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Entanglement Capacity from SGOC Slack Purity Slack, Rényi-2 Entropy, and the Modal Capacity Spectrum

Nala Trees

Published Apr 21, 2026• 0 citations
Publisher

Abstract

This paper is part of the SGOC programme and it identifies the canonical capacity scalar Sc with a standard quantum-information entropy on a declared entanglement branch. For a normalised pure-state bipartition A|B, when the multiplicative slack is taken to be the reduced-state purity, epsilon_A = Tr(rho_A^2), the capacity scalar is exactly the order-2 Rényi entropy, Sc,A|B = -log epsilon_A = S2(rho_A). This is not a new scalar definition. It is a branchwise identification of the already canonical SGOC scalar with the Rényi-2 entanglement entropy of the reduced state. The note checks the standard structural tests expected of such an identification: product pure states give zero capacity entropy; local unitary changes leave the scalar invariant; tensor products add because purities multiply; and the logarithmic form is canonical once a multiplicative purity slack is required to become an additive scalar coordinate. The paper also keeps the scalar/spectrum distinction explicit. The full von Neumann entropy is recovered from the modal capacities over the Schmidt spectrum, S_vN(rho_A) = sum_i lambda_i(-log lambda_i), not from a single scalar moment alone. Thus Sc records the Rényi-2 purity channel exactly, while the complete modal list is needed for full entropic bookkeeping. Within SGOC, the result gives the capacity scalar a clean entanglement reading. It strengthens the interpretation of Sc as a common scalar interface between capacity geometry, quantum structure, entropy language, and the gravity-facing lane, including the selected tensorial gravity packet to which this note is attached. The claim boundary is deliberately narrow. The paper does not claim that one scalar reconstructs arbitrary Schmidt spectra, does not derive unrestricted quantum gravity from entanglement, and does not replace established quantum-information entropy theory. It proves an exact identification on the declared purity-slack branch and records how that identification fits the existing SGOC scalar architecture. Related SGOC papers Primal Quantum Gravity: Beyond-first-order predictive laws, the Jacobson--Schrodinger bridge via capacity geometry, and common-source zeta structure. DOI: 10.5281/zenodo.19592981 Prime-Partition Criticality on a Scalar/Conformal Gravity Lane. Optical-delay thresholds and gauge-weight consequences of logarithmic primon-gas criticality 10.5281/zenodo.19593222 Branch Structure, Restricted Arithmetic Profiles, and Phase-Sensitive Exits in the Jacobson--Schrodinger Bridge 10.5281/zenodo.19601147 Primal Gravity: From Prime-Zeta Sc to Tensorial Plebanski-Einstein Geometry 10.5281/zenodo.19647370 Capacity Geometry: REG, Dirichlet Tension, Curvature Identity, and Quasi-Local Mass. The Spectral Geometry of Coherence, Volume Two, Part 1, v2.0. DOI: 10.5281/zenodo.19156067 The Canonical Capacity Coordinate and the Unique Quadratic Tension in the Capacity Gauge. The Spectral Geometry of Coherence, Volume Two, Part 1A, v2.0. DOI: 10.5281/zenodo.19156316 Mass as Spectral Data in Capacity Geometry: Bulk Corridors and Bubble Caps. The Spectral Geometry of Coherence, Volume Two, Part 2, v2.0. DOI: 10.5281/zenodo.19161229 An Operational Verification Suite for a Capacity-Field Gravity Readout: Dual-Engine Poisson-Bridge Gates, Relativity Coherence Checks, and REG Micro-Audits. The Spectral Geometry of Coherence, Volume Two, Part 3, v2.0. DOI: 10.5281/zenodo.19161141 Arithmetic Source to Recovered Capacity Scalar. Carrier-mediated prime-built routes, restricted scalar closure, and exact stopping criterion. The Spectral Geometry of Coherence, Volume Three, Part 5. DOI: 10.5281/zenodo.19580874 Arithmetic Source Scalars, Recovered Capacity Geometry, and the Restricted Gravity Sector. The Spectral Geometry of Coherence, Volume Three, Part 6. DOI: 10.5281/zenodo.19593161 Gauge-Covariant Coherence Coupling of the Capacity Scalar to Yang--Mills in Four Dimensions: No-go results, conformal triviality, and the first viable effective coupling. DOI: 10.5281/zenodo.19593005 Programme summary files - birds eye view on what the papers prove: SGOC Programme Compendium - Technical 10.5281/zenodo.19614677 SGOC Programme Compendium - Pedagogical 10.5281/zenodo.19614652

