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Planck-scale dimensional reduction without a preferred frame
Giovanni Amelino-Camelia, Michele Arzano, Giulia Gubitosi +1
Several approaches to quantum gravity suggest that the standard description of spacetime as probed at low-energy, with four dimensions, is replaced in the Planckian regime by a spa…
The measure matters
Giovanni Amelino-Camelia, Michele Arzano, Giulia Gubitosi +1
We adopt a framework where quantum-gravity's dynamical dimensional reduction of spacetime at short distances is described in terms of modified dispersion relations. We observe that…
Pathways to relativistic curved momentum spaces: de Sitter case study
Giovanni Amelino-Camelia, Giulia Gubitosi, Giovanni Palmisano
Several arguments suggest that the Planck scale could be the characteristic scale of curvature of momentum space. As other recent studies we assume that the metric of momentum spac…
Rainbow gravity and scale-invariant fluctuations
Giovanni Amelino-Camelia, Michele Arzano, Giulia Gubitosi +1
We re-examine a recently proposed scenario where the deformed dispersion relations associated with a flow of the spectral dimension to a UV value of 2 leads to a scale-invariant sp…
Noisy soccer balls
Giovanni Amelino-Camelia, Laurent Freidel, Jerzy Kowalski-Glikman +1
In her Comment arXiv:1202.4066 [hep-th] Hossenfelder proposes a generalization of the results we reported in Phys. Rev. D84 (2011) 087702 and argues that thermal fluctuations intro…
Quantum-spacetime scenarios and soft spectral lags of the remarkable GRB130427A
Giovanni Amelino-Camelia, Fabrizio Fiore, Dafne Guetta +1
We process the Fermi LAT data on GRB130427A using the Fermi Science Tools, and we summarize some of the key facts that render this observation truly remarkable, especially concerni…
Dual redshift on Planck-scale-curved momentum spaces
Giovanni Amelino-Camelia, Leonardo Barcaroli, Giulia Gubitosi +1
Several approaches to the investigation of the quantum-gravity problem have provided "theoretical evidence" of a role for the Planck scale in characterizing the geometry of momentu…
Dimensional reduction in the sky
Giovanni Amelino-Camelia, Michele Arzano, Giulia Gubitosi +1
We explore the cosmological implications of a mechanism found in several approaches to quantum-gravity, whereby the spectral dimension of spacetime runs from the standard value of…
Predictive description of Planck-scale-induced spacetime fuzziness
Giovanni Amelino-Camelia, Valerio Astuti, Giacomo Rosati
Several approaches to the quantum-gravity problem predict that spacetime should be "fuzzy", but have been so far unable to provide a crisp physical characterization of this notion.…
Challenge to Macroscopic Probes of Quantum Spacetime Based on Noncommutative Geometry
Giovanni Amelino-Camelia
Over the last decade a growing number of quantum-gravity researchers has been looking for opportunities for the first ever experimental evidence of a Planck-length quantum property…
Possible relevance of quantum spacetime for neutrino-telescope data analyses
Giovanni Amelino-Camelia, Dafne Guetta, Tsvi Piran
One of the primary goals of neutrino telescopes, such as IceCube, is the discovery of neutrinos emitted by gamma-ray bursts (GRBs). Another source of interest in the results obtain…