Abstract The Laser Interferometer Space Antenna (LISA) has two scientific objectives of
cosmological focus: to probe the expansion rate of the universe, and to understand …

Abstract The Laser Interferometer Space Antenna (LISA) has the potential to reveal wonders
about the fundamental theory of nature at play in the extreme gravity regime, where the …

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 …

In the broad subclass of Horndeski theories with a luminal speed of gravitational waves, we
derive gravitational waveforms emitted from a compact binary by considering the wave …

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 …

In a subclass of Horndeski theories with the speed of gravity equivalent to that of light, we
study gravitational radiation emitted during the inspiral phase of compact binary systems …

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 …

Neutron stars (NSs) are excellent natural laboratories to constrain gravity on strong field
regime and nuclear matter in extreme conditions. Motivated by the recent discovery of a …

We examine f (R, Matter) theories that directly couple the curvature R or R μν with the matter
sector in the action, in addition to the universal coupling. We argue that if the matter sector …

New light scalar degrees of freedom may alleviate the dark matter and dark energy
problems, but if coupled to matter, they generally mediate a fifth force. In order for this fifth …