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Quantum gravity phenomenology at the dawn of the multi-messenger era -- A review
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The exploration of the universe has recently entered a new era thanks to the multi-messenger paradigm, characterized by a continuous increase in the quantity and quality of experimental data that is obtained by the detection of the various cosmic messengers (photons, neutrinos, cosmic rays and gravitational waves) from numerous origins. They give us information about their sources in the universe and the properties of the intergalactic medium. Moreover, multi-messenger astronomy opens up the possibility to search for phenomenological signatures of quantum gravity. On the one hand, the most energetic events allow us to test our physical theories at energy regimes which are not directly accessible in accelerators; on the other hand, tiny effects in the propagation of very high energy particles could be amplified by cosmological distances. After decades of merely theoretical investigations, the possibility of obtaining phenomenological indications of Planck-scale effects is a revolutionary step in the quest for a quantum theory of gravity, but it requires cooperation between different communities of physicists (both theoretical and experimental). This review is aimed at promoting this cooperation by giving a state-of-the art account of the interdisciplinary expertise that is needed in the effective search of quantum gravity footprints in the production, propagation and detection of cosmic messengers.
Forward citations
Cited by 14 Pith papers
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Transverse relative locality effects in de Sitter spacetime
A transverse deformation of the 2+1D de Sitter algebra yields energy-dependent transverse shifts and curvature-induced angular deviations for observers separated by a comoving distance.
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Gravitational-wave generation in the presence of Lorentz invariance violation
Gravitational waves in a class of Lorentz-violating gravity theories would have amplitude components that do not decay with distance, strongly constraining those theories.
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Constraining Lorentz invariance violation from the depth of air-shower maximum
A simulation-based toy analysis of Auger Xmax data yields M_LIV > 1.5e21 GeV (95% CL) for subluminal photon-sector Lorentz invariance violation, subject to simplified detector and composition assumptions.
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Cosmological consequences of scale-dependent Barrow-Tsallis entropy
A scale-dependent Barrow-Tsallis entropy cosmology fits cosmic data but is statistically disfavored versus ΛCDM, with only a modest and partially circular Hubble-tension 'alleviation'.
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Bounds on Lorentz invariance violation from muon fluctuations at the Pierre Auger Observatory
Muon-count fluctuations in Auger air showers exclude first-order Lorentz invariance violation in the hadronic sector down to η ≈ −1.3×10⁻⁶ at the highest confidence level reported.
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Fermi Acceleration Mechanisms Beyond Lorentz Symmetry
Fermi-accelerated cosmic-ray spectra acquire energy-dependent spectral indices under κ-Poincaré-deformed or Lorentz-violating kinematics, with a -2 to -3 index transition in the classical basis.
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Modified electron dispersion relations in degenerate white dwarfs
A negative logarithmic deformation of the electron dispersion relation stiffens white-dwarf matter and allows maximum masses from about 1.45 to 1.61 solar masses under standard TOV gravity.
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Bias in Local Spin Measurements from Deformed Symmetries
Local spin measurements on the U_q(su(2)) deformed singlet are biased unless observables are R-matrix-dressed; the claimed unbiased fix is not supported by the paper's own equations.
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Is There New Physics Beyond 30 TeV in the BOAT?
Under quadratic subluminal Lorentz invariance violation, GRB 221009A's spectrum should show a flux recovery above ~30 TeV; the paper motivates a targeted LHAASO search but performs no data analysis.
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Cosmo-Learn: code for learning cosmology using different methods and mock data
An open-source toolkit that simulates late-universe cosmological observations and benchmarks MCMC, genetic algorithms, Gaussian processes, Bayesian ridge regression, and neural networks in one pipeline.
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Shadow constraints of charged black hole with scalar hair and gravitational waves from extreme mass ratio inspirals
EHT shadow data constrain the EMCS black hole charge and scalar hair to about 0.1 and 0.01 levels, while LISA EMRI waveforms could reach 0.01 and 0.0001 levels.
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Generalized Uncertainty Principle mimicking dynamical Dark Energy: matter perturbations and gravitational wave data analysis
In a GUP-modified cosmology, matter fluctuations grow more slowly and the primordial gravitational wave spectrum is enhanced at high frequencies, leading to a claimed bound β ≲ 10^39.
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Polymer Black Hole Surrounded by Quintessence
A polymer black hole with quintessence yields a shadow that can match Sgr A* for many combinations of free parameters while cooling and dimming the black hole.
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The Global Cosmic Ray Observatory -- Challenging next-generation multi-messenger astronomy with interdisciplinary research
GCOS is proposed as a 60,000 km2 cosmic-ray observatory that would boost exposure tenfold and enable charged-particle astronomy, though this paper only restates the design goals.
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