The Shape of gravity
Aug, 19998 pages
Published in:
- JHEP 06 (2000) 014
e-Print:
- hep-th/9908076 [hep-th]
Report number:
- MIT-CTP-2892,
- PUPT-1883,
- NSF-ITP-99-092,
- FERMILAB-PUB-00-267-T
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Abstract:
In a nontrivial background geometry with extra dimensions, gravitational effects will depend on the shape of the Kaluza-Klein excitations of the graviton. We investigate a consistent scenario of this type with two positive tension three-branes separated in a five-dimensional Anti-de Sitter geometry. The graviton is localized on the ``Planck'' brane, while a gapless continuum of additional gravity eigenmodes probe the {\it infinitely} large fifth dimension. Despite the background five-dimensional geometry, an observer confined to either brane sees gravity as essentially four-dimensional up to a position-dependent strong coupling scale, no matter where the brane is located. We apply this scenario to generate the TeV scale as a hierarchically suppressed mass scale. Arbitrarily light gravitational modes appear in this scenario, but with suppressed couplings. Real emission of these modes is observable at future colliders; the effects are similar to those produced by {\it six} large toroidal dimensions.- Kaluza-Klein model
- dimension: >4
- gravitation: fluctuation
- membrane model
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