Evolving dark energy from GRBs
Posted: January 12 2006
Is anybody at the AAS meeting and saw the talk by Bradley Schaefer, which claims to have detected evolution in the dark energy using Gamma Ray Bursts as standard candles? There is a webpage with the abstract and some plots here www.phys.lsu.edu/GRBHD.
What do people think about his claim? It is only 2.5 sigma, so it is not conlcusive. They plot w0 against w'(=dw/dz), but will that parameterisation work at redshifts up to z~6? And what about other effects? Like SN-Ia, the mechanism for GRBs is unknown, so we don't know what kind of evolutions could take place between redshift 6 and 0.
What do people think about his claim? It is only 2.5 sigma, so it is not conlcusive. They plot w0 against w'(=dw/dz), but will that parameterisation work at redshifts up to z~6? And what about other effects? Like SN-Ia, the mechanism for GRBs is unknown, so we don't know what kind of evolutions could take place between redshift 6 and 0.