Quantum gravity phenomenology at the dawn of the multi-messenger era—A review
Abstract
The exploration of the universe has recently entered a new era thanks to the multi-\nmessenger paradigm, characterized by a continuous increase in the quantity and quality\nof experimental data that is obtained by the detection of the various cosmic messengers\n(photons, neutrinos, cosmic rays and gravitational waves) from numerous origins. They\ngive us information about their sources in the universe and the properties of the\nintergalactic medium. Moreover, multi-messenger astronomy opens up the possibility to\nsearch for phenomenological signatures of quantum gravity. On the one hand, the most\nenergetic events allow us to test our physical theories at energy regimes which are not\ndirectly accessible in accelerators; on the other hand, tiny effects in the propagation of\nvery high energy particles could be amplified by cosmological distances. After decades\nof merely theoretical investigations, the possibility of obtaining phenomenological indi-\ncations of Planck-scale effects is a revolutionary step in the quest for a quantum theory\nof gravity, but it requires cooperation between different communities of physicists\n(both theoretical and experimental). This review, prepared within the COST Action\nCA18108 ‘‘Quantum gravity phenomenology in the multi-messenger approach", is aimed\nat promoting this cooperation by giving a state-of-the art account of the interdisciplinary\nexpertise that is needed in the effective search of quantum gravity footprints in the\nproduction,…
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