Abstract
We show that if the gravitational Chern-Simons term couples to a massive scalar field (m > H), the primordial gravitational waves (GWs) will show itself the chirality oscillation, i.e., the amplitudes of the left- and right-handed GWs modes will convert into each other and oscillate in their propagations. This oscillation will eventually develop a permanent difference of the amplitudes of both modes, which leads to nearly opposite oscillating shapes in the power spectra of the left- and right-handed primordial GWs. We discuss its implication to the CMB B-mode polarization.
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ArXiv ePrint: 1608.06508
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Cai, Y., Wang, YT. & Piao, YS. Chirality oscillation of primordial gravitational waves during inflation. J. High Energ. Phys. 2017, 24 (2017). https://doi.org/10.1007/JHEP03(2017)024
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DOI: https://doi.org/10.1007/JHEP03(2017)024