Vacuum Birefringence as a Probe of Planck Scale Noncommutativity

Details Vacuum Birefringence as a Probe of Planck Scale Noncommutativity Vacuum Birefringence as a Probe of Planck Scale Noncommutativity

2006-07-17

arxiv.org/abs/hep-ph/0607188v1

JHEP 0609 (2006) 074

Physics

High Energy Physics

High Energy Physics - Phenomenology

19 pages, 4 figures, 1 table

Scientific paper

10.1088/1126-6708/2006/09/074

Because of ultraviolet/infrared (UV/IR) mixing, the low energy physics of noncommutative gauge theories in the Moyal-Weyl approach seems to depend crucially on the details of the ultraviolet completion. However, motivated by recent string theory analyses, we argue that their phenomenology with a very general class of UV completions can be accurately modelled by a cutoff close to the Planck scale. In the infrared the theory tends continuously to the commutative gauge theory. If the photon contains contributions from a trace-U(1), we would observe vacuum birefringence, i.e. a polarisation dependent propagation speed, as a residual effect of the noncommutativity. Constraints on this effect require the noncommutativity scale to be close to the Planck scale.

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