Tunneling into Extra Dimension and High-Energy Violation of Lorentz Invariance

Details Tunneling into Extra Dimension and High-Energy Violation of Lorentz Invariance Tunneling into Extra Dimension and High-Energy Violation of Lorentz Invariance

2001-03-23

arxiv.org/abs/hep-th/0103205v2

JHEP 0201 (2002) 012

Physics

High Energy Physics

High Energy Physics - Theory

21 pages, references and comments added, final version to appear in JHEP

Scientific paper

10.1088/1126-6708/2002/01/012

We consider a class of models with infinite extra dimension, where bulk space does not possess SO(1,3) invariance, but Lorentz invariance emerges as an approximate symmetry of the low-energy effective theory. In these models, the maximum attainable speeds of the graviton, gauge bosons and scalar particles are automatically equal to each other and smaller than the maximum speed in the bulk. Additional fine-tuning is needed in order to assure that the maximum attainable speed of fermions takes the same value. A peculiar feature of our scenario is that there are no truly localized modes. All four-dimensional particles are resonances with finite widths. The latter depends on the energy of the particle and is naturally small at low energies.

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