The current cosmological model requires new physics beyond the standard model of
elementary particles and fields, such as dark matter and dark energy. Their nature is …

The observed pattern of linear polarization of the cosmic microwave background photons is
a sensitive probe of physics violating parity symmetry under inversion of spatial coordinates …

Black hole (BH) shadows can be used to probe new physics in the form of ultralight particles
via the phenomenon of superradiant instability. By directly affecting the BH mass and spin …

Gravitational waves (GWs) are an exciting new probe of physics beyond the standard
models of gravity and particle physics. One interesting possibility is provided by the so …

We revise gamma-ray limits on axion-like particles (ALPs) emitted from supernova SN1987A
based on Solar Maximum Mission data. We improve and simplify the computation of the …

The era of precision cosmology allows us to test the composition of the dark matter. Mixed
ultralight or fuzzy dark matter (FDM) is a cosmological model with dark matter composed of a …

While astrophysical and cosmological probes provide a remarkably precise and consistent
picture of the quantity and general properties of dark matter, its fundamental nature remains …

Ultralight axions and other bosons are dark matter candidates present in many high energy
physics theories beyond the Standard Model. In particular, the string axiverse postulates the …

A bstract We show that the strong CP problem is solved in a large class of compactifications
of string theory. The Peccei-Quinn mechanism solves the strong CP problem if the CP …

We show that the existence of clouds of ultralight particles surrounding black holes during
their cosmological history as members of a binary system can leave a measurable imprint on …