Anzhong Wang, Qiang Wu, Wen Zhao, Tao Zhu
We study primordial gravitational waves (PGWs) in the Horava-Lifshitz (HL) theory of quantum gravity, in which high-order spatial derivative terms, including the ones violating parity, generically appear in order to be UV complete. Because of the parity violation and non-adiabatic evolution, a large polarization of PGWs becomes possible, and it could be well within the range of detection for the forthcoming cosmic microwave background (CMB) observations.
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http://arxiv.org/abs/1208.5490
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