Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2007-10-15
JCAP 0712:006,2007
Physics
High Energy Physics
High Energy Physics - Theory
12 pages, 1 figure
Scientific paper
10.1088/1475-7516/2007/12/006
We derive the low energy effective theory on a brane in six-dimensional chiral supergravity. The conical 3-brane singularities are resolved by introducing cylindrical codimension one 4-branes whose interiors are capped by a regular spacetime. The effective theory is described by the Brans-Dicke (BD) theory with the BD parameter given by $\omega_{\rm BD}=1/2$. The BD field is originated from a modulus which is associated with the scaling symmetry of the system. If the dilaton potentials on the branes preserve the scaling symmetry, the scalar field has an exponential potential in the Einstein frame. We show that the time dependent solutions driven by the modulus in the four-dimensional effective theory can be lifted up to the six-dimensional exact solutions found in the literature. Based on the effective theory, we discuss a possible way to stabilize the modulus to recover standard cosmology and also study the implication for the cosmological constant problem.
Arroja Frederico
Kobayashi Tsutomu
Koyama Kazuya
Shiromizu Tetsuya
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