Dark-energy constraints with ALMA polarization measurements

Details Dark-energy constraints with ALMA polarization measurements Dark-energy constraints with ALMA polarization measurements

2007-03-02

arxiv.org/abs/astro-ph/0703050v1

Astronomy and Astrophysics

Astrophysics

4 pages, Proceedings of Science with ALMA: a new era for Astrophysics: International Conference, 2006 held 13 - 17 November 20

Scientific paper

The Cosmic Microwave Background (CMB) physics can be used to constrain the dark energy dynamics: B modes of the polarization of the diffuse CMB emission as well as the polarized signal towards clusters of galaxies are sensitive to the Hubble expansion rate and thus the dark energy abundance in the early stage of cosmic acceleration. The first effect is sourced by gravitational lensing of large scale cosmic structures, the second is due to scattering of the primary CMB temperature anisotropy quadrupole by free electrons in cluster plasma. We are investigating the capabilities of ALMA to detect these effects and constrain the high-redshift dark energy abundance through measurements of sub-arcminute CMB anisotropies.

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