Maria Grazia Di Luca

Istituto Nazionale di Fisica Nucleare, Sezione di Napoli

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Giovanni Amelino-Camelia

Istituto Nazionale di Fisica Nucleare, Sezione di Napoli

Giacomo Rosati

University of Wrocław

Gianluca Calcagni

Instituto de Estructura de la Materia

Flavio Mercati

Universidad de Burgos

Giulia Gubitosi

University of Naples Federico II

Domenico Frattulillo

Istituto Nazionale di Fisica Nucleare, Sezione di Napoli

Giuseppe Fabiano

Istituto Nazionale di Fisica Nucleare, Sezione di Napoli

N. E. Mavromatos

King's College London

F. Schüßler

Institut de Recherche sur les Lois Fondamentales de l'Univers

Marcos López

Universidad Complutense de Madrid

Cooperative Institutions

Centre National de la Recherche Scientifique

Istituto Nazionale di Fisica Nucleare, Sezione di Napoli

Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Gran Sasso

Istituto Nazionale di Fisica Nucleare

Sorbonne Université

Institut National de Physique Nucléaire et de Physique des Particules

University of L'Aquila

Laboratoire de Physique Nucléaire et de Hautes Énergies

Institute for High Energy Physics

Université Paris Cité

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Quantum gravity phenomenology at the dawn of the multi-messenger era -- A review.

arXiv (Cornell University) (2021)

Andrea Addazi J. Álvarez-Muñiz Rafael Alves Batista Giovanni Amelino-Camelia V. Antonelli

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.

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Quantum gravity phenomenology at the dawn of the multi-messenger era—A review

Progress in Particle and Nuclear Physics (2022)

Andrea Addazi J. Álvarez-Muñiz Rafael Alves Batista Giovanni Amelino-Camelia V. Antonelli

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, prepared within the COST Action CA18108 "Quantum gravity phenomenology in the multi-messenger approach", 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.

10.1016/j.ppnp.2022.103948

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Could quantum gravity slow down neutrinos?

arXiv (Cornell University) (2022)

Giovanni Amelino-Camelia Maria Grazia Di Luca Giulia Gubitosi Giacomo Rosati Giacomo D’Amico

In addition to its implications for astrophysics, the hunt for GRB neutrinos could also be significant in quantum-gravity research, since they are excellent probes of the microscopic fabric of spacetime. Some previous studies based on IceCube neutrinos had found intriguing preliminary evidence that some of them might be GRB neutrinos with travel times affected by quantum properties of spacetime, with the noticeable feature that quantum spacetime would slow down some of the neutrinos while others would be sped up. Recently the IceCube collaboration revised significantly the estimates of the direction of observation of their neutrinos, and we here investigate how the corrected directional information affects the results of the previous quantum-spacetime-inspired analyses. We find that there is now no evidence for neutrinos sped up by quantum-spacetime properties, whereas the evidence for neutrinos slowed down by quantum spacetime is even stronger than previously found. Our most conservative estimates find a false alarm probability of less than 1% for these "slow neutrinos", providing motivation for future studies on larger data samples.

Cosmic neutrino background

10.48550/arxiv.2209.13726

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New class of plane waves for κ -noncommutative quantum field theory

Physical review. D/Physical review. D. (2023)

Maria Grazia Di Luca Flavio Mercati

We discuss the construction of a free scalar quantum field theory on $\ensuremath{\kappa}$-Minkowski noncommutative spacetime. We do so in terms of $\ensuremath{\kappa}$-Poincar\'e-invariant $N$-point functions, i.e., multilocal functions which respect the deformed symmetries of the spacetime. As shown in a previous paper by some of us, this is only possible for a lightlike version of the commutation relations, which allow the construction of a covariant algebra of $N$ points that generalizes the $\ensuremath{\kappa}$-Minkowski commutation relations. We solve the main shortcoming of our previous approach, which prevented the development of a fully covariant quantum field theory: the emergence of a non-Lorentz-invariant boundary of momentum space. To solve this issue, we propose to ``extend'' momentum space by introducing a class of new Fourier modes and we prove that this approach leads to a consistent definition of the Pauli-Jordan function, which turns out to be undeformed with respect to the commutative case. We finally address the quantization of our scalar field and obtain a deformed, $\ensuremath{\kappa}$-Poincar\'e-invariant, version of the bosonic oscillator algebra.

