CHC-BH-VP2 Surface-Commit Return Suppression: A Bounded Public Literature-Summary Support Audit of Black-Hole Candidates and Neutron-Star X-ray Transients

The CHC black-hole papers interpret horizons as accessibility boundaries rather than information-annihilating material surfaces. The present note converts that interpretation into a narrow audit lane. In the CHC reading, light is not a primitive substance that rebounds from a wall. It is the observable name for a commit-capable electromagnetic energy-information excitation on a phase-link structure, conditioned by local phase-field response. A neutron-star surface is an exterior material boundary with high electromagnetic commit readability. A black-hole horizon is not such a material boundary for the exterior domain.

The diagnostic expectation audited here is correspondingly narrow: quote Under matched compact-object comparison conditions, a black-hole candidate should not require an ordinary exterior material surface-return term to account for the literature-summary quiescent-emission and Type-I surface-burst diagnostics used in this audit. quote This is called the surface-commit return suppression lane. The observational motivation is continuous with the quiescent-luminosity and no-hard-surface event-horizon literature [citation].

This paper does not claim any of the following:

- a replacement for the event horizon or for classical general relativity; - a new compact-object theorem; - a full accretion-flow model; - a full population reanalysis of X-ray binaries; - a Hawking-radiation detection; - a horizon-material emission model; - a proof of the black-hole information problem; - CHC-wide empirical closure.

The only admitted output is a bounded public literature-summary audit of whether already-published quiescent-luminosity and burst-rate diagnostics are consistent with the CHC surface-commit-null reading.

Let $\Dext$TeX\Dext denote a fixed exterior observation domain. Let $\CEM$TeX\CEM be the exterior map that reads a local material phase-field response as an outgoing electromagnetic excitation capable of producing an exterior record. For an ordinary compact material surface $\partial M$TeX\partial M, the generic material response channel is not null:

\CEM \circ \Rmat_{\partial M} \neq 0 .

For a black-hole horizon $\Hplus$TeX\Hplus, the ordinary material surface-response channel is absent in the exterior domain:

\CEM \circ \Rmat_{\Hplus}=0
  \qquad \text{ordinary material surface-response lane only.}

Equation reference does not say that the black-hole system is electromagnetically dark in all respects. Disk, jet, wind, shock, corona, and exterior plasma responses remain in the exterior environment. Hawking radiation, if invoked, is a separate quantum-field boundary channel and not ordinary material re-emission from inside the horizon; it is retained only as a formal non-material channel in the schematic decomposition and is not numerically tested in this audit.

A schematic luminosity decomposition is

\Lobs
  =
  \Lext(M,a,\dot M,\mathrm{disk/jet/plasma})
  +\chisurf\,\Lsurf(\dot M,R_{\rm surf})
  +\Lqft+\epsilon .

The CHC surface-commit audit sets

\chisurf =
  
    1 \ \text{or nonzero},  \text{compact material-surface object},

    0,  \text{black-hole accessibility boundary in the ordinary material-surface lane}.

The observational expectation is not that $\Lext$TeX\Lext vanishes for black-hole systems. It is that observables requiring an ordinary hard surface, such as neutron-star-like quiescent surface luminosity or Type-I thermonuclear surface bursts, should be suppressed in black-hole candidates.

The support audit uses two literature-summary observables.

Quiescent luminosity surface-return gap

For quiescent X-ray novae, the surface-return gap can be summarized by an Eddington-scaled luminosity ratio or by a literature-reported luminosity contrast. In its simplest form, define

\Delta_{\SCR}^{\rm q}
  =
  \log_{10}\left[
  \frac{(\Lxq/\LEdd)_{\NS}}{(\Lxq/\LEdd)_{\BH}}
  \right] .

The literature-summary gate used in the support audit is

\Delta_{\SCR}^{\rm q} \ge 1 .

The threshold is intentionally weak: one decade of suppression. The public literature summary used here reports a roughly two-decade contrast, namely that quiescent black-hole X-ray novae are approximately one hundred times fainter than similar neutron-star X-ray novae [citation].

Type-I burst surface-channel gap

Type-I bursts are thermonuclear surface events associated with accretion onto neutron stars; their absence in black-hole candidates has been used as a no-hard-surface diagnostic in the event-horizon literature [citation]. The surface-channel audit uses the published burst-rate contrast between neutron-star transients and black-hole candidates. Let

\mathcal R_{\rm burst}
  =
  \frac{r_{\NS}}{r_{\BH}^{95\%\,\rm upper}} .

The support audit checks the overall rate contrast and the unstable-luminosity-region contrast using the public values reported by Tournear et al. [citation].

