Pulsar Timing Array experiments probe the presence of possible scalar or pseudoscalar
ultralight dark matter particles through decade-long timing of an ensemble of galactic …

We report the discovery of Mothra, an extremely magnified monster star, likely a binary
system of two supergiant stars, in one of the strongly lensed galaxies behind the galaxy …

(Abridged) Fundamental tensions between observations and dark-matter based
cosmological models have emerged. This updated review has two purposes: to explore new …

We present JWST/NIRSpec observations of a highly magnified star candidate at a
photometric redshift of z phot≃ 4.8, previously detected in JWST/NIRCam imaging of the …

Dark matter is undoubtedly one of the fundamental, albeit unknown, components of the
standard cosmological model. The failure to detect weakly interacting massive particles, the …

We present the operating principle and the first observing run of a novel kind of direct
detector for axions and axionlike particles in the galactic halo. Sensitive to the polarisation …

ABSTRACT SDSS J1004+ 4112 is a well-studied gravitational lens with a recently
measured time delay between its first and fourth arriving quasar images. Using this new …

Dark matter subhalos with extended profiles and density cores, and globular star clusters of
mass 10 6–10 8 M⊙ that live near the critical curves in galaxy cluster lenses can potentially …

Ultralight dark matter (ULDM) is one of the most promising DM candidates. Because of the
Bose enhancement, we find the annihilation rate of ULDM in the presence of background …

I present an introduction and topical review on axions as a dark matter candidate. Emphasis
is placed on issues surrounding the cosmology of axion dark matter that are relevant for …