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Exact smooth coupled counterpoised dust and observables
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 of The Axiom of Countable Choice (), recorded as the mathematical premise [A2]. Use the selected smooth SI Einstein–Maxwell charged-dust model of [A1], with length coordinates and in metres, positive constants , , and . Use the positive-root convention of Explicit rational and real power regimes to set (units ). For an open , let be dimensionless and satisfy the Euclidean condition . On , use the coordinate metric, orientation, and time orientation Use the coordinate orientation . Define the smooth potential, field, dust velocity, rest-mass and rest-charge densities, current, and matter stress by where and the electromagnetic stress is the one adopted in [A1]. Then is smooth Lorentzian, is a future unit observer, is future timelike with , all displayed fields are smooth, and . This tuple satisfies every equation of the selected dust branch: , , , , , , and the adopted Einstein equation with . These are exact conditional model deductions. On the ratio is constant along ; no division by is made on . The observer electric components are , where , and the coordinate acceleration is , .
Here is rest-mass density in , is rest-charge density in , and the stress components have energy-density units . The orthonormal components of have tesla units and has units , under the SI convention of [A1].
The total stress satisfies the weak, null, dominant, and strong energy conditions pointwise: respectively for every future timelike ; for every nonzero future null ; is future causal or zero for every future timelike ; and the weak condition holds for .
For the spherical specialization on all , let be lengths, Then and everywhere. On a slice the induced spatial metric is and its volume measure is , where is Euclidean Lebesgue measure. Define the proper matter mass and signed charge by and . Both are finite, with The scalar curvature, meaning the trace of the Ricci tensor in the adopted convention, is . These proper integrals are not identified with an ADM mass or a measurement.
For with , put and define the positive linear density profile The same exact coupled solutions satisfy the entrywise Cartesian-coordinate bounds 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: , , , , , , , and the field conventions specified in the Statement.
Selected transported charged-dust Einstein–Maxwell model adopts the SI Einstein and smooth curved-Maxwell equations, , , the undivided mass-continuity and Lorentz-force equations, and charge-current conservation. It requires , , and at ; on positive-density open sets it defines and adopts its transport through . 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.
Exact smooth superharmonic counterpoised dust family: under , smooth positive with , the positive constants and either sign , the exact displayed fields are smooth, is future timelike, and . Its Statement gives the sourced and homogeneous Maxwell equations, dust stress exchange including the zero-density set, the Einstein equation, all four energy conditions, and , . The current draft is used only at these stated mathematical interfaces; continuity, undivided force balance and the observer electric components are checked locally below.
Globally regular sphere, proper integrals and dilute bounds: for and , the smooth density is everywhere positive; with the induced volume density , the proper integrals are finite and equal and . It gives and the displayed metric and density bounds for , . This is also a draft mathematical supplier and is used conditionally.
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 , , and . In particular every is zero.
The local coordinate formula for the exterior derivative gives , hence for .
Sums, scalar multiples, products and quotients: , , , and when gives the product and quotient differentiation rules. Explicit rational and real power regimes fixes the unique positive root and reciprocal integer powers; here and is the reciprocal of the strictly positive .
The mathematical background is exactly The Axiom of Countable Choice (): for every family of nonempty sets there is a function on with for each . This indexed premise is inherited by [F1] and [F2]; no full Axiom of Choice is assumed.
Proof
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 , 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.
All coefficients are independent of , and , . The component Leibniz rule for the connection of [F3] gives , including where . By [F4]–[F5], the potential in the Statement has and . Direct metric contraction makes unit future timelike and a positively oriented orthonormal spatial frame. Hence .
From [F3] and , and . Raising the spatial index in step 1.2 with gives , so . Both temporal components are zero. This proves the undivided force equation everywhere, including , without dividing by density.
The exact fields obey everywhere and the mass continuity proved in step 1.2. Thus . On the open set where , is constant, so . Where , the global formula gives ; the preceding undivided current identity still applies and no charge-to-mass ratio is defined there.
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 and the displayed profile. When , its analytic metric and density inequalities apply for every ; the scalar-curvature and strict-density claims follow from its displayed and formulas. These are conditional model observables, not measurements or an ADM-mass identification.
Depends on
Sums, scalar multiples, products and quotients: , , , and when
The local coordinate formula for the exterior derivative
Arbitrary-positive-H conformastatic Ricci and Einstein components
Explicit rational and real power regimes
The Axiom of Countable Choice ()
Selected transported charged-dust Einstein–Maxwell model
Exact smooth superharmonic counterpoised dust family
Globally regular sphere, proper integrals and dilute bounds
Dependency tree · 2 levels
Sources
- Reinhard Meinel and Moritz Hütten, On the black hole limit of electrically counterpoised dust configurations, arXiv:1105.3807v3 (2011), §2, equations (1)–(7), PDF pp. 2–3
- Sean M. Carroll, Lecture Notes on General Relativity, arXiv:gr-qc/9712019v1 (1997), complete 238-page lecture notes
- David Tong, General Relativity, University of Cambridge Part III, Michaelmas 2019, complete 290-page author-hosted lecture notes