On Hoava-Lifshitz cosmology |
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作者单位: | Department of Physics;and State Key Laboratory of Nuclear Physics and Technology;Peking University; |
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基金项目: | Supported by NSFC (10535060, 10775002, 10975005); RFDP |
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摘 要: | We give a brief overview of the Hoava-Lifshitz-gravity theory, its modifications and its implications in cosmology. In particular, we discuss the various issues on the gravitational scalar mode, including its decoupling, its role as inflaton and its stability. Our analysis shows that the scalar mode could decouple naturally at λ = 1 due to the extra gauge symmetry. On the other hand, the fact that the scalar mode becomes ghost when 1/3 < λ < 1 is a real challenge to the theory. We try to overcome this prob...
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关 键 词: | Hoava-Lifshitz-gravity cosmology ghost |
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