — this is one of the most rigorous journals in the world): - Assign each finding's severity (BLOCKER / MAJOR / MINOR) by your own independent referee judgment. Do NOT default to any tier, and do NOT soften a finding because the rest of the paper is strong. Do not echo this prompt's context. - A reporting choice that headlines the more favorable of two numbers, an unstated assumption, an uncontrolled systematic, or an internal inconsistency IS a real finding — classify it honestly (MINOR at minimum), not as mere "style" or "opinion". - Truth-audit any claim that seems off by checking it against the published .tex / on-disk artifacts before flagging (this only filters out genuine extraction artifacts — it does not lower the bar on real defects).
- 01fNL = -35/16 = -2.1875 under the stated background, gauge, and cubic-action assumptions
- 02Four-vertex squeezed-limit derivation and committed symbolic cross-check agree
- 03Eq. 3 1/k² shape function fix (Wave 11) restores claim-derivation consistency
- 04Normalization audit: 92% confidence via vertex-by-vertex Cai action
- 05SPHEREx Fisher forecast: σ(fNL) ≈ 0.36 (Fisher) / 0.93 (Munchmeyer+2019 conservative) → ~1.3-2.75σ realistic detection
- 06Heinrich+2023σ(fNL) ≈ 0.5–0.7 SPHEREx anchor (R35 polish)
- 07INDEPENDENT bispectrum Fisher (c13, v1.7.100): from-scratch tree-level multi-tracer Fisher on the same public SPHEREx table reproduces Heinrich σ(fNL^local)=0.63–0.69 (within 2–11%), recovers σ(fNL^bounce)=0.63–0.69 → r_eff≈0.99 and an unmarginalized ~3.2–3.5σ for −35/16 — validates the recast, retires the 'no independent Fisher' concession (GR-projection bracket 0.8–1.3σ still applies on top)
- 08REDSHIFT-SPACE (RSD) tree bispectrum Fisher (c14, v1.7.103): extends c13 with the Kaiser Z1=b+fμ² factor + SCF99/Sefusatti Z2 kernel, growth f(z)=fσ8/σ8 from the same CAMB Planck2018, orientation-integrated over full (μ1,φ) so ℓ=0,2,4 content is exact. σ(fNL^local) tightens to 0.415 (b-fix)/0.449 (b-marg) vs real-space 0.688 (+34.7% tighter; bounce-template bias-marginalized baseline; RSD/Heinrich 0.64); σ(fNL^bounce)=0.417/0.449; r_eff≈0.99 persists in redshift space; f→0 reproduces c13 to 6 sig-figs. Unmarginalized −35/16 significance rises to 4.9–5.2σ (before the systematic + GR-projection budget) — retires the 'real-space monopole only, ~18% offset' limitation with real computation
- 09Template mismatch quantification between bounce and local shapes
- 10Joint (fNL, n_fNL) SDB Fisher rebuilt from committed code: subordinate channel at 1.4σ (fixed-bias) / 0.6σ (bias-marginalized); earlier ~9.9σ joint-Fisher claim withdrawn (not reproducible from documented inputs)
- 11Table III rebuilt from committed c9g recompute: BF/lnBF per config 3.5e8/7.0, 4.5e5/6.1, 6.4e2/4.7 (envelope ~9–14 under bounce-amplitude bookkeeping); Φ/ζ convention mapping proven exactly; 0.5000 ratio identified as the −2Im operator identity
- 12QSFI scaling endpoints corrected per Chen–Wang; −35/16 single-field result re-attributed to Li–Quintin–Wang–Cai at 17 sites
- 13Continuous-GR-recovery marginalization (c9k): bounce preference robust at BF = 6.0; GR-degradation calibration corrected ~15% → ~23% (c9k-verified)
- 14σ_theory continuous marginalization (c9l): configuration ranking stable under continuous theory-error treatment (R25conf wave)
- 15G3 model-specific torsion bound (v1.7.125, Eq. 5): |δfNL^tor| ≲ (35/16)(3/16)[γ²/(1+γ²)] κ n_ψ,c²/ρ_c via a sympy Einstein-Cartan four-fermion estimate anchored to the companion P1A's convention-audited contact term (benchmark reproduced to 0.1%); within EFT validity (x_ψ<1) the bound saturates at prefactor 0.022 (γ=0.2375) to 0.21 (γ=1) — torsion never exceeds ~1-10% of the -35/16 amplitude, <<1e-3 for sub-Planckian n_ψ,c — converting assumption (f) from asserted to bounded