DOI
10.5281/zenodo.19673516

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The Spectral Geometry of Coherence (SGOC) Programme Compendium - Simplified Summary v1 21-04-26

Nala Trees

The Spectral Geometry of Coherence (SGOC) is a research programme asking whether one forced geometric scalar can act as a common interface between quantum mechanics, gravity, and arithmetic structure. The central object is a scalar field called Sc, Sc = −log(1 − R²), where R measures the normalized coherence between two coupled channels. Sc is not chosen arbitrarily. It is the coordinate forced by the programme’s own transport law: multiplicative slack becomes additive capacity. From this scalar, together with the declared fixed-background action class, SGOC derives the nonrelativistic Schrödinger equation as a forced geometric consequence rather than taking it as a starting postulate. The same scalar also controls capacity-metric curvature and satisfies an exact identity linking three objects normally discussed in separate settings: the quantum potential, scalar curvature, and an Unruh-type temperature. This is the Jacobson-Schrodinger compatibility law. The most recent arithmetic results show that, on a selected mathematical branch, the same scalar is also a zeta scalar: Sc = log ζ(σ). In that branch, Sc is a lossless register of prime-power source data. A conditional theorem then connects prime source data, through canonical Sc, to a selected tensorial Plebanski-Einstein gravity branch. The theorem is not a claim that primes vaguely “look like” gravity; it is a conditional chain with stated hypotheses and failure modes. The Wallstrom problem, a long-standing obstacle for geometric derivations of quantum mechanics, is addressed directly. Multiple branches are resolved under stated hypotheses, while the remaining open problems are named rather than hidden. The programme is large and modular, explicit about boundaries, and covers many papers and more results of substance than the selected highlights above shows. Some results are clean theorems. Others are conditional on named assumptions. Some are numerical audits with stated controls. Several attractive routes are ruled out by negative results, including a density-collapse result showing that smoothed scalar density alone cannot carry the full arithmetic content. All results are provisional pending independent expert review. This document is a pedagogical companion to the fully technical version: SGOC Programme Compendium – Technical, 10.5281/zenodo.19614677

•Apr 16, 2026•0 citations

Landauer, Relative Entropy, and Fisher Length in Capacity Geometry

Nala Trees

Landauer, Relative Entropy, and Fisher Length in Capacity Geometry. This paper is a standalone companion note adjacent to the broader SGOC programme. It gives a thermodynamic translation of the capacity-geometry slow scalar Sc=−log⁡(1−R2)S_c = -\log(1 - R^2)Sc=−log(1−R2), working in a lane that is deliberately narrower than the programme’s quantum, inverse-probe, or many-body notes. Its central theorem-lane points are: the thermodynamically meaningful object is the normalized surprisal Sp=−log⁡p,p=e−Sc/Z[Sc]S_p = -\log p,\quad p = e^{-S_c}/Z[S_c]Sp=−logp,p=e−Sc/Z[Sc], not bare ScS_cSc, and this normalized lift is gauge invariant under additive shifts of ScS_cSc; Shannon entropy and relative entropy become endpoint ledgers of mean normalized capacity; the exact state-space Fisher audit is the weighted companion Ix[p]=Z[Sc]−1F0[Sc;Ω]I_x[p] = Z[S_c]^{-1}\mathcal{F}_0[S_c;\Omega]Ix[p]=Z[Sc]−1F0[Sc;Ω], so the precise probability-lane Fisher object is weighted and should not be conflated with the unweighted geometric audits REG0\mathrm{REG}_0REG0 or REG\mathrm{REG}REG; the control-space Fisher metric Iij(λ)=Cov⁡pλ(∂iSc,∂jSc)\mathcal{I}_{ij}(\lambda) = \operatorname{Cov}_{p_\lambda}(\partial_i S_c,\partial_j S_c)Iij(λ)=Covpλ(∂iSc,∂jSc) induces the natural protocol Fisher length and protocol action along a control path; no universal static single-state identity collapses entropy or Landauer cost into REG0\mathrm{REG}_0REG0 or F0\mathcal{F}_0F0. The paper is explicit about scope. It does not claim a new derivation of Landauer’s principle from the SGOC ledger alone, a completed read/write asymmetry theorem, a bulk-boundary theorem, or a many-body completion. Its claim is narrower and sharper: the thermodynamic lane of the capacity scalar can be written exactly in normalized capacity variables, with a clean separation between endpoint entropy, state-space Fisher localization, and protocol-space Fisher geometry. KeywordsLandauer principle; relative entropy; Fisher information; thermodynamic length; capacity geometry; normalized surprisal; protocol Fisher metric; entropy dissipation; gauge invariance; control-space geometry DOI10.5281/zenodo.19186309 Related SGOC programme records for interested readers:The Canonical Capacity Coordinate and the Unique Quadratic Tension in the Capacity Gauge, The Spectral Geometry of Coherence (SGOC), Volume Two, Part 1A, v2.0. DOI: 10.5281/zenodo.19156316 Localisation Rather than Saturation in Capacity Geometry: REG Dissipation, Forced Balance Laws, and a Restricted Ricci Bridge, The Spectral Geometry of Coherence (SGOC), Volume Two, Part 6A, v2.0. DOI: 10.5281/zenodo.19174434

