The largest structure of the Universe defined by Gamma-Ray Bursts

Author: Istvan Horvath

Abstract: Research over the past three decades has revolutionarized the field of cosmology. The cosmological standard model seems to be working well. However, the cosmological principle of homogeneity and isotropy of the Universe was doubted since structures as large as the survey size were always found as the survey size was increased in observational cosmology. Until now the biggest known structure of our Universe is the Sloan Great Wall, which more than 400 Mpc long and located approximately one billion light-years away.

We report the discovery an at least seven times bigger structure suggested by the Gamma-Ray Bursts observations. Gamma-Ray Bursts are very good indicators for dens part of the Universe for normal matter. Till November 2012 there have been 283 GRBs’ redshift observed. If one cut them in distance to several part and compare the sky distribution of these subsamples (each contains same GRBs’ position in the sky) one can observe that one subsample differs significantly from the others. Using the two-dimensional Kolmogorov-Smirnov test the significance of this observation is less than 0.05 per cent. The binomial probability to find such deviation is even smaller: p=0,0000055.

The size of this structure defined by these GRBs is more than 3000 Mpc, which is more than seven times the size of the lately known biggest object (SGW) is in the Universe.