MG13 - Talk detail |
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Participant |
Rosati, Giacomo | |||||||
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Institution |
Dipartimento di Fisica, Università La Sapienza, Roma - Piazzale Aldo Moro 2 - Rome - Lazio - Italy | |||||||
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Session |
GRB5 |
Accepted |
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Talk |
Oral abstract |
Title |
Deformed Lorentz symmetry in expanding spacetimes and the Fermi telescope | |||||
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Abstract |
Observations of gamma-ray bursts are being used to test for a momentum dependence of the speed of photons, partly motivated by preliminary results reported in analyses of some quantum-spacetime scenarios. The relationship between time of arrival, momentum of the photon and redshift of the source which is used for these purposes assumes a "breakdown" of relativistic symmetries, meaning that it is a preferred-frame scenario which does not satisfy the Relativity Principle. The alternative hypothesis of a "deformation" of relativistic symmetries, which preserves the Relativity Principle by adopting deformed laws of relativistic transformation between observers, could not so far be tested in gamma-ray-burst observations because it was not known how to formulate it in expanding spacetimes. We here provide such a formulation, and we find that also for the symmetry-deformation scenario the analysis of gamma-ray-burst data take us very close to the desired "Planck-scale sensitivity" |
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Session |
QG2 |
Accepted |
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Time |
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Talk |
Oral abstract |
Title |
Deformed Lorentz symmetry and relative locality in an expanding spacetime | |||||
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Abstract |
Over the last decade there has been strong interest in the quantum-gravity literature, both conceptually and for what concerns testable predictions, in the possibility of Planck-scale-deformed Lorentz symmetry. For the case of flat spacetime it was recently realized that deformed Lorentz symmetry implies ``relative locality", a notion which I here review on the basis of my previous study PhysRevLett106(2011)071301. I also report on my more recent results generalizing the description of deformed Lorentz symmetry and relative locality in a curved (expanding) spacetime, which are based on a deformation of the De Sitter algebra. |
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