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Title: Detection of relic gravitational waves in the CMB: Prospects for CMBPol mission
Authors: Wen Zhao

Detection of relic gravitational waves, through their imprint in the cosmic microwave background radiation, is one of the most important tasks for the planned CMBPol mission. In the simplest viable theoretical models the gravitational wave background is characterized by two parameters, the tensor-to-scalar ratio r and the tensor spectral index n_t. In this paper, we analyse the potential joint constraints on these two parameters, r and n_t, using the potential observations of the CMBPol mission, which is expected to detect the relic gravitational waves if r\gtrsim0.001. The influence of the contaminations, including cosmic weak lensing, various foreground emissions, and systematical errors, is discussed.

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Measurement of the polarisation of the Cosmic Microwave Background (CMB) has the potential to provide one of the few quantitative observable consequences of the inflationary epoch. A community-wide study of the theory, analysis, instrumentation and technology is being supported by a NASA Mission Concept Study grant. This study will culminate in a report to NASA and to the 2010 NRC Decadal Survey Committee on Astrophysics with recommendations for the most expeditious path to realising that potential.
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