On Hoava-Lifshitz cosmology

作     者：CHEN Bin1) Department of Physics, and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China 

作者机构：Department of Physics and State Key Laboratory of Nuclear Physics and Technology Peking University 

出 版 物：《Chinese Physics C》 (中国物理C（英文版）)

年 卷 期：2011年第35卷第5期

页      面：429-435页

核心收录：

学科分类：07[理学] 08[工学] 070401[理学-天体物理] 0704[理学-天文学] 080101[工学-一般力学与力学基础] 0801[工学-力学（可授工学、理学学位）] 

基　　金：Supported by NSFC (10535060, 10775002, 10975005) RFDP 

主　　题：Horava-Lifshitz-gravity cosmology ghost 

摘      要：We give a brief overview of the Horava-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 problem by modifying the action such that the RG flow lies outside the problematic region. We discuss the cosmological implications of the theory.