We review the landscape of QCD axion models. Theoretical constructions that extend the
window for the axion mass and couplings beyond conventional regions are highlighted and …

Axions and other very light axion-like particles appear in many extensions of the Standard
Model, and are leading candidates to compose part or all of the missing matter of the …

In this work we present several characteristic examples of theories of gravity and particle
physics scenarios that may yield an observable energy spectrum of stochastic primordial …

The nature of dark matter and properties of neutrinos are among the most pressing issues in
contemporary particle physics. The dual-phase xenon time-projection chamber is the …

It is commonly assumed that the energy density of the Universe was dominated by radiation
between reheating after inflation and the onset of matter domination 54,000 years later …

Searches for dark matter decaying into photons constrain its lifetime to be many orders of
magnitude larger than the age of the Universe. A corollary statement is that the abundance …

Increasingly stringent limits from LHC searches for new physics, coupled with lack of
convincing signals of weakly interacting massive particle (WIMP) in dark matter searches …

The axion is a promising dark matter candidate, which was originally proposed to solve the
strong-CP problem in particle physics. To date, the available parameter space for axion and …

We consider the case of very low reheating scenarios [T RH∼ O (MeV)] with a better
calculation of the production of the relic neutrino background (with three-flavor oscillations) …

A bstract Many motivated extensions of the Standard Model predict the existence of cosmic
strings. Gravitational waves originating from the dynamics of the resulting cosmic string …