BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Anna Pachol (Queen Mary University of London) DTSTART:20201208T141500Z DTEND:20201208T154500Z DTSTAMP:20260423T024425Z UID:UTPhysics/9 DESCRIPTION:Title: Observables and quantum spacetimes\nby Anna Pachol (Queen Mary Unive rsity of London) as part of Theoretical physics seminar @ Tartu\n\nLecture held in Physicum room A101\, University of Tartu\, Estonia.\n\nAbstract\n Noncommutative geometry\, as the generalised notion of geometry\, can be h elpful in providing the phenomenological models quantifying the effects of quantum gravity. The noncommutative nature allows for obtaining quantum g ravitational corrections to the classical solutions. One of the mostly stu died possible phenomenological effects of quantum gravity is the modificat ions in wave dispersion.\n\nIn my talk I will introduce the mathematical f ramework for quantum spacetimes within the Hopf algebras and Drinfeld twis ts formalisms. Twisted differential calculus and twisting generators of th e Hopf algebra symmetry allow on a fresh look on modifications in dispersi on relations and offer a proper choice of physical observables as generato rs of the quantum Lie algebra of symmetries. Wave equations on noncommutat ive spaces are derived from a quantum Hodge star operator. The formalism a lso allows for study of the curved backgrounds. I will present recent resu lts on propagation of waves in noncommutative cosmology and on the modific ation of the dispersion relations due to noncommutativity combined with cu rvature of spacetime.\n\nThe talk will base on the results developed in co llaboration with P. Aschieri and A. Borowiec [Observables and Dispersion R elations in k-Minkowski Spacetime J. High Energ. Phys. 2017\, 152 (2017) a rXiv:1703.08726\, Dispersion Relations in κ-Noncommutative Cosmology arXi v:2009.01051].\n LOCATION:https://researchseminars.org/talk/UTPhysics/9/ END:VEVENT END:VCALENDAR