Comment on: Detecting Vanishing Dimensions Via Primordial Gravitational Wave Astronomy

Details Comment on: Detecting Vanishing Dimensions Via Primordial Gravitational Wave Astronomy Comment on: Detecting Vanishing Dimensions Via Primordial Gravitational Wave Astronomy

2011-04-07

arxiv.org/abs/1104.1223v1

Physical Review Letters 107 (2011) 169001

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

1 page, comment to Phys. Rev. Lett. 106, 101101 (2011) [arXiv:1102.3434]

Scientific paper

10.1103/PhysRevLett.107.169001

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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