Scalar field theory

10.1103/physrevd.107.105018

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Could quantum gravity slow down neutrinos?

Nature Astronomy (2023)

Giovanni Amelino-Camelia Maria Grazia Di Luca Giulia Gubitosi Giacomo Rosati Giacomo D’Amico

10.1038/s41550-023-01993-z

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Standard model anomalies: lepton flavour non-universality, g − 2 and W-mass

Journal of High Energy Physics (2022)

Alessandra D’Alise Guglielmo De Nardo Maria Grazia Di Luca Giuseppe Fabiano Domenico Frattulillo

A bstract We critically analyze the body of results that hints to the existence of New Physics from possible violations of lepton universality observed by the LHCb experiment in the μ/e ratios R K and $$ {R}_{K^{\ast }} $$ R K ∗ to the g − 2 lepton anomalies. The analysis begins with a theoretical, in depth, study of the μ/e ratios R K and $$ {R}_{K^{\ast }} $$ R K ∗ as well as the process B s → μ + μ − . Here we consider the impact of complex Wilson coefficients and derive constraints on their imaginary and real parts. We then move to a comprehensive comparison with experimental results. We show that, by fitting a single Wilson coefficient, the deviations from the Standard Model are at the 4 . 7 σ level when including only the hadronic insensitive observables while it increases to 6 . 1 σ when including also the hadronic sensitive ones. When switching on all relevant Wilson coefficients and combining both hadronic sensitive and insensitive data into the fit, the deviation from the Standard Model peaks at 7 . 2 σ and decreases at the 4 . 9 σ level if we assume that the central values of R K and $$ {R}_K^{\ast } $$ R K ∗ are taken to be unity. We further estimate other unaccounted for SM contributions and show that their inclusion still requires New Physics to fit the data. We then introduce the g − 2 lepton anomalies as well as the most recent W -mass results. Different theoretical models are considered that can explain the discrepancies from the Standard Model. In the final part of our work we estimate the impact of the forthcoming data from LHCb (coming from LHC Run3) and Belle II, when it will have accumulated about 5 ab − 1 .

Flavour

10.1007/jhep08(2022)125

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Lectures on classical and quantum cosmology

arXiv (Cornell University) (2022)

Gianluca Calcagni Maria Grazia Di Luca Tomáš Fodran

These lecture notes introduce the reader to the hot big bang model, cosmological perturbations, gravitational waves, the cosmic microwave background, inflation, the singularity problem, the cosmological constant problem and the cosmology of quantum gravity.

Initial singularity

Loop Quantum Cosmology

Big Bounce

Non-standard cosmology

Cosmological constant

10.48550/arxiv.2202.13875

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Citations (2)

New class of plane waves for $κ$-noncommutative Quantum Field Theory

arXiv (Cornell University) (2022)

Maria Grazia Di Luca Flavio Mercati

We discuss the construction of a free scalar quantum field theory on $\kappa$-Minkowski noncommutative spacetime. We do so in terms of $\kappa$-Poincar\'e-invariant $N$-point functions, i.e. multilocal functions which respect the deformed symmetries of the spacetime. As shown in a previous paper by some of us, this is only possible for a lightlike version of the commutation relations, which allow the construction of a covariant algebra of $N$ points that generalizes the $\kappa$-Minkowski commutation relations. We solve the main shortcoming of our previous approach, which prevented the development of a fully covariant quantum field theory: the emergence of a non-Lorentz-invariant boundary of momentum space. To solve this issue, we propose to ``extend" momentum space by introducing a class of new Fourier modes and we prove that this approach leads to a consistent definition of the Pauli-Jordan function, which turns out to be undeformed with respect to the commutative case. We finally address the quantization of our scalar field and obtain a deformed, $\kappa$-Poincar\'e-invariant, version of the bosonic oscillator algebra.

Scalar field theory

10.48550/arxiv.2211.11627

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Lectures on classical and quantum cosmology

Proceedings of Corfu Summer Institute 2021 "School and Workshops on Elementary Particle Physics and Gravity" — PoS(CORFU2021) (2022)

Gianluca Calcagni Maria Grazia Di Luca Tomáš Fodran

Initial singularity

Big Bounce

Non-standard cosmology

Loop Quantum Cosmology

Cosmological constant

10.22323/1.406.0317

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Citations (7)