•Mar 23, 2026•0 citations

The Schrödinger Equation from Capacity Geometry: General forced-action theorem on a fixed capacity background

Nala Trees

This record contains Version 2.0 of The Schrödinger Equation from Capacity Geometry: General Forced-Action Theorem on a Fixed Capacity Background. Version 2.0 supersedes the earlier narrower local formulation (DOI: 10.5281/zenodo.19118007). The earlier record worked within a restricted quadratic-gradient density class. The present record proves the same result on the full local first-order homogeneous density class, with the weighted bulk-plus-flux bridge as the load-bearing structural principle rather than a minimality assumption on derivative order. The theorem lane is therefore broader, the claim boundaries are cleaner, and the companion-note dependence has been updated to reflect the current SGOC corpus. This record DOI. 10.5281/zenodo.19189901 should be treated as the source-of-record citation for the general fixed-background Schrödinger result. The paper proves a narrow but exact claim: within the full first-order homogeneous density class compatible with continuity-current structure, the Fisher-corrected Madelung action is the unique admissible action family up to the stated constant, and its Euler–Lagrange equations are exactly the Schrödinger equation. The decisive density correction is forced inside an upstream capacity-geometric theorem base rather than inserted by a diffusion or stochastic postulate. The logical scaffold is explicit and limited. Part 1A fixes the canonical logarithmic capacity scalar and the unique quadratic base tension. Parts 6 and 7A isolate the phase-blindness ceiling for the continuous quadratic sector. Part 6A sharpens the localisation-versus-smoothing and forced-balance framework. The present paper then shows that continuity-current compatibility fixes the phase sector, locality and first-order dependence force the full homogeneous density family, and a universal weighted bulk-plus-flux bridge with field-independent coefficients forces the Fisher form. The canonical member of that family is fixed by the bridge to the imported capacity scalar. In that precise sense the logical order at the Schrödinger layer is reversed: the geometric base comes first, and the Schrödinger action appears downstream of it. The claim is exact within its lane and no broader. This is a fixed-background, single-particle theorem stated away from nodal sets. It does not claim a many-body theory, a measurement theory, a relativistic completion, a full nodal-complement reconstruction theorem, or backreaction of the quantum sector on the background geometry. Appendix D records that on a nodal-complement component, once the phase-sensitive completion is an S¹-valued phase field, circulation quantisation and wavefunction reconstruction are automatic. Appendix G records a conditional H¹-closure lane inside the same fixed-background action. The discrete-curvature and branch-bookkeeping support used on nodal-complement triangulations belongs to the companion Closure Phase note, while the further complement-globalisation step belongs to the companion Relative Cohomology note. Keywords: Schrödinger equation; capacity geometry; Fisher information; Madelung action; phase-sensitive evolution; forced action; homogeneous density class; weighted Fisher bridge; REG; coherence scalar; fixed background; nodal complement; reproducibility Companion manuscripts cited in this paper's proof chain, from the SGOC programme: Part 1A: The Canonical Capacity Coordinate and the Unique Quadratic Tension in the Capacity Gauge. DOI: 10.5281/zenodo.19156316 Part 7A: The Second-Order Ceiling, Triadic Completion, and the Wilson-Triangle Lift. DOI: 10.5281/zenodo.19175902 Closure Phase as Discrete Curvature on a Triangulated 2-Complex. DOI: 10.5281/zenodo.19185885 Relative Cohomology and Cut-Graph Holonomy Trivialisation. DOI: 10.5281/zenodo.19185877 Additional provenance notes cited in the paper Part 6A: Localisation Rather than Saturation in Capacity Geometry: REG Dissipation, Forced Balance Laws, and a Restricted Ricci Bridge. DOI: 10.5281/zenodo.19174434 Landauer, Relative Entropy, and Fisher Length in Capacity Geometry. DOI: 10.5281/zenodo.19186309

