### Symmetry, Integrability and Geometry: Methods and Applications (SIGMA)

SIGMA 10 (2014), 074, 8 pages      arXiv:1403.2080      https://doi.org/10.3842/SIGMA.2014.074
Contribution to the Special Issue on Deformations of Space-Time and its Symmetries

### The Soccer-Ball Problem

Sabine Hossenfelder
Nordita, KTH Royal Institute of Technology and Stockholm University, Roslagstullsbacken 23, SE-106 91 Stockholm, Sweden

Received March 11, 2014, in final form July 03, 2014; Published online July 09, 2014; Text overlap with [24] removed July 29, 2014

Abstract
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.

Key words: Lorentz-invariance; quantum gravity; quantum gravity phenomenology; deformed special relativity.

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