Chiral Primordial Gravitational Waves from a Lifshitz Point
Tomohiro TakahashiDepartment of Physics, Kyoto University, Kyoto, 606-8501, JapanJiro SodaDepartment of Physics, Kyoto University, Kyoto, 606-8501, Japan
2009en
ABI
Abstract
We study primordial gravitational waves produced during inflation in quantum gravity at a Lifshitz point proposed by Horava. Assuming power-counting renormalizability, foliation-preserving diffeomorphism invariance, and the condition of detailed balance, we show that primordial gravitational waves are circularly polarized due to parity violation. The chirality of primordial gravitational waves is a quite robust prediction of quantum gravity at a Lifshitz point which can be tested through observations of cosmic microwave background radiation and stochastic gravitational waves.
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