A no-go for no-go theorems prohibiting cosmic acceleration in extra dimensional models

Details A no-go for no-go theorems prohibiting cosmic acceleration in extra dimensional models A no-go for no-go theorems prohibiting cosmic acceleration in extra dimensional models

2011-10-07

arxiv.org/abs/1110.1492v2

Physics

High Energy Physics

High Energy Physics - Theory

20 pages

Scientific paper

A four-dimensional effective theory that arises as the low-energy limit of some extra-dimensional model is constrained by the higher dimensional Einstein equations. Steinhardt & Wesley use this to show that accelerated expansion in our four large dimensions can only be transient in a large class of Kaluza-Klein models that satisfy the (higher dimensional) null energy condition [1]. We point out that these no-go theorems are based on a rather ad-hoc assumption on the metric, without which no strong statements can be made.

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