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Bejarano, Cecilia ; Delhom, Adria ; Jimenez Cano, Alejandro ; Olmo, Gonzalo J. ; Rubiera García, Diego | Elsevier Science BV | 2020-03-10Projective invariance is a symmetry of the Palatini version of General Relativity which is not present in the metric formulation. The fact that the Riemann tensor changes nontrivially under projective transformations implies that, unlike in the [...]texto impreso
We work out the junction conditions forf(R) gravity formulated in metric-affine (Palatini) spaces using a tensor distributional approach. These conditions are needed for building consistent models of gravitating bodies with an interior and exter[...]texto impreso
General relativity yields an analytical prediction of a minimum required mass of roughly similar to 0.08-0.09 M-circle dot for a star to stably burn sufficient hydrogen to fully compensate photospheric losses and, therefore, to belong to the mai[...]texto impreso
We find multicenter (Majumdar-Papapetrou type) solutions of Eddington-inspired Born-Infeld gravity coupled to electromagnetic fields governed by a Born-Infeld-like Lagrangian. We construct the general solution for an arbitrary number of centers [...]texto impreso
Afonso, Victor I. ; Olmo, Gonzalo J. ; Orazi, Emanuele ; Rubiera García, Diego | IOP Publishing | 2019-12Taking advantage of a previously developed method, which allows to map solutions of General Relativity into a broad family of theories of gravity based on the Ricci tensor (Ricci-based gravities), we find new exact analytical scalar field soluti[...]texto impreso
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Guerrero Roman, Merce ; Mora Pérez, Gerardo ; Olmo, Gonzalo J. ; Orazi, Emanuele ; Rubiera García, Diego | IOP publishing ltd | 2020-07We find an exact, rotating charged black hole solution within Eddington-inspired Born-Infeld gravity. To this end we employ a recently developed correspondence or mapping between modified gravity models built as scalars out of contractions of th[...]texto impreso
The understanding of stellar structure represents the crossroads of our theories of the nuclear force and the gravitational interaction under the most extreme conditions observably accessible. It provides a powerful probe of the strong field reg[...]texto impreso
Lobo, Francisco S. N. ; Olmo, Gonzalo J. ; Orazi, Emanuele ; Rubiera García, Diego ; Rustam, Azmat | Amer Physical Soc | 2020-11-06We study the structure and stability of traversable wormholes built as (spherically symmetric) thin shells in the context of Palatini f(R) gravity. Using a suitable junction formalism for these theories we find that the effective number of degre[...]
