Dark energy and cosmic microwave background bispectrum

Details Dark energy and cosmic microwave background bispectrum Dark energy and cosmic microwave background bispectrum

2001-08-10

arxiv.org/abs/astro-ph/0108179v2

Phys.Rev. D65 (2002) 043007

Astronomy and Astrophysics

Astrophysics

To appear in PRD, 6 pages, 3 figures, minor changes to match the accepted version

Scientific paper

10.1103/PhysRevD.65.043007

We compute the cosmic microwave background bispectrum arising from the cross-correlation of primordial, lensing and Rees-Sciama signals. The amplitude of the bispectrum signal is sensitive to the matter density parameter, Omega_0, and the equation of state of the dark energy, which we parameterize by w_Q. We conclude that the dataset of the Atacama Cosmology Telescope, combined with MAP 2-year data or the Planck data set alone will allow us to break the degeneracy between Omega_0 and w_Q that arises from the analysis of CMB power spectrum. In particular a joint measurement of Omega_0 and w_Q with 10% and 30% error on the two parameters respectively, at the 90% confidence level can realistically be achieved.

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