•Mar 23, 2026•0 citations
This paper is part of the SGOC programme and it identifies the canonical capacity scalar Sc with a standard quantum-information entropy on a declared entanglement branch. For a normalised pure-state bipartition A|B, when the multiplicative slack is taken to be the reduced-state purity, epsilon_A = Tr(rho_A^2), the capacity scalar is exactly the order-2 Rényi entropy, Sc,A|B = -log epsilon_A = S2(rho_A). This is not a new scalar definition. It is a branchwise identification of the already canonical SGOC scalar with the Rényi-2 entanglement entropy of the reduced state. The note checks the standard structural tests expected of such an identification: product pure states give zero capacity entropy; local unitary changes leave the scalar invariant; tensor products add because purities multiply; and the logarithmic form is canonical once a multiplicative purity slack is required to become an additive scalar coordinate. The paper also keeps the scalar/spectrum distinction explicit. The full von Neumann entropy is recovered from the modal capacities over the Schmidt spectrum, S_vN(rho_A) = sum_i lambda_i(-log lambda_i), not from a single scalar moment alone. Thus Sc records the Rényi-2 purity channel exactly, while the complete modal list is needed for full entropic bookkeeping. Within SGOC, the result gives the capacity scalar a clean entanglement reading. It strengthens the interpretation of Sc as a common scalar interface between capacity geometry, quantum structure, entropy language, and the gravity-facing lane, including the selected tensorial gravity packet to which this note is attached. The claim boundary is deliberately narrow. The paper does not claim that one scalar reconstructs arbitrary Schmidt spectra, does not derive unrestricted quantum gravity from entanglement, and does not replace established quantum-information entropy theory. It proves an exact identification on the declared purity-slack branch and records how that identification fits the existing SGOC scalar architecture. Related SGOC papers Primal Quantum Gravity: Beyond-first-order predictive laws, the Jacobson--Schrodinger bridge via capacity geometry, and common-source zeta structure. DOI: 10.5281/zenodo.19592981 Prime-Partition Criticality on a Scalar/Conformal Gravity Lane. Optical-delay thresholds and gauge-weight consequences of logarithmic primon-gas criticality 10.5281/zenodo.19593222 Branch Structure, Restricted Arithmetic Profiles, and Phase-Sensitive Exits in the Jacobson--Schrodinger Bridge 10.5281/zenodo.19601147 Primal Gravity: From Prime-Zeta Sc to Tensorial Plebanski-Einstein Geometry 10.5281/zenodo.19647370 Capacity Geometry: REG, Dirichlet Tension, Curvature Identity, and Quasi-Local Mass. The Spectral Geometry of Coherence, Volume Two, Part 1, v2.0. DOI: 10.5281/zenodo.19156067 The Canonical Capacity Coordinate and the Unique Quadratic Tension in the Capacity Gauge. The Spectral Geometry of Coherence, Volume Two, Part 1A, v2.0. DOI: 10.5281/zenodo.19156316 Mass as Spectral Data in Capacity Geometry: Bulk Corridors and Bubble Caps. The Spectral Geometry of Coherence, Volume Two, Part 2, v2.0. DOI: 10.5281/zenodo.19161229 An Operational Verification Suite for a Capacity-Field Gravity Readout: Dual-Engine Poisson-Bridge Gates, Relativity Coherence Checks, and REG Micro-Audits. The Spectral Geometry of Coherence, Volume Two, Part 3, v2.0. DOI: 10.5281/zenodo.19161141 Arithmetic Source to Recovered Capacity Scalar. Carrier-mediated prime-built routes, restricted scalar closure, and exact stopping criterion. The Spectral Geometry of Coherence, Volume Three, Part 5. DOI: 10.5281/zenodo.19580874 Arithmetic Source Scalars, Recovered Capacity Geometry, and the Restricted Gravity Sector. The Spectral Geometry of Coherence, Volume Three, Part 6. DOI: 10.5281/zenodo.19593161 Gauge-Covariant Coherence Coupling of the Capacity Scalar to Yang--Mills in Four Dimensions: No-go results, conformal triviality, and the first viable effective coupling. DOI: 10.5281/zenodo.19593005 Programme summary files - birds eye view on what the papers prove: SGOC Programme Compendium - Technical 10.5281/zenodo.19614677 SGOC Programme Compendium - Pedagogical 10.5281/zenodo.19614652
