3 papers
gr-qc2026
Mass inflation or scalaron rigidity: Cauchy horizons in metric f(R)
Francisco S. N. Lobo, Maickol Muñoz-Palma, Francisco Tello-Ortiz
We develop a double-null framework for Cauchy-horizon dynamics in metric gravity that separates ordinary mass inflation from scalaron cancellation and genuine escape from th…
gr-qc2026
Horizon-regular cross-focusing and inner-horizon obstructions in spherical f(R) gravity
Maickol Muñoz-Palma, Francisco S. N. Lobo, Jean Báez Cuevas +1
We formulate a horizon-regular double-null criterion for regular inner marginal horizons in spherically symmetric metric gravity. Using normalized outgoing and ingoing radia…
gr-qc2026
Scalaron-modified null focusing and radial monotonicity in static f(R) gravity
Maickol Muñoz-Palma, Francisco S. N. Lobo, Jean Báez Cuevas +1
We derive an exact radial monotonicity law for static, spherically symmetric spacetimes in metric \(f(R)\) gravity. For \(ds^2=A(r)dt^2-dr^2/B(r)-r^2dΩ^2\), the matter contribution…