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New constraints on the early expansion history of the universe

Title
New constraints on the early expansion history of the universe
Authors
Hojjati A.Linder E.V.Samsing J.
Ewha Authors
Eric V. Linder
Issue Date
2013
Journal Title
Physical Review Letters
ISSN
0031-9007JCR Link
Citation
vol. 111, no. 4
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
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=105. 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% C.L.). Within dark radiation, barotropic ether, and Doran-Robbers models, the early dark energy constraints are 3.3%, 1.9%, and 1.2%, respectively. © 2013 American Physical Society.
DOI
10.1103/PhysRevLett.111.041301
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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