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Dyonic RN as adopted Einstein–Maxwell model

Physical scope

Conditional source-free RN model deduction for the equation-based smooth Einstein–Maxwell branch with zero cosmological constant and no material stress or current, on positive-radius static coordinate domains away from the roots. It excludes an asserted source at the removed center, a global potential in the magnetic-flux sector, an ADM/Komar identification, any maximal-extension result, observations, and empirical validity.

Statement

Let m∗>0 be an SI mass parameter, Qe∈R an SI electric charge parameter, and ΦB∈R an SI magnetic flux through an oriented sphere. Use SI and geometric solution parameter identifications to set

M=GNm∗c2,qe=GN4πε0c4 Qe,qm=4πGN/(μ0c4)4πΦB.

Thus M,qe,qm are real length parameters. Let J⊂(0,∞) be a nonempty open set on which f(r)=1−2M/r+(qe2+qm2)/r2 has no zero, and use the exact dyonic RN metric and smooth two-form of Dyonic Reissner-Nordström metric and field domains on Rx0×J×S2, with x0=ct. Write α=4πGN/(μ0c4), F=F/α, and

TabEM:=1μ0(FacFbc−14gabFcdFcd),κE:=8πGNc4.

In the equation-based physical model of Equation-based Einstein–Maxwell model, specialize to Λ=0, j=0, and Tm=0 on this domain. Conditional on the exact current draft statements and hypotheses of Full dyonic Reissner-Nordström electrovac verification and Sourced Maxwell sign and current conservation, the RN datum satisfies the adopted source-free equations

dF=0,∇agFab=0,Gab=κETabEM.

This is a conditional model deduction, not a claim that nature contains an RN object. The coordinate domain excludes r=0; the conclusion does not assign a regular source there or require a global potential when qm≠0.

Facts & Assumptions

Given: Positive SI constants GN,c,μ0, ε0=(μ0c2)−1, a positive SI mass parameter m∗, SI flux parameters Qe,ΦB, the smooth dyonic RN data on a nonempty positive-radius domain with f≠0, and the stated zero-source specialization.

[F1]

SI and geometric solution parameter identifications: M=GNm∗/c2, qe=GN/(4πε0c4) Qe, qm=αΦB/(4π), and F=αF with α=4πGN/(μ0c4)>0.

[F2]

Dyonic Reissner-Nordström metric and field domains: on Rx0×J×S2, f=1−2M/r+(qe2+qm2)/r2, g=−f(dx0)2+f−1dr2+r2γS2, and F=−qer−2dx0∧dr+qmωS2, with r>0 and f≠0.

[A1]

Equation-based Einstein–Maxwell model: select its zero-matter instance M0, with configuration set C0[g,F]={∗}, no matter-field variables, equations or additional constraints, and maps J0[g,F;∗]=0 and T0[g,F;∗]=0 to the smooth zero vector field and smooth zero symmetric covariant two-tensor on the stated domain. Thus Ψ=∗ is admissible and j=0, Tm=0. With Λ=0, the adopted equations are dF=0, ∇agFab=−μ0jb, and Gab+Λgab=κE(TabEM+Tabm).

[L1]

Full dyonic Reissner-Nordström electrovac verification: for the exact datum in [F2] and every formal GN,c,μ0>0, its current Statement gives dF=d(⋆gF)=0, S=0, and Gab=κETabEM for F=F/α. Its proof and mathematical suppliers remain draft and are not independently accepted; the current Step-1 record is authoring-ready, so this conclusion is used only conditionally.

[L2]

Sourced Maxwell sign and current conservation: its current Statement assumes the sourced divergence equation before stating the form-equation equivalence. Its Facts [F1]–[F3] specify the smooth oriented Lorentzian geometry, torsion-free metric connection and Hodge conventions. Its Proof 2.1 derives the pointwise identity d(⋆gF)=−ιvvolg, vb=∇agFab, using only smoothness and those geometric conventions; the equivalence clause is not used as a black-box implication here. The supplier is a draft proof without independent acceptance.

[L3]

Lorentzian exterior calculus and Hodge star: in signature (−,+,+,+) and the stated orientation, (⋆gF)ab=12(volg)abcdFcd for smooth two-forms. The metric-selected connection is torsion-free and metric-compatible under the geometric conventions of [L2]. The identity ∇volg=0 used below is derived locally in step 3.1.

[A2]

The Axiom of Countable Choice (ACω): the geometric flux convention inherited through [F1] uses only ACω, meaning each specified countable family of nonempty sets has a choice function. The finite tensor normalization and equation conversion below make no additional choice and use no full AC.

Proof

1.1givenF1F2A2algebra

By [F1], M,qe,qm are real lengths and α>0. The chosen inputs therefore give exactly the geometric parameters and rescaling in [F2], with no inference about an asymptotic conserved mass or angular momentum. The only inherited choice convention is [A2]; this finite substitution makes no choice.

2.1F2L1step 1.1

Apply the exact conditional statement [L1] to the RN datum [F2]. It gives dF=0, d(⋆gF)=0, zero scalar curvature, and Gab=κETabEM on every component of the stated f≠0 domain.

3.1L2L3step 2.1algebra

Put Vb:=∇agFab. In an oriented coordinate chart write volg=w dx0∧dx1∧dx2∧dx3 with w=∣det⁡(gab)∣; this coefficient follows from the defining value of the metric volume form on a positively oriented orthonormal basis and the determinant change-of-basis formula. Differentiating the determinant expansion gives ∂cw=12wgab∂cgab, while the Christoffel formula gives Γaca=12gab∂cgab because the other two terms cancel after interchanging their dummy indices. Hence (∇cvolg)0123=∂cw−Γacaw=0, so ∇volg=0. At any point p, choose a positively oriented orthonormal frame with metric matrix η=diag⁡(−1,1,1,1). Torsion-freeness gives (d⋆gF)abc=3∇[a(⋆gF)bc]. The component formula in [L3] has (⋆gF)ij=−ϵijkF0k and (⋆gF)0i=12ϵijkFjk, where ϵijk is alternating and ϵ123=+1. In this frame V0=∑i∇iF0i and Vk=−∇0F0k+∑i∇iFik. Substituting the displayed Hodge components into 3∇[a(⋆gF)bc] gives (d⋆gF)123=−V0,(d⋆gF)0ij=ϵijkVk. In the same oriented frame, (ιVvolg)123=V0 and (ιVvolg)0ij=−ϵijkVk, so these components establish d(⋆gF)∣p=−ιV(p)volg∣p. Step 2.1 gives d(⋆gF)=0. Since volg∣p is a nonzero four-form, V(p)↦ιV(p)volg∣p is an isomorphism TpM→Λ3Tp∗M, so V(p)=0. As p was arbitrary, ∇agFab=0 throughout the stated domain.

4.1A1step 2.1step 3.1∎

Under the zero-source specialization in [A1], the equations established in steps 2.1 and 3.1 are exactly the adopted equation-based Einstein–Maxwell system. They establish the claimed conditional solution on the stated domain, without asserting a source at the omitted center or an empirical realization.

Depends on

Dependency tree · 2 levels

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