Chiral primordial gravitational waves from a Lifshitz point
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 a...
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| Published in | Physical review letters Vol. 102; no. 23; p. 231301 |
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| Main Authors | , |
| Format | Journal Article |
| Language | English |
| Published |
United States
12.06.2009
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| Online Access | Get more information |
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| Summary: | 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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| ISSN: | 0031-9007 |
| DOI: | 10.1103/physrevlett.102.231301 |