A no-go for no-go theorems prohibiting cosmic acceleration in extra dimensional models
arXiv:1110.1492 · doi:10.1088/1475-7516/2011/12/015
Abstract
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.
20 pages
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