Cosmological Constraints on the Sign-Changeable Interactions

• 作者: 韦浩
• 来源期刊: 理论物理通讯：英文版
• 学科: 地球科学
• 关键词: 相互作用 宇宙 登录 观测数据 模型参数 关键参数 物理学 t方法
• 年，卷（期）: 2011,（11）
• 页码范围: 972-980
• 页数: 9页
• 分类号: P159|TP316.7
• 语种: 英文

摘要

Recently, Cai and Su [Phys. Rev. D 81 （2010） 103514] found that the sign of interaction Q in＇the dark sector changed in the approximate redshift range of 0.45 ≤ z ≤0.9, by using a modeMndependent method to deal with the observational data. In fact, this result raises a remarkable problem, since most of the familiar interactions cannot change their signs in the whole cosmic history. Motivated by the work of Cai and Su, we have proposed a new type of interaction in a previous work [H. Wei, Nucl. Phys. B 845 （2011） 381]. The key ingredient is the deceleration parameter q in the interaction Q, and hence the interaction Q can change its sign when our universe changes from deceleration （q 〉0） to acceleration （q 〈 0）. In the present work, we consider the cosmologicai constraints on this new type of sign-changeable interactions, by using the latest observational data. We find that the cosmological constraints on the model parameters are fairly tight. In particular, the key parameter β can be constrained to a narrow range.

作者信息

序号	姓名	单位	发文数	被引次数	H指数	G指数
1	韦浩		1	0	0.0	0.0