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• W3103575287 abstract "Gamma-ray bursts (GRBs) are attractive objects for constraining the nature of dark energy in a way complementary to other cosmological probes, especially at high redshifts. However, the apparent magnitude of distant GRBs can be distorted by the gravitational lensing from the density fluctuations along the line of sight. We investigate the gravitational lensing effect on the cosmological parameters and dark energy equation of state from GRBs. We first calibrated the GRB luminosity relations without assuming any cosmological models. The luminosity distances of low-redshift GRBs were calibrated with the cosmography method using a latest type Ia supernova (SNe Ia) sample. We find that the gravitational lensing has non-negligible effects on the determination of cosmological parameters and dark energy. The gravitational lensing shifts the best-fit constraints on cosmological parameters and dark energy. Because high-redshift GRBs are more likely to be reduced, the most probable value of the observed matter density $Omega_M$ is slightly lower than its actual value. In the $Lambda$CDM model, we find that the matter density parameter $Omega_M$ will shift from 0.30 to 0.26 after including the gravitational lensing effect. The gravitational lensing also affects the dark energy equation of state by shifting it to a more negative value. We constrain the dark energy equation of state out to redshift $zsim 8$ using GRBs for the first time, and find that the equation of state deviates from $Lambda$CDM at the $1sigma$ confidence level, but agrees with $w=-1$ at the $2sigma$ confidence level." @default.
• W3103575287 created "2020-11-23" @default.
• W3103575287 creator A5069594358 @default.
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• W3103575287 date "2011-12-01" @default.
• W3103575287 modified "2023-10-10" @default.
• W3103575287 title "Weak gravitational lensing effects on cosmological parameters and dark energy from gamma-ray bursts" @default.
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• W3103575287 doi "https://doi.org/10.1051/0004-6361/201117517" @default.
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