No Evidence of Time Dilation in Gamma-Ray Burst Data

Understand

Gamma-Ray Bursts have been observed out to very high redshifts and provide time measures that are directly related to intrinsic time scales of the burst.

• Einstein's theory of relativity is quite definite that if the universe is expanding then the observed duration of these measures will increase with redshift.
• Thus gamma-ray burst measures should show a time dilation proportional to redshift.
• An analysis of gamma-ray burst data shows that the hypothesis of time dilation is rejected with a probability of 4.4$\times10^{-6}$ for redshifts out to z=6.6.