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Exact smooth superharmonic counterpoised dust family
Statement
Assume as in The Axiom of Countable Choice (), as required by the currently inspected general geometric convention in Smooth formal matter, EM tensors and observer quantities. Let be open and let satisfy . Use , its coordinate orientation, and the time orientation for which is future, all as fixed in Positive-scalar conformastatic chart data and verified in The positive-scalar conformastatic chart tensor is Lorentzian. Use the metric and coordinates of Positive-scalar conformastatic chart data. Fix formal constants , put , , and define the positive charge-to-mass parameter using the positive root of Explicit rational and real power regimes. For a sign set Let be the covariant four-acceleration of the timelike field . Then is future timelike with , all displayed fields are smooth, and . On the charge-to-mass ratio is ; no ratio is defined by division at . The tuple satisfies the formal sourced Maxwell equations , , the dust matter exchange equation , and the formal Einstein equation with , where is exactly the tensor of Smooth formal matter, EM tensors and observer quantities. Its total stress satisfies WEC, NEC, SEC, and DEC. The coordinate four-acceleration of the static dust field is , , and its Lorentz force per unit mass balances it wherever ; the undivided exchange identity also holds where .
This is a conditional mathematical solution family for the stated formal equations. It makes no claim of physical realization, equilibrium stability, or coupled-field existence for arbitrary initial data.
Facts & Assumptions
Given: The open set , smooth positive with , constants , sign , and the coordinate data of the Statement.
Smooth formal matter, EM tensors and observer quantities defines the pointwise formal sourced Maxwell equations , , the matter-exchange equation , and the formal Einstein equation . It also defines a local potential by . This current draft definition is used only at these exact equation interfaces.
Explicit rational and real power regimes defines the unique positive square root and rational powers for positive real bases. Here is the unique positive root of , and negative integer powers of mean reciprocals.
Charged dust balance equivalence and advected charge ratio defines ; on a region where , the dust exchange equation is equivalent to continuity and force balance . Its statement makes no division-based conclusion at . This is the current draft theorem and is used only on its stated positive-density domain.
EM, dust and perfect-fluid energy inequalities: the Maxwell tensor and a charged-dust tensor with satisfy WEC, NEC, SEC, and DEC, and their sum retains each condition. This is the current draft theorem; no general matter positivity is assumed.
Positive-scalar conformastatic chart data defines , , , , and , with coordinate orientation and time orientation selected by .
The positive-scalar conformastatic chart tensor is Lorentzian gives the inverse metric, nondegeneracy, the future unit vector , the orthonormal spatial frame , and their orientation.
Arbitrary-positive-H conformastatic Ricci and Einstein components gives the coordinate connection and the arbitrary-positive- Ricci, scalar, and Einstein table in the curvature convention stated there.
Existence and uniqueness of the metric-selected connection of a nondegenerate metric, and its extension to tensor fields: for a smooth nondegenerate metric, there is a unique torsion-free metric-compatible connection with the Christoffel formula in the statement; its induced tensor derivative has the displayed component rule, including .
Sums, scalar multiples, products and quotients: , , , and when : differentiable real functions obey the product rule, so differentiating gives the reciprocal derivative used below.
The local coordinate formula for the exterior derivative: for a coordinate one-form , .
The exterior derivative squares to zero: for every smooth differential form , .
Smooth formal matter, EM tensors and observer quantities defines and in a positively oriented orthonormal tetrad uses .
Smooth formal matter, EM tensors and observer quantities defines charged dust by and , with , , and future-timelike satisfying .
The adopted background includes only as stated in The Axiom of Countable Choice (). The explicit global coordinates on and every finite component calculation below use no stronger choice principle.
Proof
Since is smooth and positive, its reciprocal is smooth by Positive-scalar conformastatic chart data; and make the positive root well-defined by [F2]. The chart tensor is a smooth Lorentzian metric with the stated orientation by [F5] and [F6]. Thus is future timelike, and the formulas define smooth ; they have the charged-dust form [F13], and gives .
Write . Differentiating in each spatial coordinate and using [F9] gives . The coordinate formula [F10] therefore gives the only nonzero covariant components and . Raising indices with [F6] gives and ; all vanish. Finally [F11] gives .
The connection used in the formal equations is the unique torsion-free metric-compatible connection by [F8]. The coefficients and compatibility of the local connection in [F7] were established in that item, so the two connections coincide; hence its component table may be used in the sourced equations below.
By the tensor derivative formula [F8], , and the final term is zero because is symmetric in while is antisymmetric. From [F7], and . Hence , because the two terms proportional to cancel.
The field has by [F13]. Its divergence is , since all fields are static. Its acceleration is and . Moreover , hence ; the temporal components of both sides are zero. This undivided relation holds at every point, including .
In the positively oriented orthonormal frame , from [F6], the electric components are and the magnetic components vanish because . In that frame , , , and . Substitution into the stress-tensor formula [F12] yields , , and . Using and gives and .
The right side of the time component of the sourced equation [F1] is by the definitions in the Statement. The definitions give by [F2], so ; this agrees with step 2.1. For each spatial , is static, , , and the symmetric-connection contraction is zero, so . Thus all sourced Maxwell components hold.
On the open set , step 2.2 verifies the two equivalent conditions in [F3], so the matter exchange equation [F1] follows there. At a point with , the already verified divergence in step 2.2 makes , while and because by [F13]. The product rule therefore proves the exchange equation on the zero-density set too.
In the same frame, and by [F13], so by the density in the Statement. Consequently the total components are and , with zero mixed components. In an orthonormal frame these numerical values equal the corresponding covariant components (the two time-index signs cancel), and they are exactly , and from [F7]. Thus the formal Einstein equation [F1] holds componentwise.
Since , [F4] applies to the Maxwell and dust tensors [F12, F13] separately and states that their sum satisfies WEC, NEC, SEC, and DEC. This is a conditional mathematical consequence of the formal model equations and the pointwise tensor definitions; it is not an empirical claim.
Remarks
The calculation checks every component of the formal Maxwell, dust-exchange, and Einstein equations. At , and the formulas reduce to the source-free Maxwell branch without division by the density. The result does not supply PDE existence, stability, or a physical postulate.
Depends on
Positive-scalar conformastatic chart data
The positive-scalar conformastatic chart tensor is Lorentzian
Arbitrary-positive-H conformastatic Ricci and Einstein components
Smooth formal matter, EM tensors and observer quantities
Explicit rational and real power regimes
The Axiom of Countable Choice ()
Charged dust balance equivalence and advected charge ratio
EM, dust and perfect-fluid energy inequalities
Existence and uniqueness of the metric-selected connection of a nondegenerate metric, and its extension to tensor fields
Sums, scalar multiples, products and quotients: , , , and when
The local coordinate formula for the exterior derivative
The exterior derivative squares to zero
Dependency tree · 2 levels
Sources
- Sean M. Carroll, Lecture Notes on General Relativity, arXiv:gr-qc/9712019v1 (1997), Ch. 3, equations (3.65)–(3.67), (3.90), (3.92), (3.95)
- David Tong, General Relativity, full author-hosted lecture notes, Michaelmas 2019, §§3.2.2 and 3.4.1
- 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