Scale invariant power spectrum in Hořava-Lifshitz cosmology without matter
Bin Chen; Shi Pi; Jin-Zhang Tang; Bin Chen; Department of Physics, and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China; Shi Pi; Department of Physics, and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China; Jin-Zhang Tang; Department of Physics, and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
Журнал:
Journal of Cosmology and Astroparticle Physics
Дата:
2009-08-01
Аннотация:
In this paper we investigate the physical implications of the dynamical scalar mode in pure Hořava-Lifshitz gravity on cosmology. We find that it can produce a scale-invariant power spectrum in UV era if the detailed balance condition on the action is relaxed. This indicates that the physical scalar mode may seed the large scale structure and Hořava-Lifshitz cosmology could be a qualified alternative to inflationary scenario.
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