A number of challenges to the standard Λ CDM model have been emerging during the past
few years as the accuracy of cosmological observations improves. In this review we discuss …

Despite its continued observational successes, there is a persistent (and growing) interest in
extending cosmology beyond the standard model, Λ CDM. This is motivated by a range of …

We report on the implications for cosmic inflation of the 2018 release of the Planck cosmic
microwave background (CMB) anisotropy measurements. The results are fully consistent …

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 present a catalog of galaxy clusters selected via their Sunyaev–Zel'dovich (SZ) effect
signature from 2500 deg 2 of South Pole Telescope (SPT) data. This work represents the …

The past two decades have seen transformative advances in cosmology and string theory.
Observations of the cosmic microwave background have revealed strong evidence for …

Advanced ACTPol is a polarization-sensitive upgrade for the 6 m aperture Atacama
Cosmology Telescope, adding new frequencies and increasing sensitivity over the previous …

The bulk of cosmic matter resides in a dilute reservoir that fills the space between galaxies,
the intergalactic medium (IGM). The history of this reservoir is intimately tied to the cosmic …

We describe the observations and resultant galaxy cluster catalog from the 2770 deg 2
SPTpol Extended Cluster Survey (SPT-ECS). Clusters are identified via the Sunyaev …

The polarized thermal emission from diffuse Galactic dust is the main foreground present in
measurements of the polarization of the cosmic microwave background (CMB) at …