Potential Space Symmetries in Ernst-like Formulations of Einstein-Maxwell/ModMax-Scalar field Theories

Abstract

We complete the visible, hidden, sectorial, and discrete symmetries of Ernst-like potential spaces in stationary, axisymmetric Einstein-Maxwell-Scalar Field (EMSF) and Einstein-ModMax-Scalar Field (EMMSF) theories. In the real potential space \((f,ε,ψ,χ,κ)\), we determine the exact visible symmetries and their solvable Lie algebra. We characterize the hidden symmetries on invariant subspaces: Ehlers acts in the gravito-rotational sector, while electric and magnetic Harrison transformations act in static electromagnetic sectors. In the frozen EMMSF regime, \(v=v_0,\ w=w_0\), we show how EMSF sectorial transformations are deformed in ModMax theory. We also show that coexistence of electric and magnetic sectorial Harrison transformations imposes \(d w=0\) and \(d[(v^2+w^2)/w]=0\), selecting precisely the frozen ModMax sector. We study the Hamiltonian formulation, Noether charges, and Casimir invariants of the sectorial algebras. In harmonic branches of the \(A,B,C\) one-forms, the affine geodesic energy is constant, so the quadrature for \(k\) is controlled by the affine-geodesic Hamiltonian. The functions \(ω\) and \(A_φ\) follow from Noether charges along the Killing directions of \(ε\) and \(χ\), and are written using dual harmonic functions. We examine the electric and magnetic Lewis-Weyl-Papapetrou frames and their discrete map, which sends \(κ\mapstoκ^{-1}\), \(ψ\mapstoχ\), \(χ\mapsto-ψ\), and \(ε\mapstoε-ψχ\). Finally, we apply the sectorial transformations to harmonic scalar--acuum Weyl seeds with independent gravitational and scalar harmonics. Frozen-ModMax Harrison maps generate charged branches, while Ehlers generates the gravito-rotational branch. For these solutions we give the final quadratures for \(k\), \(ω\), and \(A_φ\).