Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2001-05-30
Gen.Rel.Grav.33:1921-1928,2001
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
First Award in the 2001 Annual Essay Competition of the Gravity Research Foundation
Scientific paper
10.1023/A:1013094709013
Brane worlds are theories with extra spatial dimensions in which ordinary matter is localized on a (3+1) dimensional submanifold. Such theories could have interesting consequences for particle physics and gravitational physics. In this essay we concentrate on the cosmological constant (CC) problem in the context of brane worlds. We show how extra-dimensional scenarios may violate Lorentz invariance in the gravity sector of the effective 4D theory, while particle physics remains unaffected. In such theories the usual no-go theorems for adjustment of the CC do not apply, and we indicate a possible explanation of the smallness of the CC. Lorentz violating effects would manifest themselves in gravitational waves travelling with a speed different from light, which can be searched for in gravitational wave experiments.
Csa'ki Csaba
Erlich Joshua
Grojean Christophe
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