Model Independent Early Expansion History and Dark Energy - INSPIRE

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Model Independent Early Expansion History and Dark Energy

Johan Samsing
(
- UC, Berkeley and
- Bohr Inst.
)
,
Eric V. Linder
(
- UC, Berkeley and
- Ewha Women's U., Seoul
)
,
Tristan L. Smith
(
- UC, Berkeley
)

Aug, 2012

11 pages

Published in:

Phys.Rev.D 86 (2012) 123504

e-Print:

1208.4845 [astro-ph.CO]

DOI:

10.1103/PhysRevD.86.123504

View in:

ADS Abstract Service

reference search17 citations

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Abstract: (arXiv)

We examine model independent constraints on the high redshift and prerecombination expansion history from cosmic microwave background observations, using a combination of principal component analysis and other techniques. This can be translated to model independent limits on early dark energy and the number of relativistic species

N_{\rm eff}

. Models such as scaling (Doran-Robbers), dark radiation (

\Delta N_{\rm eff}

), and barotropic aether fall into distinct regions of eigenspace and can be easily distinguished from each other. Incoming CMB data will map the expansion history from

z=0

--

10^5

, achieving subpercent precision around recombination, and enable determination of the amount of early dark energy and valuable guidance to its nature.

Note:

11 pages, 8 figures

95.36.+x
98.80.Cq
redshift: high
dark energy
cosmic background radiation
principal component analysis
recombination
dark matter
numerical calculations
power spectrum: temperature

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Figures(12)

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