Cosmological Parameters

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Cosmological parameter results


The cosmological parameter results explore a variety of cosmological models with combinations of Planck and other data. We provide results from MCMC exploration chains, as well as best fits. Definitions, conventions and reference are contained in #planck2013-p11.

Production process

Parameter chains are produced using CosmoMC, a sampling package available from [1]. This includes the sample analysis package GetDist, and the scripts for managing and analysing the full grid or runs. Chain products provided here have had burn in removed. Some results with additional data are produced by importance sampling.

Caveats and known issues

Confidence intervals are derived from the MCMC samples, and assume the input likelihoods are exactly correct, so there is no quantification for systematic errors other than via the covariance, foreground and beam error models assumed in the likelihood codes. We had some issues producing reliable results from the minimizer used to produce the best fits, so in some cases the quoted fits may be significantly improved.

Related products

Results of the parameter exploration runs should be reproducible using CosmoMC with the Planck likelihood code.

File names

  • A pdf of the results in File:Grid 2sigma.pdf, which is suitable for human reading.
  • A text file is in … which is suitable for electronic reading.

The structure of the text file is … see e.g., Frequency Maps for sample tables


<biblio force=false>

  1. References