Compact objects occupy a pivotal role in the exploration of Nature. The interest spans from
the role of compact objects in astrophysics to their detection through various methods …

Axions are some of the best motivated particles beyond the Standard Model. We show how
the attractive self-interactions of dark matter (DM) axions over a broad range of masses, from …

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 …

Oscillons are extremely long-lived, spatially-localized field configurations in real-valued
scalar field theories that slowly lose energy via radiation of scalar waves. Before their …

We study novel solitonic solutions to Einstein-Klein-Gordon theory in the presence of a
periodic scalar potential arising in models of axion-like particles. The potential depends on …

In a galactic halo like the Milky Way, bosonic dark matter particles lighter than about 100 eV
have a de Broglie wavelength larger than the average inter-particle separation and are …

We investigate the formation, gravitational clustering, and interactions of solitons in a self-
interacting, nonrelativistic scalar field in an expanding universe. Rapid formation of a large …

Measurements of the dynamical environment of supermassive black holes (SMBHs) are
becoming abundant and precise. We use such measurements to look for ultralight dark …

Analytic arguments and numerical simulations show that bosonic ultralight dark matter
(ULDM) would form cored density distributions (“solitons”) at the center of galaxies. ULDM …

By exploiting the extreme environment of the black hole (BH) as a potential place for axion-
photon interaction, we use an axion-producing model of the magnetized plasma to study the …