7 papers
Rotating near-horizon extreme geometries in quadratic gravity
Breno L. Giacchini, Ivan Kolář
Rotating near-horizon extreme solutions of quadratic gravity are analyzed combining power series expansions and numerical calculations. Restricting to geometries with symmetries of…
Static spherically symmetric Kundt vacuum solutions of higher-derivative gravities
Breno L. Giacchini, Ivan KoláÅ, VojtÄch Pravda +1
We study static spherically symmetric Kundt solutions to the vacuum field equations of quadratic gravity with a cosmological constant, as well as specific models of six-derivative…
Neglected solutions in quadratic gravity
Breno L. Giacchini, Ivan KoláÅ
We report on several previously overlooked families of static spherically symmetric solutions in quadratic gravity. Our main result concerns the existence of solutions whose leadin…
Spherically symmetric solutions in quasi-local Einstein-Weyl gravity
Johanna Borissova, Breno L. Giacchini, Aaron Held
Quantum-gravitational effective actions with higher-derivative and non-local operators are expected to regularize the singularities of general relativity. Here we focus on quasi-lo…
Effective delta sources and Newtonian limit in nonlocal gravity
Thomas M. Sangy, Nicolò BurzillÃ, Breno L. Giacchini +1
We investigate the Newtonian limit of a class of nonlocal gravity models with exponential form factors . Our main goal is to identify simi…
Black holes and other exact solutions in six-derivative gravity
Breno L. Giacchini, Ivan KoláÅ
We study exact static spherically symmetric vacuum solutions in generic six-derivative gravity (i.e., without assuming specific relations between the coupling constants). Using mod…