We investigate observational constraints on the Dvali, Gabadadze and Porrati （DGP） model with Gamma-ray bursts （GRBs） at high redshift obtained directly from the Union2 Type Ia supernovae data set. With cosmology-...We investigate observational constraints on the Dvali, Gabadadze and Porrati （DGP） model with Gamma-ray bursts （GRBs） at high redshift obtained directly from the Union2 Type Ia supernovae data set. With cosmology-independent GRBs, the Union2 set, as well as the cosmic microwave background observation from the WMAP7 result, the baryon acoustic oscillation, the baryon mass fraction in clus- ters and the observed H（z） data, we obtain that the best-fit values of the DGP model are {ΩM0,Ωrc} = {0.235^＋0.015-0.14, 0.138^＋0.o51-0.048}, which favor a flat universe, and the transition redshift of the DGP model is ZT=0.67^＋0.03-0.04.These results lead to more stringent constraints than the previous results for the DGP model.展开更多
基金supported by the National Natural Science Foundation of China (Grant No. 10825313)the Key Project (Grant No. 10533010)the National Basic Science Program (Project 973,Grant No. 2007CB815401)
文摘We investigate observational constraints on the Dvali, Gabadadze and Porrati （DGP） model with Gamma-ray bursts （GRBs） at high redshift obtained directly from the Union2 Type Ia supernovae data set. With cosmology-independent GRBs, the Union2 set, as well as the cosmic microwave background observation from the WMAP7 result, the baryon acoustic oscillation, the baryon mass fraction in clus- ters and the observed H（z） data, we obtain that the best-fit values of the DGP model are {ΩM0,Ωrc} = {0.235^＋0.015-0.14, 0.138^＋0.o51-0.048}, which favor a flat universe, and the transition redshift of the DGP model is ZT=0.67^＋0.03-0.04.These results lead to more stringent constraints than the previous results for the DGP model.
