Fermi (GLAST) almost kills all Lorentz violating theories.

[MTd2]

It could be well be that the relation is almost a Heaviside function! :)

 

[dmtr]

Here is a link to a post by marcus made before the GLAST launch: https://www.physicsforums.com/showthread.php?t=177245 ...seems to be pretty consistent...

 

[MTd2]

http://arxiv.org/abs/1006.2126

Taming nonlocality in theories with deformed Poincare symmetry

Giovanni Amelino-Camelia, Marco Matassa, Flavio Mercati, Giacomo Rosati
(Submitted on 10 Jun 2010)
We here advocate a perspective on recent research investigating possible Planck-scale deformations of relativistic symmetries, which is centered on Einstein's characterization of spacetime points, given exclusively in terms of physical events. We provide the first ever explicit construction of worldlines governed by a Planck-scale deformation of Poincar\'e symmetry. And we show that the emerging physical picture allows a description that is faithful to Einstein's program, but forces the renunciation of the idealization of the coincidence of events. We use this to expose the limitations of the pre-Einsteinian description of spacetime points adopted in some recent related studies. In particular we find that the estimate of nonlocal effects reported in the recent Physical Review Letters 104, 140402 (2010) is incorrect by 29 orders of magnitude.*****

Bee wrong by 29 orders of magnitude.