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Exact smooth coupled counterpoised dust and observables

Physical scope

Exact smooth solutions of the selected static SI Einstein–Maxwell–charged-dust model for positive superharmonic conformastatic profiles, together with one regular spherical profile and its induced-volume and dilute observables. The finely fixed charge-to-mass ratio belongs only to this family. No empirical realization, arbitrary-data coupled evolution, formation, or stability claim is made.

Statement

Assume the indexed Axiom of Countable Choice ACω of The Axiom of Countable Choice (ACω), recorded as the mathematical premise [A2]. Use the selected smooth SI Einstein–Maxwell charged-dust model of [A1], with length coordinates x0=ct and xi in metres, positive constants c,μ0,GN, ϵ0:=(μ0c2)−1, and κ:=8πGN/c4. Use the positive-root convention of Explicit rational and real power regimes to set Qs:=4πϵ0GN>0 (units C kg−1). For an open D⊆R3, let H∈C∞(D,(0,∞)) be dimensionless and satisfy the Euclidean condition ΔH:=∑i=13∂i2H≤0. On M:=Rx0×D, use the coordinate metric, orientation, and time orientation gH=−H−2(dx0)2+H2∑i=13(dxi)2,n:=H∂0 future,ei:=H−1∂i. Use the coordinate orientation dx0∧dx1∧dx2∧dx3. Define the smooth potential, field, dust velocity, rest-mass and rest-charge densities, current, and matter stress by A:=scQsH−1dx0,F:=dA,U:=cH∂0,ρ:=−c2ΔH4πGNH3,σ:=sQsρ,ja:=σUa,Tmab:=ρUaUb, where s∈{−1,+1} and the electromagnetic stress TabEM is the one adopted in [A1]. Then gH is smooth Lorentzian, n is a future unit observer, U=cn is future timelike with gH(U,U)=−c2, all displayed fields are smooth, and ρ≥0. This tuple satisfies every equation of the selected dust branch: dF=0, ∇aFab=−μ0jb, ∇a(ρUa)=0, ρUa∇aUb=σFbcUc, ∇aja=0, ∇aTmab=Fbcjc, and the adopted Einstein equation with Λ=0. These are exact conditional model deductions. On {ρ>0} the ratio σ/ρ=sQs is constant along U; no division by ρ is made on {ρ=0}. The observer electric components are Ei:=cF(ei,n)=−sc2Hi/(QsH2), where Hi:=∂iH, and the coordinate acceleration is a0=0, ai=−c2Hi/H3.

Here ρ is rest-mass density in kg m−3, σ is rest-charge density in C m−3, and the stress components have energy-density units J m−3. The orthonormal components of F have tesla units and Ei has units V m−1, under the SI convention of [A1].

The total stress Tab:=Tm,ab+TabEM satisfies the weak, null, dominant, and strong energy conditions pointwise: respectively T(v,v)≥0 for every future timelike v; T(ℓ,ℓ)≥0 for every nonzero future null ℓ; −Tabvb is future causal or zero for every future timelike v; and the weak condition holds for Tab−12(gcdTcd)gab.

For the spherical specialization on all R3, let a,b>0 be lengths, r2:=∑i=13(xi)2,Ψ:=r2+b2,H:=1+aΨ. Then ΔH=−3ab2/(r2+b2)5/2<0 and ρ=3c2ab2/[4πGNH3(r2+b2)5/2]>0 everywhere. On a slice Σ={x0=constant} the induced spatial metric is h=H2δijdxidxj and its volume measure is dVh=H3dλ3, where λ3 is Euclidean Lebesgue measure. Define the proper matter mass and signed charge by Mprop:=∫Σρ dVh and Qprop:=∫Σσ dVh. Both are finite, with Mprop=c2aGN,Qprop=sQsc2aGN. The scalar curvature, meaning the trace of the Ricci tensor in the adopted convention, is Sg=−2ΔH/H3>0. These proper integrals are not identified with an ADM mass or a measurement.

For a=δb with 0<δ≤1, put h0:=b/Ψ and define the positive linear density profile ρlin:=3c2δb34πGN(r2+b2)5/2. The same exact coupled solutions satisfy the entrywise Cartesian-coordinate bounds ∣g00+(1−2δh0)∣≤3δ2,∣gij−(1+2δh0)δij∣≤δ2,0≤1−ρρlin≤3δ. All these are ideal model statements, not observed data. The result does not assert physical realization, stability, formation, or a coupled initial-value theorem.

Facts & Assumptions

Given: ACω, D, H, s, c, μ0, GN, and the field conventions specified in the Statement.

