2007

Probing polarization states of primordial gravitational waves with CMB anisotropies

Saito, Shun, Ichiki, Kiyotomo, Taruya, Atsushi

Understand

We discuss the polarization signature of primordial gravitational waves imprinted in cosmic microwave background (CMB) anisotropies.

The high-energy physics motivated by superstring theory or M-theory generically yield parity violating terms, which may produce a circularly polarized gravitational wave background (GWB) during inflation.
In contrast to the standard prediction of inflation with un-polarized GWB, circularly polarized GWB generates non-vanishing TB and EB-mode power spectra of CMB anisotropies.
We evaluate the TB and EB-mode power spectra taking into account the secondary effects and investigate the dependence of cosmological parameters.

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