Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2004-06-02
Phys.Lett. B600 (2004) 133-141
Physics
High Energy Physics
High Energy Physics - Theory
14 pages, 1 fig. As appeared in Phys. lett. B
Scientific paper
10.1016/j.physletb.2004.08.067
We propose a partial solution to the cosmological constant problem by using the simple observation that a three-brane in a six-dimensional bulk is flat. A model is presented in which Standard Model vacuum energy is always absorbed by the transverse space. The latter is a tear-drop like space with a conical singularity, which preserves bulk supersymmetry and gives rise to conventional macroscopic 4D gravity with no cosmological constant. Its cone acts like a drain, depleting vacuum energy from the three-brane to the tear drop increasing its volume. We stress that although gravity is treated classically, Standard Model is handled quantum-field theoretically and the model is robust against Standard Model corrections and particular details. The price paid is the presence of boundaries which are nevertheless physically harmless by appropriate boundary conditions.
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