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Polarized CMB: Reionization and Primordial Tensor Modes

Published online by Cambridge University Press:  23 September 2016

Asantha Cooray
Asantha Cooray*
Affiliation:
Theoretical Astrophysics, California Institute of Technology, Pasadena, California 91125, USA. E-mail: asante@caltech.edu

Abstract

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We discuss upcoming opportunities with cosmic microwave background (CMB) observations during the post-WMAP era. The curl-modes of CMB polarization probe inflationary gravitational waves (IGWs). While a significant source of confusion is expected from cosmic shear conversion of polarization related to density perturbations, higher resolution observations of CMB anisotropies can be used for a lensing reconstruction and to separate gravitational-wave polarization signature from that of lensing. Separations based on current lensing reconstruction techniques allow the possibility to probe inflationary energy scales below 1015 GeV in a range that includes grand unified theories. The observational detection of primordial curl-modes is aided by rescattering at late times during the reionized epoch with optical depth to electron scattering at the level of 0.1 and above. An improved measurement of this optical depth is useful to optimize experimental parameters of a post-WMAP mission attempting to target the IGW background.

Type
Session I: Cosmic Microwave Background and Cosmology
Information
Symposium - International Astronomical Union , Volume 216: Maps of the Cosmos , 2005 , pp. 51 - 58
Copyright
Copyright © Astronomical Society of the Pacific 2005 

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