This is Paper 143 in the Anaxiomatic Mechanics / pq-Spacetime stack. It develops the mechanics of entanglement in pq-spacetime from the finite closure structure established in Paper 142. For a bipartite system, the outcome-resolved future histories form a joint amplitude ledger whose normalized Gram spectrum defines the cross-boundary closure spectrum. This spectrum provides a basis-independent foundation for Schmidt rank, entanglement entropy, purity, and the effective number of participating closure sectors. Entanglement entropy is therefore not a raw count of microscopic histories or boundary crossings. The histories must first interfere through their Z4 phases, after which the surviving orthogonal closure sectors determine the observable entropy. The singlet boundary consequently carries two equal closure weights and entropy ln 2. The paper also derives a finite boundary-capacity bound, distinguishes decoherence from disentanglement, and explains long-distance persistence as invariance under local norm-preserving evolution rather than as a force acting across space. Decoherence occurs when environmental boundary enlargement creates distinguishable records and suppresses accessible phase relations. Finally, geometry and entanglement are identified as distinct invariants of the same finite β-boundary structure: geometry is read from transfer-kernel moments, while entanglement is read from the closure spectrum. No adjustable collapse rate, distance-decay law, area coefficient, or finite correction to standard quantum correlations is introduced.
We study the entanglement R\'enyi $\ensuremath{\alpha}$ entropy $(\mathrm{ER}\ensuremath{\alpha}\mathrm{E})$ as the measure of entanglement. Instead of a single quantity in standard entanglement quantification for a quantum state by using the von Neumann entropy for the well-accepted entanglement of formation (EoF), the $\mathrm{ER}\ensuremath{\alpha}\mathrm{E}$ gives a continuous spectrum parametrized by variable $\ensuremath{\alpha}$ as the entanglement measure, and it reduces to the standard EoF in the special case $\ensuremath{\alpha}\ensuremath{\rightarrow}1$. The $\mathrm{ER}\ensuremath{\alpha}\mathrm{E}$ provides more information in entanglement quantification and can be used, for example, to determine the convertibility of entangled states by local operations and classical communication. A series of results is obtained: (i) we show that the $\mathrm{ER}\ensuremath{\alpha}\mathrm{E}$ of two states, which can be mixed or pure, may be incomparable, in contrast to the fact that there always exists an order for the EoF of two states; (ii) similar to the case of EoF, we study in a fully analytical way the $\mathrm{ER}\ensuremath{\alpha}\mathrm{E}$ for arbitrary two-qubit states, the Werner states, and isotropic states in the general ddd dimension; and (iii) we provide a proof of the previous conjecture for the analytical functional form of the EoF of isotropic states in the arbitrary ddd dimension.
The direct static capacity region of a bipartite quantum state describes its asymptotic conversion into classical communication, quantum communication, and entanglement, with all communication directed from Alice to Bob. This paper gives a unified entropic converse for this region. The proof treats generated and consumed resources simultaneously and derives all three information inequalities for one local instrument. Its main ingredients are no-signalling, the chain rule, strong subadditivity, and continuity of conditional entropy. A supporting-hyperplane characterization leads to the static capacity formula, which is helpful in determining single-letterization of the capacity region. For a pure state of entanglement entropy hhh subjected to erasure with probability ppp, the complete region is the convex hull of 000 and (0,−ph,(1−p)h)(0,-ph,(1-p)h)(0,−ph,(1−p)h), plus the unit-resource cone. This statement holds for arbitrary collective instruments by using subset-entropy inequalities related to earlier methods used for the dynamic capacity region of the erasure channel. Complete characterizations also hold for symmetrically extendible states and locally flagged pure-state mixtures. For maximally correlated states, the optimization over local instruments admits an exact matrix formulation and an additive outer bound. An explicit qubit example shows that a nonorthogonal discarded quantum memory can outperform every efficient instrument and every instrument with conditionally commuting discarded states. For states obtained by qubit dephasing of Schmidt-aligned pure states, an exact threshold characterizes when the static capacity formula vanishes, at every blocklength and after regularization. Full single-letter characterizations for general Hadamard states and for the remaining trade-offs for dephased states remain open, with sufficient additivity conditions identified.
