5 papers
On-shell Homogeneous Curvature Modes in Quadratic Cosmology
Francisco Tello-Ortiz, B. Mishra, Y. Gómez-Leyton +1
5We study homogeneous cosmological perturbations in the quadratic model . Linearization of the modified Friedmann equation together with dust…
Black hole and wormhole branches in gravitational decoupling
Francisco Tello-Ortiz, Y. Gomez-Leyton, Vitalii Vertogradov +1
Minimal Geometric Deformation (MGD) applied to a static Schwarzschild black hole seed generates a single decoupler function , obtained by solving the -sector field equatio…
Area-product universality in multi-horizon black hole entropy
Francisco Tello-Ortiz, Y. Gómez-Leyton, Jean Báez Cuevas +1
Black-hole entropy and multi-horizon area-product relations represent two apparently distinct manifestations of universality, arising respectively from microscopic statistics and c…
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…
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…