Constraints on the Dvali‐Gabadadze‐Porrati Model from Recent Supernova Observations and Baryon Acoustic Oscillations

Although there is mounting observational evidence that the expansion of ouruniverse is undergoing a late-time acceleration, the mechanism for thisacceleration is yet unknown. In the so-called Dvali-Gabadadze-Porrati (DGP)model this phenomena is attributed to gravitational leakage into extradimensions. In this work, we mainly focus our attention to the constraints onthe model from the gold sample of type Ia supernovae (SNeIa), the first yeardata from the Supernova Legacy Survey (SNLS) and the baryon acousticoscillation (BAO) peak found in the Sloan Digital Sky Survey (SDSS). At 99.73%confidence level, the combination of the three databases providesOmega_m=0.270^{+0.018}_{-0.017} and Omega_{r_c}=0.216^{+0.012}_{-0.013} (hencea spatially closed universe with Omega_k=-0.350^{+0.080}_{-0.083}), which seemsto be in contradiction with the most recent WMAP results indicating a flatuniverse. Based on this result, we also estimated the transition redshift (atwhich the universe switches from deceleration to acceleration) to be 0.70

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