In Hořava-Lifshitz gravity, primordial gravitational waves can be generated without inflation and their nonclassical statistics might be detectable by HBT interferometry above about 10 kHz in the radiation era or 10^-3 Hz in the matter era.
Gravitational Wave Spectrum in Inflation with Nonclassical States
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abstract
The initial quantum state during inflation may evolve to a highly squeezed quantum state due to the amplification of the time-dependent parameter, $\omega_{phys}(k/a)$, which may be the modified dispersion relation in trans-Planckian physics. This squeezed quantum state is a nonclassical state that has no counterpart in the classical theory. We have considered the nonclassical states such as squeezed, squeezed coherent, and squeezed thermal states, and calculated the power spectrum of the gravitational wave perturbation when the mode leaves the horizon.
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HBT Interferometry and Quantum Nature of Primordial Gravitational Waves in Ho\v{r}ava-Lifshitz Gravity
In Hořava-Lifshitz gravity, primordial gravitational waves can be generated without inflation and their nonclassical statistics might be detectable by HBT interferometry above about 10 kHz in the radiation era or 10^-3 Hz in the matter era.