Journal
PHYSICAL REVIEW D
Volume 88, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.88.063508
Keywords
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Funding
- DOE [DE-FG02-10ER41692]
- NSFC [11205133, 11047008, 11105120, 11173021, 11075141, 11375153, 11322324]
- Ciencia Sem Fronteiras [004/2013-DRI/CAPES]
- Knowledge Innovation Program of Chinese Academy of Science
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In this paper, we study the effects of parity violation on non-Gaussianities of primordial gravitational waves in the framework of the Horava-Lifshitz theory of gravity, in which high-order spatial derivative operators, including the ones violating parity, generically appear. By calculating the three-point function, we find that the leading-order contributions to the non-Gaussianities come from the usual second-order derivative terms, which produce the same bispectrum as that found in general relativity. The contributions from high-order spatial nth derivative terms are always suppressed by a factor (H/M-*)(n-2)(n >= 3), where H denotes the inflationary energy and M-* the suppression mass scale of the high-order spatial derivative operators of the theory. Therefore, the next leading-order contributions come from the three-dimensional gravitational Chern-Simons term. With some reasonable arguments, it is shown that this three-dimensional operator is the only one that violates the parity and in the meantime has nonvanishing contributions to non-Gaussianities.
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