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2013

New Constraints on the Early Expansion History

Hojjati, Alireza, Linder, Eric V., Samsing, Johan

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Cosmic microwave background measurements have pushed to higher resolution, lower noise, and more sky coverage.

These data enable a unique test of the early universe's expansion rate and constituents such as effective number of relativistic degrees of freedom and dark energy.
Using the most recent data from Planck and WMAP9, we constrain the expansion history in a model independent manner from today back to redshift z=10^5.
The Hubble parameter is mapped to a few percent precision, limiting early dark energy and extra relativistic degrees of freedom within a model independent approach to 2-16% and 0.71 equivalent neutrino species respectively (95% CL).

New Constraints on the Early Expansion History · Around

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Then

J. Samsing, E.V. Linder, T.L. Smith, Phys. Rev. D 86, 123504 (2012) [arXiv:1208.4845]
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R.R. Caldwell, S.S. Gubser, Phys. Rev. D 87, 063523 (2013) [arXiv:1302.1201]
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2013
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