[A1]

Selected transported charged-dust Einstein–Maxwell model adopts the SI Einstein and smooth curved-Maxwell equations, Tmab=ρUaUb, ja=σUa, the undivided mass-continuity and Lorentz-force equations, and charge-current conservation. It requires ρ≥0, g(U,U)=−c2, and σ=0 at ρ=0; on positive-density open sets it defines α=σ/ρ and adopts its transport through Ua∇aα=0. The Einstein–Maxwell equations are physical postulates, not deductions from mathematics or the cited literature. The selected branch excludes singular sources and makes no existence, stability, or empirical claim.

[F1]

Exact smooth superharmonic counterpoised dust family: under ACω, smooth positive H with ΔH≤0, the positive constants and either sign s, the exact displayed fields are smooth, U is future timelike, and ρ≥0. Its Statement gives the sourced and homogeneous Maxwell equations, dust stress exchange including the zero-density set, the Λ=0 Einstein equation, all four energy conditions, and a0=0, ai=−c2Hi/H3. The current draft is used only at these stated mathematical interfaces; continuity, undivided force balance and the observer electric components are checked locally below.

[F2]

Globally regular sphere, proper integrals and dilute bounds: for a,b>0 and H=1+a/r2+b2, the smooth density is everywhere positive; with the induced volume density H3dλ3, the proper integrals are finite and equal c2a/GN and sQsc2a/GN. It gives Sg=−2ΔH/H3 and the displayed metric and density bounds for a=δb, 0<δ≤1. This is also a draft mathematical supplier and is used conditionally.

[F3]

Arbitrary-positive-H conformastatic Ricci and Einstein components gives the unique torsion-free metric-compatible connection of the coordinate metric. Its only nonzero types are Γ00i=Γ0i0=−Hi/H, Γi00=−Hi/H5, and Γijk=(δijHk+δikHj−δjkHi)/H. In particular every Γaa0 is zero.

[F4]

The local coordinate formula for the exterior derivative gives d(Aa dxa)=∑adAa∧dxa, hence Fi0=∂iA0−∂0Ai for F=dA.

[A2]

The mathematical background is exactly The Axiom of Countable Choice (ACω): for every family (Xn)n∈N of nonempty sets there is a function f on N with f(n)∈Xn for each n. This indexed ACω premise is inherited by [F1] and [F2]; no full Axiom of Choice is assumed.

Proof

1.1givenA1A2F1F5

Under the Statement's hypotheses and [A2], the fields are exactly those in the Statement of [F1], with positive-root convention [F5]. Thus its stated conclusions give smooth Lorentzian normalization, nonnegative density, sourced and homogeneous Maxwell equations, dust stress exchange, the Einstein equation with Λ=0, and the four energy conditions. These equations have the directions and tensor conventions independently adopted in [A1]. The remaining continuity, undivided force and observer formulas are verified next.

1.2givenA2F3F4F5algebra

All coefficients are independent of x0, and U0=cH, Ui=0. The component Leibniz rule for the connection of [F3] gives ∇a(ρUa)=∂0(ρcH)+∑aΓaa0ρcH=0, including where ρ=0. By [F4]–[F5], the potential in the Statement has Fi0=−s(c/Qs)Hi/H2 and Fij=0. Direct metric contraction makes n=H∂0 unit future timelike and ei=H−1∂i a positively oriented orthonormal spatial frame. Hence Ei=cF(ei,n)=cFi0=−sc2Hi/(QsH2).

2.1givenA2F3step 1.2algebra

From [F3] and Ui=0, a0=0 and ai=(cH)2Γi00=−c2Hi/H3. Raising the spatial index in step 1.2 with gij=H−2δij gives Fi0=−s(c/Qs)Hi/H4, so σFicUc=sQsρFi0cH=−ρc2Hi/H3=ρai. Both temporal components are zero. This proves the undivided force equation everywhere, including ρ=0, without dividing by density.

3.1A1A2F1step 1.1step 1.2step 2.1algebra

The exact fields obey σ=sQsρ everywhere and the mass continuity proved in step 1.2. Thus ∇aja=∇a(sQsρUa)=sQs∇a(ρUa)=0. On the open set where ρ>0, α=σ/ρ=sQs is constant, so Ua∇aα=0. Where ρ=0, the global formula gives σ=0; the preceding undivided current identity still applies and no charge-to-mass ratio is defined there.

4.1givenA2F1F2step 1.1algebra∎

For the spherical profile, [F2] supplies the exact smooth solution, its induced metric volume density, and the stated finite proper mass and signed charge integrals. Its hypotheses are exactly a,b>0 and the displayed profile. When a=δb, its analytic metric and density inequalities apply for every 0<δ≤1; the scalar-curvature and strict-density claims follow from its displayed ΔH and Sg formulas. These are conditional model observables, not measurements or an ADM-mass identification.

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