3 papers
gr-qc2026
Perturbative vacuum constraints in higher-curvature gravity: Schwarzschild deformations and strong-field observables
Gustavo Melgarejo, Daniel Molano, Jonathan Ramírez
Higher-curvature terms modify the action but do not necessarily generate new vacuum geometries on the branch perturbatively connected to GR. We develop a first-order framework for…
gr-qc2026
Another Look at the Weak-Field Limit of Generalized Hybrid Metric-Palatini Gravity
Gustavo Melgarejo, Santiago Esteban Perez Bergliaffa
We investigate the weak-field regime of generalized hybrid metric-Palatini theories, described by a generic function \(f(R,\mathcal{R})\), where \(R\) is the metric Ricci scalar an…
gr-qc2026
On the Metric Propagator and Affine Modes of Extended Hybrid Metric--Palatini Gravity with Ricci--Squared Invariants
Jonathan RamÃrez, Jonathan Ramírez, Gustavo Melgarejo
We investigate an extended hybrid metric--Palatini theory defined by an arbitrary function , where and are the metric and…