Abstract Spherically symmetric solutions of theories gravity built one fundamental class to describe compact objects like black holes and stars. Moreover, they serve as starting point for the search more realistic axially which are capable rotating objects. Theories that do not possess spherically meet all observational constraints easily falsified. In this article, we discuss classes exact per...

We develop an effective Gauss-Bonnet extension of Loop Quantum Cosmology, by introducing holonomy corrections in modified F (G) theories of gravity. Within the context of our formalism, we provide a perturbative expansion in the critical density, a parameter characteristic of Loop Quantum Gravity theories, and we result in having leading order corrections to the classical F (G) theories of grav...

We consider some models of f(R) gravity that can be used to describe, in a suitable weak-field limit, the gravitational field of the Sun. Using a perturbative approach, we focus on the impact that the modifications of the gravitational field, due to the non-linearity of the gravity Lagrangian, have on the Solar System dynamics. We compare the theoretical predictions for the precession of the lo...

The Kerr-Schild-Kundt (KSK) metrics are known to be one of the universal in general relativity, which means that they solve vacuum field equations any gravity theory constructed from curvature tensor and its higher-order covariant derivatives. There is yet no complete proof these presence matter fields such as electromagnetic and/or scalar fields. In order get some insight into what happens whe...

Abstract In this paper we introduce a new public Einstein-Boltzmann solver, MGCLASS II , built as modification of the publicly available CLASS code, that allows to obtain cosmological observables in Modified Gravity theories. It implements several commonly used parameterizations deviations from General Relativity, computing their impact on growth structure well background evolution Universe, to...