Improved Dark Energy Detection through the Polarization-assisted WMAP-NVSS ISW Correlation - Astrophysics > Cosmology and Nongalactic AstrophysicsReportar como inadecuado




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Abstract: Integrated Sachs-Wolfe ISW effect can be estimated by cross-correlatingCosmic Microwave Background CMB sky with tracers of the local matterdistribution. At late cosmic time, the dark energy induced decay of gravitationpotential generates a cross-correlation signal on large angular scales. Thedominant noise are the intrinsic CMB anisotropies from the inflationary epoch.In this Letter we use CMB polarization to reduce this intrinsic noise. Wecross-correlate the microwave sky observed by Wilkinson Microwave AnisotropyProbe WMAP with the radio source catalog compiled by NRAO VLA Sky SurveyNVSS to study the efficiency of the noise suppression . We find that theerror bars are reduced about 5-12 %, improving the statistical power.



Autor: Guo-Chin Liu, Kin-Wang Ng, Ue-Li Pen

Fuente: https://arxiv.org/







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