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CMB-S4 Science Case, Reference Design, and Project Plan

Kevork N. Abazajian, +224 more
TLDR
In this article, the authors present the science case, reference design, and project plan for the Stage-4 ground-based cosmic microwave background experiment CMB-S4, as well as the experimental data.
Abstract
We present the science case, reference design, and project plan for the Stage-4 ground-based cosmic microwave background experiment CMB-S4.

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Snowmass2021 - Letter of interest cosmology intertwined II: The hubble constant tension

Eleonora Di Valentino, +94 more
TL;DR: In this article, the authors focus on the 4.4σ tension between the Planck estimate of the Hubble constant H0 and the SH0ES collaboration measurements and discuss how the next decade's experiments will be crucial.
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Early dark energy does not restore cosmological concordance

TL;DR: In this paper, a new component in the early universe, which initially acts as "early dark energy" (EDE), was introduced, thus decreasing the physical size of the sound horizon imprinted in the cosmic microwave background (CMB) and increasing the inferred Hubble constant.
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Solar-mass primordial black holes explain NANOGrav hint of gravitational waves

TL;DR: In this article, the NANOGrav collaboration for the pulsar timing array (PTA) observation recently announced evidence of an isotropic stochastic process, which may be the first detection of the Stochastic Gravitational Wave (GW) background.
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Refined Bounds on MeV-scale Thermal Dark Sectors from BBN and the CMB

TL;DR: In this article, the authors carried out an exhaustive and precise analysis of the implications of MeV-scale BSM particles in Big Bang Nucleosynthesis (BBN) and for Cosmic Microwave Background (CMB) observations.
References
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Review of Particle Physics

Keith A. Olive, +225 more
- 01 Aug 2014 - 
TL;DR: The review as discussed by the authors summarizes much of particle physics and cosmology using data from previous editions, plus 3,283 new measurements from 899 Japers, including the recently discovered Higgs boson, leptons, quarks, mesons and baryons.
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A new type of isotropic cosmological models without singularity

TL;DR: In this paper, the Einstein equations with quantum one-loop contributions of conformally covariant matter fields are shown to admit a class of nonsingular isotropic homogeneous solutions that correspond to a picture of the universe being initially in the most symmetric (de Sitter) state.
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Planck 2018 results. VI. Cosmological parameters

Nabila Aghanim, +232 more
TL;DR: In this article, the authors present cosmological parameter results from the full-mission Planck measurements of the cosmic microwave background (CMB) anisotropies, combining information from the temperature and polarization maps and the lensing reconstruction.
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