J.A. de Wet, Icosahedral Symmetry and Quantum Gravity, Volume 2, Advanced Trends in Mathematics (Volume 2)
https://www.scipress.com/ATMath.2.33
Abstract:
    In this note we will show that Theta functions are a solution of the icosahedron equation and also a solution of the Ernst equation for the stationary axisymmetric case of Einstein’s gravitational equation.
Keywords:
    Gravity, Icosahedron, Jacobi Theta Functions, Riemann Surfaces