The audit is deliberately conservative.

- Use only declared literature-summary scalars included in the declared literature-summary table. - Do not fit accretion parameters, orbital-period scalings, disk models, or source-level luminosities. - Compute the quiescent luminosity contrast and Type-I burst-rate ratios. - Classify the outcome by declared reporting gates. - Report all limitations and do not promote the result to compact-object closure.

The primary gates are given in Table reference.

Figure or table content is omitted from the web reader; use the canonical manuscript for the exact object.

Applying the declared literature-summary reconstruction rule to the declared table surface gives Table reference.

Figure or table content is omitted from the web reader; use the canonical manuscript for the exact object.

The resulting bounded support-audit classification is center BH-VP2-PUBLIC-TABLE-RECONSTRUCTION-SURFACE-COMMIT-SUPPRESSION-CONDITIONAL-CHECK-SATISFIED. center The word conditional is essential. The table statuses are declared gate-level passes on public literature-summary scalars and public arXiv-source table reconstruction outputs, not standalone discoveries or object-level compact-object inferences. The audit states the cited public source tables and recomputes the declared suppression ratios, but it remains outside a new object-level X-ray-binary reanalysis. It supports the CHC accessibility-boundary reading only in the bounded surface-commit return lane.

The support audit remains subordinate to standard event-horizon reasoning. It provides a CHC retyping of standard no-hard-surface diagnostics on the declared public-table lane.

Quiescent luminosity: if accreting gas reaches a material surface, stored thermal energy can be radiated from the surface. If the central object has an event horizon, advected energy can disappear from the exterior X-ray surface-return channel. This is the standard motivation behind the quiescent luminosity contrast used here [citation].

Type-I bursts: if a compact object has a material surface where fuel accumulates, thermonuclear instabilities can produce Type-I bursts. Published burst-rate limits for black-hole candidates show strong suppression relative to neutron-star systems under the observing samples summarized in [citation].

Shadow imaging: EHT shadow diagnostics are not used as a numerical gate in this support audit. They are consistent with the same interpretation only at the qualitative level: transparent emission around a black hole can reveal a dark shadow caused by gravitational light bending and photon capture at the event horizon [citation]. This paper does not fit EHT images or introduce a surface-emission constraint; more detailed X-ray spectral approaches to event-horizon imprints are outside the present audit lane [citation].

The CHC-BH-VP2 lane would fail or be demoted if any of the following became necessary under matched conditions:

- black-hole candidates require neutron-star-like quiescent surface luminosity after exterior accretion effects are controlled; - black-hole candidates show Type-I surface thermonuclear bursts at neutron-star-like rates in the unstable luminosity region; - horizon-scale images require an independent ordinary material surface-emission term rather than exterior plasma emission plus photon capture/lensing; - the result is used to claim CHC-wide empirical closure or a new black-hole theorem.

This first BH-VP2 support audit is intentionally a bounded public-table reconstruction and literature-summary audit. It does not reconstruct raw object-level observations, orbital-period bins beyond the cited table surfaces, distances, absorption corrections, accretion histories, or source classifications beyond the public source tables. It does not model jets, winds, ADAF/RIAF parameters, magnetic fields, or disk instabilities. It therefore does not replace standard compact-object inference.

The bounded content is narrower: published no-hard-surface diagnostics are expressed here as a single CHC surface-commit return suppression lane. The lane is empirically suggestive only in the bounded sense reported by the support audit, and it does not remove the well-known caveats about observational proof of horizons [citation].

The companion source summaries contain the declared literature-summary dataset, public arXiv source-table reconstruction route, public source references, recomputation summaries for the reported metrics, diagnostic summaries, and public-source summaries. No private data, restricted-access inputs, unpublished observational products, or post-hoc fitted parameters are used.

CHC-BH-VP2 defines a bounded public audit of the surface-commit return channel in black-hole candidates. In the CHC language, a neutron star remains a compact material boundary capable of re-expressing local phase-field response as electromagnetic excitation, while a black-hole horizon is an accessibility boundary with no ordinary exterior material surface-return channel. Public literature-summary diagnostics and public arXiv-source table reconstruction of quiescent-luminosity suppression and Type-I burst upper-limit/non-detection contrast satisfy the declared gate-level checks on the support audit outputs. The result is a bounded public-table reconstruction conditional support comparison for the accessibility-boundary grammar, not an object-level X-ray-binary reanalysis, not a replacement for general relativity, not a full compact-object theorem, not a Hawking-radiation claim, and not CHC-wide empirical closure.