Abstract The Event Horizon Telescope (EHT) Collaboration recently published the first
images of the supermassive black holes in the cores of the Messier 87 and Milky Way …

Previous works have argued that future gravitational-wave detectors will be able to probe
the properties of astrophysical environments where binaries coalesce, including accretion …

The fuzzy dark matter (FDM) model treats DM as a bosonic field with an astrophysically large
de Broglie wavelength. A striking feature of this model is O (1) fluctuations in the dark matter …

Scalar fields can give rise to confined structures, such as boson stars or Q-balls. These
objects are interesting hypothetical new “dark matter stars,” but also good descriptions of …

In this paper, we study the local observational consequences of a violation of the Einstein
equivalence principle induced by models of light scalar dark matter (DM). We focus on two …

Effective field theory methods suggest that some rather general extensions of general
relativity include, or are mimicked by, certain higher-order curvature corrections, with …

The interaction of binary black hole mergers with their environments can be studied using
numerical relativity simulations. These start only a short finite time before merger, at which …

Gravitational atoms produced from the superradiant extraction of rotational energy of
spinning black holes can reach energy densities significantly higher than that of dark matter …

We first show that the effective nonrelativistic theory of gravitationally interacting, massive
integer-spin fields (spin-0, 1, and 2 in particular) is described by a 2 s+ 1 component …

Numerical simulations show that a massive real scalar field in a nonlinear theory can form
long-lived oscillating localized states. For a self-interacting scalar on a fixed background …