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.
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Simulations in Einstein-scalar-Gauss-Bonnet gravity show oscillons form with similar properties to standard cases but trigger EFT breakdown for large couplings via high local curvatures.
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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.
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Preheating and oscillon formation in Einstein-scalar-Gauss-Bonnet gravity
Simulations in Einstein-scalar-Gauss-Bonnet gravity show oscillons form with similar properties to standard cases but trigger EFT breakdown for large couplings via high local curvatures.