A first-order nonlocal integro-differential system for the scalar field phi and curvature R is derived for f(R) gravity in spherical symmetry, extending Christodoulou's approach to allow analysis of solutions via hyperbolic equations.
De Felice and S.Tsujikawa , f(R) theories, Liv
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A first-order formulation of f(R) gravity in spherical symmetry
A first-order nonlocal integro-differential system for the scalar field phi and curvature R is derived for f(R) gravity in spherical symmetry, extending Christodoulou's approach to allow analysis of solutions via hyperbolic equations.