Is the thick brane model consistent with recent observations

摘要: There exist many observational evidences implying the expansion of our Universe is undergoing a late-time acceleration; mechanism this acceleration yet unknown. In so-called thick brane model phenomena attributed to thickness along extra dimension. study we mainly rely on consistency with most recent data related background evolution. The new Supernova Type Ia (SNIa) Gold sample and Legacy Survey (SNLS) data, position acoustic peak at last scattering surface from Wilkinson Microwave Anisotropy Probe (WMAP) observations baryon oscillation found in Sloan Digital Sky (SDSS) are used constrain free parameter codimension 1 model. To infer its age Universe, compare old cosmological objects what computed using best-fit values for parameters. When matter dominated, $w=0$, 68% level confidence, combination SNIa, cosmic microwave (CMB) shift SDSS databases provide ${\ensuremath{\Omega}}_{m}={0.31}_{\ensuremath{-}0.02}^{+0.02}$, ${\ensuremath{\Omega}}_{\mathcal{C}}={0.05}_{\ensuremath{-}0.01}^{+0.01}$, ${w}_{r}=\ensuremath{-}{1.40}_{\ensuremath{-}0.20}^{+0.20}$, hence spatially open universe ${\ensuremath{\Omega}}_{k}={0.21}_{\ensuremath{-}0.08}^{+0.08}$. same SNLS supernova observation gives ${\ensuremath{\Omega}}_{m}={0.28}_{\ensuremath{-}0.02}^{+0.03}$, ${\ensuremath{\Omega}}_{\mathcal{C}}={0.037}_{\ensuremath{-}0.004}^{+0.003}$, ${w}_{r}=\ensuremath{-}{2.05}_{\ensuremath{-}0.15}^{+0.15}$ consequently provides ${\ensuremath{\Omega}}_{k}={0.11}_{\ensuremath{-}0.07}^{+0.10}$. These results obviously seem be contradiction WMAP indicating flat universe.