The Cosmological Signatures and Flux Distribution of Gamma-Ray Bursts with a Broad Luminosity Distribution

摘要

Cosmological expansion cannot produce the reported correlations of the gamma-ray burst timescale and spectral energy with peak flux if the burst model reproduces the Burst and Transient Source Experiment (BATSE) 3B peak flux distribution for a nonevolving burst source density. The required ratios of time dilation and redshift factors are only produced by monoluminous models at peak fluxes below the BATSE threshold, and they are never produced by power-law luminosity models. Monoluminous models produce acceptable fits to the peak flux distribution only for very specific combinations of the spectral and cosmological parameters.