2011

Gauss-Bonnet as effective cosmological constant

Zhao, Liu, Meng, Kun

Understand

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.

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