Abstract The Nobel Prize winning confirmation in 1998 of the accelerated expansion of our
Universe put into sharp focus the need of a consistent theoretical model to explain the origin …

Einstein's General Relativity (GR) is possibly one of the greatest intellectual achievements
ever conceived by the human mind. In fact, over the last century, GR has proven to be an …

Ultralight bosons can affect the dynamics of spinning black holes (BHs) via superradiant
instability, which can lead to a time evolution of the supermassive BH shadow. We study …

Black hole (BH) shadows can be used to probe new physics in the form of ultralight particles
via the phenomenon of superradiant instability. By directly affecting the BH mass and spin …

Recent cosmological observations have posed a challenge for traditional theories of gravity:
what is the force driving the accelerated expansion of the universe? What if dark energy or …

In this work we derive the junction conditions for the matching between two spacetimes at a
separation hypersurface in the perfect-fluid version of f (R, T) gravity, not only in the usual …

In this manuscript, we study the construction of static cylindrically symmetric thin shell
wormhole models with an electric charge in the background of f (R, T) gravity. We utilized …

In this work, we use reconstruction methods to obtain cosmological solutions in the recently
developed scalar-tensor representation of f (R, T) gravity. Assuming that matter is described …

This manuscript aims to establish the gravitational junction conditions for the f (G, T) gravity.
In this gravitational theory, f is an arbitrary function of Gauss-Bonnet invariant G and the …

The superradiant instability can lead to the generation of extremely dense axion clouds
around rotating black holes. We show that, despite the long lifetime of the QCD axion with …