The Spectral Geometry of Coherence (SGOC) is a research programme asking whether one forced geometric scalar can act as a common interface between quantum mechanics, gravity, and arithmetic structure. The central object is a scalar field called Sc, Sc = −log(1 − R²), where R measures the normalized coherence between two coupled channels. Sc is not chosen arbitrarily. It is the coordinate forced by the programme’s own transport law: multiplicative slack becomes additive capacity. From this scalar, together with the declared fixed-background action class, SGOC derives the nonrelativistic Schrödinger equation as a forced geometric consequence rather than taking it as a starting postulate. The same scalar also controls capacity-metric curvature and satisfies an exact identity linking three objects normally discussed in separate settings: the quantum potential, scalar curvature, and an Unruh-type temperature. This is the Jacobson-Schrodinger compatibility law. The most recent arithmetic results show that, on a selected mathematical branch, the same scalar is also a zeta scalar: Sc = log ζ(σ). In that branch, Sc is a lossless register of prime-power source data. A conditional theorem then connects prime source data, through canonical Sc, to a selected tensorial Plebanski-Einstein gravity branch. The theorem is not a claim that primes vaguely “look like” gravity; it is a conditional chain with stated hypotheses and failure modes. The Wallstrom problem, a long-standing obstacle for geometric derivations of quantum mechanics, is addressed directly. Multiple branches are resolved under stated hypotheses, while the remaining open problems are named rather than hidden. The programme is large and modular, explicit about boundaries, and covers many papers and more results of substance than the selected highlights above shows. Some results are clean theorems. Others are conditional on named assumptions. Some are numerical audits with stated controls. Several attractive routes are ruled out by negative results, including a density-collapse result showing that smoothed scalar density alone cannot carry the full arithmetic content. All results are provisional pending independent expert review. This document is a pedagogical companion to the fully technical version: SGOC Programme Compendium – Technical, 10.5281/zenodo.19614677
Landauer, Relative Entropy, and Fisher Length in Capacity Geometry. This paper is a standalone companion note adjacent to the broader SGOC programme. It gives a thermodynamic translation of the capacity-geometry slow scalar Sc=−log⁡(1−R2)S_c = -\log(1 - R^2)Sc=−log(1−R2), working in a lane that is deliberately narrower than the programme’s quantum, inverse-probe, or many-body notes. Its central theorem-lane points are: the thermodynamically meaningful object is the normalized surprisal Sp=−log⁡p,p=e−Sc/Z[Sc]S_p = -\log p,\quad p = e^{-S_c}/Z[S_c]Sp=−logp,p=e−Sc/Z[Sc], not bare ScS_cSc, and this normalized lift is gauge invariant under additive shifts of ScS_cSc; Shannon entropy and relative entropy become endpoint ledgers of mean normalized capacity; the exact state-space Fisher audit is the weighted companion Ix[p]=Z[Sc]−1F0[Sc;Ω]I_x[p] = Z[S_c]^{-1}\mathcal{F}_0[S_c;\Omega]Ix[p]=Z[Sc]−1F0[Sc;Ω], so the precise probability-lane Fisher object is weighted and should not be conflated with the unweighted geometric audits REG0\mathrm{REG}_0REG0 or REG\mathrm{REG}REG; the control-space Fisher metric Iij(λ)=Cov⁡pλ(∂iSc,∂jSc)\mathcal{I}_{ij}(\lambda) = \operatorname{Cov}_{p_\lambda}(\partial_i S_c,\partial_j S_c)Iij(λ)=Covpλ(∂iSc,∂jSc) induces the natural protocol Fisher length and protocol action along a control path; no universal static single-state identity collapses entropy or Landauer cost into REG0\mathrm{REG}_0REG0 or F0\mathcal{F}_0F0. The paper is explicit about scope. It does not claim a new derivation of Landauer’s principle from the SGOC ledger alone, a completed read/write asymmetry theorem, a bulk-boundary theorem, or a many-body completion. Its claim is narrower and sharper: the thermodynamic lane of the capacity scalar can be written exactly in normalized capacity variables, with a clean separation between endpoint entropy, state-space Fisher localization, and protocol-space Fisher geometry. KeywordsLandauer principle; relative entropy; Fisher information; thermodynamic length; capacity geometry; normalized surprisal; protocol Fisher metric; entropy dissipation; gauge invariance; control-space geometry DOI10.5281/zenodo.19186309 Related SGOC programme records for interested readers:The Canonical Capacity Coordinate and the Unique Quadratic Tension in the Capacity Gauge, The Spectral Geometry of Coherence (SGOC), Volume Two, Part 1A, v2.0. DOI: 10.5281/zenodo.19156316 Localisation Rather than Saturation in Capacity Geometry: REG Dissipation, Forced Balance Laws, and a Restricted Ricci Bridge, The Spectral Geometry of Coherence (SGOC), Volume Two, Part 6A, v2.0. DOI: 10.5281/zenodo.19174434
