High-redshift star formation rate up to z~8.3 derived from gamma-ray bursts and influence of background cosmology
Abstract
The high-redshift star formation rate (SFR) is difficult to measure directly even by modern approaches. Long-duration gamma-ray bursts (GRBs) can be detected to the edge of the visible universe because of their high luminorsities. The collapsar model of long gamma-ray bursts indicates that they may trace the star formation history. So long gamma-ray bursts may be a useful tool of measuring the high-redshift SFR. Observations show that long gamma-ray bursts prefer to form in a low-metallicity environment. We study the high-redshift SFR up to z~8.3 considering the Swift GRBs tracing the star formation history and the cosmic metallicity evolution in different background cosmological models including , quintessence, quintessence with a time-varying equation of state, and brane-world model. We use latest Swift GRBs including two highest-z GRBs, GRB 080913 at z=6.7 and GRB 090423 at z=8.3. We find that the SFR at z>4 shows a steep decay with a slope of -5.0 in . In the other three models, the high-redshift SFR is slightly different from model, and also shows a steep decay.
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