We perform an extensive analysis of the statistics of axion masses and interactions in
compactifications of type IIB string theory, and we show that black hole superradiance …

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 …

A bstract We explore whether the axion which solves the strong CP problem can naturally be
much lighter than the canonical QCD axion. The\({Z} _ {\mathcal {N}}\) symmetry proposed …

We show that dark matter can be accounted for by an axion that solves the strong CP
problem, but is much lighter than usual due to a Z Script N symmetry. The whole mass range …

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 …

The main mechanism responsible for Axion-Like-Particle (ALP) production in the early
universe is the so-called misalignment mechanism. Three regimes have been investigated …

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 …

A bstract String theory has been claimed to give rise to natural fuzzy dark matter candidates
in the form of ultralight axions. In this paper we revisit this claim by a detailed study of how …

Abstract Axion-like particles (ALPs), a compelling candidate for dark matter (DM), are the
pseudo Nambu-Goldstone bosons of a spontaneously and explicitly broken global U (1) …