We review applications of string theory to cosmology, from primordial times to the present-
day accelerated expansion. Starting with a brief overview of cosmology and string …

In this paper, we present an overview of recent developments in the numerical solution of
Horndeski gravity theories, which are the class of all scalar–tensor theories of gravity that …

We report evidence for nonlinear modes in the ringdown stage of the gravitational waveform
produced by the merger of two comparable-mass black holes. We consider both the …

A bstract Using a heavy-mass effective field theory (HEFT), we study gravitational-wave
emission in the scattering of two spinless black holes or neutron stars of arbitrary masses at …

For dark matter to be detectable with gravitational waves from binary black holes, it must
reach higher than average densities in their vicinity. In the case of light (wavelike) dark …

Gravitational waves can provide crucial insights about the environments in which black
holes live. In this work, we use numerical relativity simulations to study the behavior of self …

The majority of extensions to general relativity (GR) display mathematical pathologies—
higher derivatives, character change in equations that can be classified within partial …

Massive vector fields feature in several areas of particle physics, eg, as carriers of weak
interactions, dark matter candidates, or an effective description of photons in a plasma. Here …

Cold dark matter axions produced in the post-inflationary Peccei-Quinn symmetry breaking
scenario serve as clear targets for their experimental detection, since it is in principle …

We show that the most general scalar-tensor theory of gravity up to four derivatives in 3+ 1
dimensions is well-posed in a modified version of the CCZ4 formulation of the Einstein …