Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2003-05-27
Phys.Rev.D70:064039,2004
Physics
High Energy Physics
High Energy Physics - Theory
1+15 pages, no figure, Version to appear in PRD
Scientific paper
10.1103/PhysRevD.70.064039
We show that a self-tuning mechanism of the cosmological constant could work in 5D non-compact space-time with a $Z_2$ symmetry in the presence of a massless scalar field. The standard model matter fields live only on the 4D brane. The change of vacuum energy on the brane (brane cosmological constant) by, for instance, electroweak and QCD phase transitions, just gives rise to dynamical shifts of the profiles of the background metric and the scalar field in the extra dimension, keeping 4D space-time flat without any fine-tuning. To avoid naked singularities in the bulk, the brane cosmological constant should be negative. We introduce an additional brane-localized 4D Einstein-Hilbert term so as to provide the observed 4D gravity with the non-compact extra dimension. With a general form of brane-localized gravity term allowed by the symmetries, the low energy Einstein gravity is successfully reproduced on the brane at long distances. We show this phenomenon explicitly for the case of vanishing bulk cosmological constant.
Kim Jihn E.
Kyae Bumseok
Shafi Qaisar
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