Constraining Dark Energy Through the Late Integrated Sachs-Wolfe Effect

Details Constraining Dark Energy Through the Late Integrated Sachs-Wolfe Effect Constraining Dark Energy Through the Late Integrated Sachs-Wolfe Effect

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.9109b&link_type=abstract

American Astronomical Society, AAS Meeting #211, #91.09; Bulletin of the American Astronomical Society, Vol. 39, p.885

Astronomy and Astrophysics

Astronomy

Scientific paper

Third-year WMAP data constrains the likelihood function of non-flat ΛCDM models to a degeneracy line in the (ΩM, ΩV) plane. In this work, this data is used to find a fit for the late ISW constraint on dark energy for the coordinate along the CMB geometric degeneracy. The fit is extended to w ≠ -1 models and combined with data from supernovae, large scale structure, and baryon acoustic oscillations to fit for the dark energy equation of state. The late ISW effect gives a weak constraint for models along the degeneracy, and the resulting likelihood function is consistent with the observational data. The combined constraints yield roughly w = -1. This research was funded by the NSF Research Experiences for Undergraduates Program.

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