A number of challenges to the standard Λ CDM model have been emerging during the past
few years as the accuracy of cosmological observations improves. In this review we discuss …

Horizon-scale images of black holes (BHs) and their shadows have opened an
unprecedented window onto tests of gravity and fundamental physics in the strong-field …

The double copy is, in essence, a map between scattering amplitudes in a broad variety of
familiar field and string theories. In addition to the mathematically rich intrinsic structure, it …

The non-linear dynamics of scalar fields coupled to matter and gravity can lead to
remarkable density-dependent screening effects. In this short review, we present the main …

We consider the recently proposed possibility that dark energy (DE) and baryons may
scatter through a pure momentum exchange process, leaving the background evolution …

The last few decades have provided abundant evidence for physics beyond the two
standard models of particle physics and cosmology. As is now known, the by far largest part …

We study a step-like transition in the value of the effective Planck mass (or effective
gravitational constant) on cosmological scales prior to recombination. We employ cosmic …

We revisit the flux of chameleons (light scalar particles which could play a role in the dark
energy phenomenon) produced in the interior of the Sun. Our novel analysis incorporates …

In this follow-up analysis, we update previous constraints on the transitional Planck mass
(TPM) modified gravity model using the latest version of EFTCAMB and provide new …

We embed linear and non-linear parametrizations of beyond standard cosmological physics
in the halo model reaction framework, providing a model-independent prescription for the …