Can we have a stringy origin behind $Ω_Λ(t)\propto Ω_m(t)$?

Details Can we have a stringy origin behind $Ω_Λ(t)\propto Ω_m(t)$? Can we have a stringy origin behind $Ω_Λ(t)\propto Ω_m(t)$?

2004-08-03

arxiv.org/abs/hep-th/0408026v2

Physics

High Energy Physics

High Energy Physics - Theory

4 pages, discussions added on recent acceleration, typos corrected, references added

Scientific paper

Inspired by the current observations that the ratio of the abundance of dark energy $\Omega_{\Lambda}$, and the matter density, $\Omega_{m}$, is such that $\Omega_{m}/\Omega_{\Lambda}\sim 0.37$, we provide a string inspired phenomenological model where we explain this order one ratio, the smallness of the cosmological constant, and also the recent cosmic acceleration. We observe that any effective theory motivated by a higher dimensional physics provides radion/dilaton couplings to the standard model and the dark matter component with different strengths. Provided radion/dilaton is a dynamical field we show that $\Omega_{\Lambda}(t)$ tracks $\Omega_{m}(t)$ and dominates very recently.

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