Static Einstein-Scalar Reconstruction: Compatibility and Descent

Abstract

Prescribing both the areal-radius metric function $F(r)$ and the scalar profile $\ddot{I}•(r)$ generally overdetermines static Einstein-scalar reconstruction. The temporal and radial Einstein equations determine a redshift function and an algebraic radial source $V_{\mathrm{alg}}(r)$, but do not by themselves impose the angular equation or guarantee a single-valued scalar potential. On a connected static interval we formulate the corresponding membership criterion for independently prescribed pairs: a potential-independent residual $\mathcal{C}[F,\ddot{I}•]$ must vanish, and $V_{\mathrm{alg}}$ must descend across the full scalar image to one branch-independent $C^1$ potential, with stationarity at values attained on constant-profile intervals. The compatibility and descent requirements are independent. As a positive benchmark, the criterion recovers the logarithmic Matos-Guzmán-Núñez scalar halo with its exponential potential. At a radially regular center we compute the leading scalar backreaction on $F$. Applied to a rational kink profile with rational curvature interpolation, exact compatibility forces the scalar amplitude to vanish for every integer $n\ge 2$, giving an ansatz-specific compatibility obstruction rather than a no-hair or classification theorem.

19 pages, no figures; substantial rewrite: previous closed-form black-hole construction superseded by a static Einstein-scalar compatibility/descent criterion and rational-family obstruction