We show that existing low energy experiments , searching for the breaking of local Lorentz invariance , set bounds upon string theory inspired quantum gravity models that induce corrections to the propagation of fields .
Using the standard Observer Lorentz transformations in the D-particle recoil model we find M \geq 1.2 \times 10 ^ { 5 } M _ { P } and v \leq 2 \times 10 ^ { -27 } c for the mass and recoil speed of the D-particle , respectively .
These bounds are \sim 10 ^ { 8 } times stronger than the latest astrophysical bounds .
These results indicate that the stringy scenario for modified dispersion relations is as vulnerable to these types of tests as the loop quantum gravity schemes .