Special relativity asserts that physical phenomena appear the same to all unaccelerated observers. This is called Lorentz symmetry and relates long wavelengths to short ones: if the symmetry is exact it implies that space-time must look the same at all length scales. Several approaches to quantum gravity, however, suggest that there may be a microscopic structure of space-time that leads to a violation of Lorentz symmetry. This might arise because of the discreteness1 or non-commutivity2 of space-time, or through the action of extra dimensions3. Here we determine a very strong constraint on a type of Lorentz violation that produces a maximum electron speed less than the speed of light. We use the observation of 100-MeV synchrotron radiation from the Crab nebula to improve the previous limit by a factor of 40 million, ruling out this type of Lorentz violation, and thereby providing an important constraint on theories of quantum gravity.
|Titolo:||A Strong astrophysical constraint on the violation of special relativity by quantum gravity|
|Autori:||T. JACOBSON; LIBERATI S; D. MATTINGLY|
|Data di pubblicazione:||2003|
|Digital Object Identifier (DOI):||10.1038/nature01882|
|Appare nelle tipologie:||1.1 Journal article|