2014/03/31 by Sabine Hossenfelder
Physics and Astronomy · #gr-qc #hep-ph
paper · pdf · doi:10.3842/sigma.2014.074
published as SIGMA 10 (2014), 074, 8 pages
arxiv created 2014/07/29 · arxiv updated 2014/07/30
The idea that Lorentz-symmetry in momentum space could be modified but still remain observer-independent has received quite some attention in the recent years. This modified Lorentz-symmetry, which has been argued to arise in Loop Quantum Gravity, is being used as a phenomenological model to test possibly observable effects of quantum gravity. The most pressing problem in these models is the treatment of multi-particle states, known as the 'soccer-ball problem'. This article briefly reviews the problem and the status of existing solution attempts.