This record contains Version 2.0 of The Schrödinger Equation from Capacity Geometry: General Forced-Action Theorem on a Fixed Capacity Background. Version 2.0 supersedes the earlier narrower local formulation (DOI: 10.5281/zenodo.19118007). The earlier record worked within a restricted quadratic-gradient density class. The present record proves the same result on the full local first-order homogeneous density class, with the weighted bulk-plus-flux bridge as the load-bearing structural principle rather than a minimality assumption on derivative order. The theorem lane is therefore broader, the claim boundaries are cleaner, and the companion-note dependence has been updated to reflect the current SGOC corpus. This record DOI. 10.5281/zenodo.19189901 should be treated as the source-of-record citation for the general fixed-background Schrödinger result. The paper proves a narrow but exact claim: within the full first-order homogeneous density class compatible with continuity-current structure, the Fisher-corrected Madelung action is the unique admissible action family up to the stated constant, and its Euler–Lagrange equations are exactly the Schrödinger equation. The decisive density correction is forced inside an upstream capacity-geometric theorem base rather than inserted by a diffusion or stochastic postulate. The logical scaffold is explicit and limited. Part 1A fixes the canonical logarithmic capacity scalar and the unique quadratic base tension. Parts 6 and 7A isolate the phase-blindness ceiling for the continuous quadratic sector. Part 6A sharpens the localisation-versus-smoothing and forced-balance framework. The present paper then shows that continuity-current compatibility fixes the phase sector, locality and first-order dependence force the full homogeneous density family, and a universal weighted bulk-plus-flux bridge with field-independent coefficients forces the Fisher form. The canonical member of that family is fixed by the bridge to the imported capacity scalar. In that precise sense the logical order at the Schrödinger layer is reversed: the geometric base comes first, and the Schrödinger action appears downstream of it. The claim is exact within its lane and no broader. This is a fixed-background, single-particle theorem stated away from nodal sets. It does not claim a many-body theory, a measurement theory, a relativistic completion, a full nodal-complement reconstruction theorem, or backreaction of the quantum sector on the background geometry. Appendix D records that on a nodal-complement component, once the phase-sensitive completion is an S¹-valued phase field, circulation quantisation and wavefunction reconstruction are automatic. Appendix G records a conditional H¹-closure lane inside the same fixed-background action. The discrete-curvature and branch-bookkeeping support used on nodal-complement triangulations belongs to the companion Closure Phase note, while the further complement-globalisation step belongs to the companion Relative Cohomology note. Keywords: Schrödinger equation; capacity geometry; Fisher information; Madelung action; phase-sensitive evolution; forced action; homogeneous density class; weighted Fisher bridge; REG; coherence scalar; fixed background; nodal complement; reproducibility Companion manuscripts cited in this paper's proof chain, from the SGOC programme: Part 1A: The Canonical Capacity Coordinate and the Unique Quadratic Tension in the Capacity Gauge. DOI: 10.5281/zenodo.19156316 Part 7A: The Second-Order Ceiling, Triadic Completion, and the Wilson-Triangle Lift. DOI: 10.5281/zenodo.19175902 Closure Phase as Discrete Curvature on a Triangulated 2-Complex. DOI: 10.5281/zenodo.19185885 Relative Cohomology and Cut-Graph Holonomy Trivialisation. DOI: 10.5281/zenodo.19185877 Additional provenance notes cited in the paper Part 6A: Localisation Rather than Saturation in Capacity Geometry: REG Dissipation, Forced Balance Laws, and a Restricted Ricci Bridge. DOI: 10.5281/zenodo.19174434 Landauer, Relative Entropy, and Fisher Length in Capacity Geometry. DOI: 10.5281/zenodo.19186309