arXiv subjects

Alberto García

Publications and source records attributed to Alberto García.

21 records · Page 2Linked to original sources

arXiv1999

Uniqueness theorems for static black holes in metric-affine gravity

Using the equivalence theorem for the triplet ansatz sector of metric-affine gravity (MAG) theories and the Einstein-Proca system, it is shown that the only static black hole of the triplet sector of MAG is the Schwarzschild solution, under the constraint (-4β_4 + k_1β_5/2k_0 + k_2γ_4/k_0)/κz_4 \neq 0 on the coupling constants. For the special case (-4β_4 + k_1β_5/2k_0 + k_2γ_4/k_0)/κz_4 = 0, it follows that the only static non-extremal black hole is the Reissner-Nordström one. The results can be extended to exclude also the existence of soliton solutions of the triplet sector of MAG.

gr-qc↗

arXiv1999

Regular Black Hole in General Relativity Coupled to Nonlinear Electrodynamics

The first regular exact black hole solution in General Relativity is presented. The source is a nonlinear electrodynamic field satisfying the weak energy condition, which in the limit of weak field becomes the Maxwell field. The solution corresponds to a charged black hole with |q| \leq 2 s_c m \approx 0.6 m, having the metric, the curvature invariants, and the electric field regular everywhere.

gr-qc↗

arXiv1997

Colliding waves in metric-affine gravity

We generalize the formulation of the colliding gravitational waves to metric-affine theories and present an example of such kind of exact solutions. The plane waves are equipped with five symmetries and the resulting geometry after the collision possesses two spacelike Killing vectors.

gr-qc↗