The discovery of cosmic acceleration has triggered a consistent body of theoretical work
aimed at modeling its phenomenology and understanding its fundamental physical nature …

We use the effective field theory of dark energy to explore the space of modified gravity
models which are capable of driving the present cosmic acceleration. We identify five …

Abstract We take an Effective Field Theory (EFT) approach to unifying existing proposals for
the origin of cosmic acceleration and its connection to cosmological observations. Building …

We propose a universal description of dark energy and modified gravity that includes all
single-field models. By extending a formalism previously applied to inflation, we consider the …

We propose a minimal description of single field dark energy/modified gravity within the
effective field theory formalism for cosmological perturbations, which encompasses most …

Observations provide increasingly strong evidence that the universe is accelerating. This
revolutionary advance in cosmological observations confronts theoretical cosmology with a …

We review and extend a novel approach that we recently introduced, to describe general
dark energy or scalar-tensor models. Our approach relies on an Arnowitt-Deser-Misner …

We implement the effective field theory (EFT) approach to dark energy and modified gravity
in the public Einstein-Boltzmann solver camb. The resulting code, which we dub eftcamb, is …

Recently, a full-shape analysis of large-scale structure (LSS) data was employed to provide
new constraints on a class of early dark energy models. In this paper, we derive similar …

Positivity bounds—constraints on any low-energy effective field theory imposed by the
fundamental axioms of unitarity, causality and locality in the UV—have recently been used to …