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Improved limit on quantum-spacetime modifications of Lorentz symmetry from observations of gamma-ray blazars
Giovanni Amelino-Camelia
In the quantum-gravity literature there has been interest in the possibility that quantum properties of spacetime might affect the energy/momentum dispersion relation. The most use…
Group velocity in noncommutative spacetime
Giovanni Amelino-Camelia, Francesco D'Andrea, Gianluca Mandanici
The realization that forthcoming experimental studies, such as the ones planned for the GLAST space telescope, will be sensitive to Planck-scale deviations from Lorentz symmetry ha…
Doubly-Special Relativity: First Results and Key Open Problems
Giovanni Amelino-Camelia
I examine the results obtained so far in exploring the recent proposal of theories of the relativistic transformations between inertial observers that involve both an observer-inde…
On the IR/UV mixing and experimental limits on the parameters of canonical noncommutative spacetimes
Giovanni Amelino-Camelia, Gianluca Mandanici, Kensuke Yoshida
We investigate some issues that are relevant for the derivation of experimental limits on the parameters of canonical noncommutative spacetimes. By analyzing a simple Wess-Zumino-t…
Kinematical solution of the UHE-cosmic-ray puzzle without a preferred class of inertial observers
Giovanni Amelino-Camelia
Among the possible explanations for the puzzling observations of cosmic rays above the GZK cutoff there is growing interest in the ones that represent kinematical solutions, based…
Dirac spinors for Doubly Special Relativity and -Minkowski noncommutative spacetime
Alessandra Agostini, Giovanni Amelino-Camelia, Michele Arzano
We construct a Dirac equation that is consistent with one of the recently-proposed schemes for a "doubly-special relativity", a relativity with both an observer-independent velocit…
On the fate of Lorentz symmetry in loop quantum gravity and noncommutative spacetimes
Giovanni Amelino-Camelia
I analyze the deformation of Lorentz symmetry that holds in certain noncommutative spacetimes and the way in which Lorentz symmetry is broken in other noncommutative spacetimes. I…
Field Theories on Canonical and Lie-Algebra Noncommutative Spacetimes
Giovanni Amelino-Camelia, Michele Arzano, Luisa Doplicher
Field theories on canonical noncommutative spacetimes, which are being studied also in connection with string theory, and on -Minkowski spacetime, which is a popular example of…
Anomalous particle-production thresholds through systematic and non-systematic quantum-gravity effects
Giovanni Amelino-Camelia, Y. Jack NG, Hendrik Van Dam
A growing number of studies is being devoted to the identification of plausible quantum properties of spacetime which might give rise to observably large effects. The literature on…
Quantum-Gravity Phenomenology: Status and Prospects
Giovanni Amelino-Camelia
Over the last few years part of the quantum-gravity community has adopted a more optimistic attitude toward the possibility of finding experimental contexts providing insight on no…
Quantum Space-Time: Deformed Symmetries Versus Broken Symmetries
Giovanni Amelino-Camelia
Several recent studies have concerned the faith of classical symmetries in quantum space-time. In particular, it appears likely that quantum (discretized, noncommutative,...) versi…
Quantum-gravity phenomenology with gamma rays and UHE cosmic rays
Giovanni Amelino-Camelia
In recent years several ideas for experimental searches of effects induced by quantum properties of space-time have been discussed. Some of these ideas concern the role in quantum…
Comparison of relativity theories with observer-independent scales of both velocity and length/mass
Giovanni Amelino-Camelia, Dario Benedetti, Francesco D'Andrea +1
We consider the two most studied proposals of relativity theories with observer-independent scales of both velocity and length/mass: the one discussed by Amelino-Camelia as illustr…