Abstract Models where dark matter and dark energy interact with each other have been
proposed to solve the coincidence problem. We review the motivations underlying the need …

Mimetic gravity is a Weyl‐symmetric extension of General Relativity, related to the latter by a
singular disformal transformation, wherein the appearance of a dust‐like perfect fluid can …

We construct an analytically solvable simplified model that captures the essential features
for primordial black hole (PBH) production in most models of single-field inflation. The …

We study new consistent scalar-tensor theories of gravity recently introduced by Langlois
and Noui with potentially interesting cosmological applications. We derive the conditions for …

We consider all degenerate scalar-tensor theories that depend quadratically on second-
order derivatives of a scalar field, which we have identified in a previous work. These …

In this work, we analyse static spherically symmetric solutions in the framework of mimetic
gravity, an extension of general relativity where the conformal degree of freedom of gravity is …

In this paper, we present an introduction to cosmic inflation in the framework of Palatini
gravity, which provides an intriguing alternative to the conventional metric formulation of …

In the framework of classical scale invariance, we consider quadratic gravity in the Palatini
formalism and investigate the inflationary predictions of the theory. Our model corresponds …

We present a detailed investigation of the dynamical behavior of mimetic gravity with a
general potential for the mimetic scalar field. Performing a phase-space and stability …

We study secondary gravitational wave production in Horndeski gravity when the scalar field
dominates the very early universe. We find that higher derivative interactions easily …