The simplest ΛCDM model provides a good fit to a large span of cosmological data but
harbors large areas of phenomenology and ignorance. With the improvement of the number …

The 15 yr pulsar timing data set collected by the North American Nanohertz Observatory for
Gravitational Waves (NANOGrav) shows positive evidence for the presence of a low …

Dark matter interactions with electrons or protons during the early Universe leave imprints
on the cosmic microwave background and the matter power spectrum, and can be probed …

The Simons Observatory (SO) is a new cosmic microwave background experiment being
built on Cerro Toco in Chile, due to begin observations in the early 2020s. We describe the …

We perform a comprehensive study of Milky Way (MW) satellite galaxies to constrain the
fundamental properties of dark matter (DM). This analysis fully incorporates inhomogeneities …

The Hubble tension has now grown to a level of significance which can no longer be
ignored and calls for a solution which, despite a huge number of attempts, has so far eluded …

CMB-S4 Science Case, Reference Design, and Project Plan Page 1 CMB-S4 Science Case,
Reference Design, and Project Plan CMB-S4 Collaboration July 9, 2019 arxiv:1907.04473v1 …

A bstract We consider the constraints from Supernova 1987A on particles with small
couplings to the Standard Model. We discuss a model with a fermion coupled to a dark …

The Lyman-α forest 1D flux power spectrum is a powerful probe of several cosmological
parameters. Assuming a ΛCDM cosmology including massive neutrinos, we find that the …

All attempts to directly detect particle dark matter (DM) scattering on nuclei suffer from the
partial or total loss of sensitivity for DM masses in the GeV range or below. We derive novel …