Observable detail · STRONG-FIELD
Neutron star M_max (J0740+6620)
PSR J0740+6620 — DCT inherits GR + nuclear EOS.
| Prediction | \(M_{\rm max} \ge 2.08 M_\odot\) for nucleonic EOS |
|---|---|
| Measured | \(M = 2.08 \pm 0.07 M_\odot\) (NICER + Shapiro delay) |
| Residual | 1.00σ |
| Status | PASS |
| Source paper | DCT-SBD-01 |
Mechanism
DCT inherits GR strong-field; neutron-star mass-radius and \(M_{\rm max}\) follow from the TOV equation with the standard nuclear equation of state. Tidal Love numbers and post-Keplerian parameters in binary pulsars are unchanged from the GR prediction.
Derivation
TOV equation with standard nuclear EOS gives \(M_{\rm max} \sim 2.1 M_\odot\); DCT inherits this through the no-scalar-hair theorem (DCT-SBD-01). The PSR J0740+6620 Shapiro-delay mass \(2.08 \pm 0.07 M_\odot\) is consistent at \(1.00\sigma\).
Python verification
The verification script for this observable is astrophysical_tests.py. Run it with python3 astrophysical_tests.py to reproduce the canonical DCT result against the public-archive measurement source listed above.
Methodology
| Domain | Solar-system / strong-gravity (GR) |
|---|---|
| Input data source | See "References" below for the canonical public-archive citation. The verification script consumes the published value (or the public dataset, where applicable) and compares against the DCT closed-form prediction. |
| Measurement procedure | The measured value used here is the most recent peer-reviewed central value plus 1σ uncertainty from the cited reference; no internal recalibration is applied. |
| Acceptance threshold | HIT: residual within 1σ of measurement. SOFT: directional agreement, residual within bracketing range. OPEN: untested or unresolved. |
| Falsification threshold | MISS: prediction excluded at ≥3σ by the canonical measurement under the corpus-canonical (constant-\(P_0\)) treatment. |
| Current status | See the verdict pill in the prediction table above. |
Cross-references
Related observables in the same domain: ns-radii-nicer · gw170817-tidal.
Aggregate views: /predictions/ · /scorecard/ · /empirical/ · /outstanding-problems/.
Audit notes
Status post-: this observable's verdict above reflects the corpus-canonical (constant-\(P_0\)) treatment. Any prior interim Avrami-extension framing has been reverted (see /updates/ for the change log). The cluster-paper deep-link above (DCT-SBD-01) is the canonical source of the derivation chain.
References
- PSR J0740+6620 NICER
- Source paper: DCT-SBD-01
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