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 …

Abstract Models where dark matter and dark energy interact with each other have been
proposed to solve the coincidence problem. We review the motivations underlying the need …

Determining the origin of structure in the universe is one of the most important open
problems in cosmology. CMB anisotropies sourced by early-universe density perturbations …

We study the decoupling process of neutrinos in the early universe in the presence of three-
flavour oscillations. The evolution of the neutrino spectra is found by solving the …

The search for the curl component (B mode) in the cosmic microwave background (CMB)
polarization induced by inflationary gravitational waves is described. The canonical single …

We present a comprehensive review of keV-scale sterile neutrino Dark Matter, collecting
views and insights from all disciplines involved—cosmology, astrophysics, nuclear, and …

This book lays out the scientific goals to be addressed by the next-generation ground-based
cosmic microwave background experiment, CMB-S4, envisioned to consist of dedicated …

We present Fisher matrix projections for future cosmological parameter measurements,
including neutrino masses, Dark Energy, curvature, modified gravity, the inflationary …

This is a report on the status and prospects of the quantification of neutrino properties
through the cosmological neutrino background for the Cosmic Frontier of the Division of …

Future cosmological measurements should enable the sum of neutrino masses to be
determined indirectly through their effects on the expansion rate of the Universe and the …