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 …

Positivity bounds—the consequences of requiring a unitary, causal, local UV completion—
place strong restrictions on theories of dark energy and/or modified gravity. We derive and …

Low-energy effective field theories containing a light scalar field are used extensively in
cosmology, but often there is a tension between embedding such theories in a healthy UV …

The effective field theory of cosmic acceleration systematizes possible contributions to the
action, accounting for both dark energy and modifications of gravity. Rather than making …

We consider the consequences of having no prior knowledge of the true dark energy model
for the interpretation of cosmological observations. The magnitude of redshift-space …

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 …

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

Dark energy constraints have forced viable alternatives that differ substantially from a
cosmological constant Λ to have an equation of state w that evolves across the phantom …

The tension between measurements of the Hubble constant obtained at different redshifts
may provide a hint of new physics active in the relatively early universe, around the epoch of …

We extend and explore the general non-relativistic effective theory of dark matter (DM) direct
detection. We describe the basic non-relativistic building blocks of operators and discuss …