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gr-qc2026
Gravitational Field of a Rotating Mass on an Expanding Universe
Antonio Peña Peña
We present a new exact solution to Einstein's field equations that unifies the Kerr black hole with Friedmann-Lemaître-Robertson-Walker cosmology. This metric reduces to Kerr-de Si…
gr-qc2025
A Modified Gravitational Theory of the Matter Sector of the Type
Gines R. Pérez Teruel, Antonio Peña Peña
We investigate a modified gravity framework where the geometric Einstein--Hilbert sector remains untouched while the matter Lagrangian is weighted by a nontrivial function o…