Gamma-Ray Bursts in $1.8<z<5.6$ Suggest that the Time Variation of the Dark Energy is Small

Yoshiki Kodama, Daisuke Yonetoku, Toshio Murakami +3

We calibrated the peak energy-peak luminosity relation of GRBs (so called Yonetoku relation) using 33 events with the redshift $z<1.62$ without assuming any cosmological models.…