Le contenu de cette page n’est pas disponible en français. Veuillez nous en excuser.

Astrophysical Searches for Quantum Gravity Signals

Playing this video requires the latest flash player from Adobe.

Download link (right click and 'save-as') for playing in VLC or other compatible player.

Recording Details

Scientific Areas: 
PIRSA Number: 


Some recent searches for quantum gravity signatures using
observations of distant astrophysical sources will be discussed, focusing on
the search for Lorentz invariance violation (LIV) in the form of a dependence
of the photon propagation speed on its energy. Fermi gamma-ray space telescope
observations of ~8 keV to ~30 GeV photons from a short ( burst (GRB 090510) at a cosmological distance (z = 0.903), enabled for the
first time to put a direct time of flight limit on a possible linear variation of
the speed of light with photon energy that is beyond the Planck scale.

|v/c-1| = E/E_{QG} our most conservative limits are

> 1.2, while less conservative limits are up to 1-2
orders of

magnitude stricter. Other types of astrophysical searches
for LIV will be briefly outlined, along with some prospects for the future.