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Comment on: Detecting Vanishing Dimensions Via Primordial Gravitational Wave Astronomy

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arxiv 1104.1223 v1 pith:IL4AWO4N submitted 2011-04-07 gr-qc hep-th

classification gr-qchep-th
keywords gravitationaldimensionsmodelsprimordialwavearguearxivastronomy
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It has been recently claimed [arXiv:1102.3434] that quantum gravity models where the number of dimensions reduces at the ultraviolet exhibit a potentially observable cutoff in the primordial gravitational wave spectrum, and that this is a "generic" and "robust" test for such models, since "(2+1)-dimensional spacetimes have no gravitational degrees of freedom". We argue that such a claim is misleading.

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