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Gauss-Bonnet as Effective Cosmological Constant

Gauss-Bonnet as Effective Cosmological Constant
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摘要 It is known that Gauss-Bonnet terms in higher dimensional gravity can produce an effective cosmological constant.We add extra examples to this picture by presenting explicitly two branches of accelerating vacuum solutions to the Einstein-Gauss-Bonnet gravities with a bare cosmological constant in 5 and 6 dimensions.Both branches of solutions are of constant curvature and the effective cosmological constants are independent of the acceleration parameter.One branch(the "-" branch) of the solutions is well defined in the limit when the Gauss-Bonnet parameter approaches zero,in which case the effective cosmological constant becomes identical with the bare value,while the other(i.e.the "+") branch is singular in the same limit,and beyond this singular limit,the effective cosmological constant is inversely proportional to the Gauss-Bonnet parameter with a negative constant of proportionality when the bare value vanishes.
作者 赵柳 孟坤
机构地区 School of Physics
出处 《Communications in Theoretical Physics》 SCIE CAS CSCD 2012年第4期607-610,共4页 理论物理通讯(英文版)
基金 Supported by the National Natural Science Foundation of China under Grant No. 10875059 the Special Fund for Theoretical Physics from the National Natural Science Foundation of China under Grant No. 10947203
关键词 proper acceleration Gauss-Bonnet VACUUM 宇宙常数 高斯 爱因斯坦 速度参数 真空解 常曲率 内参数 比重
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