CosmoPhys

Cosmology Resource Materials

Wed, 10 Jun 2020 23:00:10 +0200

This page is now hosted on GitHub: https://github.com/jrdmb/cosmology-resource-materials

#cosmology

Cosmological Parameters

Wed, 20 Mar 2019 15:07:24 +0100

The graphic below is from Planck 2013 results. XVI. Cosmological parameters, Table 1 on page 6.

The graphic below is from Planck 2018 results. XVI. Cosmological parameters, Table 1 on page 14.

#cosmology

Cosmic Distance Ladder

Tue, 19 Mar 2019 23:07:45 +0100

The graphic below is from page 49 of the paper A 2.4% Determination of the Local Value of the Hubble Constant [arxiv:1604.01424]

Some articles about the cosmic distance ladder: Cosmology is in crisis about how to measure the universe, by Sarah Scoles Why Cosmology’s Expanding Universe Controversy Is An Even Bigger Problem Than You Realize, by Ethan Siegel

Other references: Slides from a talk by Stefano Casertano: Gaia DR2 and beyond: contributions to the local distance scale Additional materials from the Oct. 2018 KICP workshop: The Future of H₀: Crisis or Concordance

#cosmology #astrophysics

Probes of Dark Energy

Fri, 08 Feb 2019 18:43:59 +0100

Huterer and Shafer authored this excellent review paper: Dark energy two decades after: Observables, probes, consistency tests [arxiv:1709.01091]. They list 5 primary and 6 other probes for DE in Table 1, with details in section 5 and section 6 of the paper. An image clip of Table 1 is shown below.

From the wikipedia article on cosmic voids: “As the Sachs–Wolfe effect is only significant if the universe is dominated by radiation or dark energy, the existence of voids is significant in providing physical evidence for dark energy.”

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Graphic Images Illustrating the Hubble Constant Tension

Thu, 07 Feb 2019 22:30:45 +0100

The first graphic below is from an excellent Ethan Siegel article: This Is How Astronomers Will Resolve The Expanding Universe Controversy. It's a great overall review on this topic.

His comments on it: “Modern measurement tensions from the distance ladder (red) with early signal data from the CMB and BAO (blue) shown for contrast. It is plausible that the early signal method is correct and there’s a fundamental flaw with the distance ladder; it’s plausible that there’s a small-scale error biasing the early signal method and the distance ladder is correct, or that both groups are right and some form of new physics (shown at top) is the culprit. But right now, we cannot be sure.(ADAM RIESS (PRIVATE COMMUNICATION))”

Another one from this tweet. Photo by Cora Dvorkin.

#cosmology