Fine tuning problem of the cosmological constant in a generalized Randall-Sundrum model

doi:10.1088/1674-1137/abb4cd

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	Fine tuning problem of the cosmological constant in a generalized Randall-Sundrum model
	Kang, Guang-Zhen ; Zhang, De-Sheng ; Jun, Li ; Zong, Hong-Shi
刊名	CHINESE PHYSICS C
	2020
卷号	44 期号:12 页码:125102
关键词	QUANTUM-THEORY DARK ENERGY CONSTRAINTS DIMENSIONS HIERARCHY
ISSN号	1674-1137
DOI	10.1088/1674-1137/abb4cd
英文摘要	To solve the cosmological constant fine tuning problem, we investigate an (n+1)-dimensional generalized Randall-Sundrum brane world scenario with two (n-1)-branes instead of two 3-branes. Adopting an anisotropic metric ansatz, we obtain the positive effective cosmological constant Omega(eff) of order 10(-124) and only require a solution similar or equal to 50-50. Meanwhile, both the visible and hidden branes are stable because their tensions are positive. Therefore, the fine tuning problem can be solved quite well. Furthermore, the Hubble parameter H-1(z) as a function of redshift is in good agreement with the cosmic chronometers dataset. The evolution of the universe naturally shifts from deceleration to acceleration. This suggests that the evolution of the universe is intrinsically an extra-dimensional phenomenon. It can be regarded as a dynamic model of dark energy that is driven by the evolution of the extra dimensions on the brane.
学科主题	Physics
语种	英语
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/27324]
专题	理论物理研究所_理论物理所1978-2010年知识产出
作者单位	1.Yangzhou Polytech Inst, Sch Sci, Yangzhou 225127, Jiangsu, Peoples R China 2.[Kang, Guang-Zhen 3.Jun, Li 4.Nanjing Univ, Dept Phys, Nanjing 210093, Peoples R China 5.Changzhou Inst Technol, Sch Sci, Changzhou 213032, Jiangsu, Peoples R China 6.Joint Ctr Particle Nucl Phys & Cosmol, Nanjing 210093, Peoples R China 7.Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Kang, Guang-Zhen,Zhang, De-Sheng,Jun, Li,et al. Fine tuning problem of the cosmological constant in a generalized Randall-Sundrum model[J]. CHINESE PHYSICS C,2020,44(12):125102.
APA	Kang, Guang-Zhen,Zhang, De-Sheng,Jun, Li,&Zong, Hong-Shi.(2020).Fine tuning problem of the cosmological constant in a generalized Randall-Sundrum model.CHINESE PHYSICS C,44(12),125102.
MLA	Kang, Guang-Zhen,et al."Fine tuning problem of the cosmological constant in a generalized Randall-Sundrum model".CHINESE PHYSICS C 44.12(2020):125102.