# Quantum reference frames and deformed symmetries

 Titre Quantum reference frames and deformed symmetries Type de publication Journal Article Nouvelles publications 2008 Auteurs Girelli, F, Poulin, D Journal Phys. Rev. D Volume 77 Pagination 104012 Mots clés Foundations, Gravity, Reference frame Résumé In the context of constrained quantum mechanics, reference systems are used to construct relational observables that are invariant under the action of the symmetry group. Upon measurement of a relational observable, the reference system undergoes an unavoidable measurement back-action" that modifies its properties. In a quantum-gravitational setting, it has been argued that such a back-action may produce effects that are described at an effective level as a form of deformed (or doubly) special relativity. We examine this possibility using a simple constrained system that has been extensively studied in the context of quantum information. While our conclusions support the idea of a symmetry deformation, they also reveal a host of other effects that may be relevant to the context of quantum gravity, and could potentially conceal the symmetry deformation. Texte complet