Journal
PHYSICAL REVIEW D
Volume 86, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.86.123504
Keywords
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Funding
- World Class University through the National Research Foundation, Ministry of Education, Science and Technology of Korea [R32-2009-000-10130-0]
- Office of Science, Office of High Energy Physics, of the U.S. Department of Energy [DE-AC02-05CH11231]
- Danish National Research Foundation
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We examine model independent constraints on the high redshift and prerecombination expansion history from upcoming 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-eff. Models such as scaling (Doran-Robbers), dark radiation (Delta N-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.
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