Detecting Vanishing Dimensions Via Primordial Gravitational Wave Astronomy

Details Detecting Vanishing Dimensions Via Primordial Gravitational Wave Astronomy Detecting Vanishing Dimensions Via Primordial Gravitational Wave Astronomy

2011-02-16

arxiv.org/abs/1102.3434v2

Phys.Rev.Lett.106:101101,2011

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Somewhat expanded version with discussions that could not fit into the PRL version; references added

Scientific paper

10.1103/PhysRevLett.106.101101

Lower-dimensionality at higher energies has manifold theoretical advantages as recently pointed out. Moreover, it appears that experimental evidence may already exists for it - a statistically significant planar alignment of events with energies higher than TeV has been observed in some earlier cosmic ray experiments. We propose a robust and independent test for this new paradigm. Since (2+1)-dimensional spacetimes have no gravitational degrees of freedom, gravity waves cannot be produced in that epoch. This places a universal maximum frequency at which primordial waves can propagate, marked by the transition between dimensions. We show that this cut-off frequency may be accessible to future gravitational wave detectors such as LISA.

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