Cosmological observations are used to test for imprints of an ultralight axionlike field (ULA),
with a range of potentials V (ϕ)∝[1-cos (ϕ/f)] n set by the axion-field value ϕ and decay …

The last decade witnessed an increasing interest in axions and axion-like particles with
many theoretical works published and many new experimental proposals that started a real …

The QCD axion was originally predicted as a dynamical solution to the strong CP problem.
Axion like particles (ALPs) are also a generic prediction of many high energy physics …

It has been shown that the observed dark matter (DM) abundance can be produced by
amplification of quantum fluctuations of an energetically subdominant scalar field during …

The axion, a pseudoscalar particle originally introduced by Peccei, Quinn [1, 2], Weinberg
[3], and Wilczek [4] to solve the “strong CP problem”, is a well motivated dark-matter (DM) …

We posit the existence of the Marshland within string theory. This region is the boundary
between the landscape of consistent low-energy limits of quantum gravity, and the …