Dynamical instability of brane solutions with a self-tuning cosmological constant
| Autor: | Christophe Grojean, James M. Cline, Pierre Binetruy |
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| Rok vydání: | 2000 |
| Předmět: |
High Energy Physics - Theory
Physics Nuclear and High Energy Physics FOS: Physical sciences General Relativity and Quantum Cosmology (gr-qc) Cosmological constant General Relativity and Quantum Cosmology High Energy Physics - Phenomenology symbols.namesake High Energy Physics - Phenomenology (hep-ph) High Energy Physics - Theory (hep-th) Vacuum energy Saddle point symbols Boundary value problem Einstein Brane Scalar field Mathematical physics Cosmological constant problem |
| Zdroj: | Physics Letters B. 489:403-410 |
| ISSN: | 0370-2693 |
| Popis: | A five-dimensional solution to Einstein's equations coupled to a scalar field has been proposed as a partial solution to the cosmological constant problem: the effect of arbitrary vacuum energy (tension) of a 3-brane is cancelled; however, the scalar field becomes singular at some finite proper distance in the extra dimension. We show that in the original model with a vanishing bulk potential for the scalar, the solution is a saddle point which is unstable to expansion or contraction of the brane world. We construct exact time-dependent solutions which generalize the static solution, and demonstrate that they do not conserve energy on the brane; thus they do not have an effective 4-D field theoretic description. When a bulk scalar field potential is added, the boundary conditions on the brane cannot be trivially satisfied, raising hope that the self-tuning mechanism may still give some insight into the cosmological constant problem in this case. 11 pages, 2 figures |
| Databáze: | OpenAIRE |
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