A5013915206- Noncommutative and Quantum Gravity Theories
- Cosmology and Gravitation Theories
- Black Holes and Theoretical Physics
- Quantum Mechanics and Applications
- Particle physics theoretical and experimental studies
- Quantum Electrodynamics and Casimir Effect
- Relativity and Gravitational Theory
- Advanced Differential Geometry Research
- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Neutrino Physics Research
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Quantum and electron transport phenomena
- Pulsars and Gravitational Waves Research
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Atomic and Subatomic Physics Research
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Operator Algebra Research
- Quantum, superfluid, helium dynamics
- Quantum many-body systems
- Physics of Superconductivity and Magnetism
- Advanced Mathematical Theories and Applications
- Algebraic structures and combinatorial models
Istituto Nazionale di Fisica Nucleare, Sezione di Napoli
1994-2025
University of Naples Federico II
2019-2023
Federico II University Hospital
2020
Sapienza University of Rome
2008-2017
Istituto Nazionale di Fisica Nucleare, Sezione di Roma I
2008-2017
Istituto Nazionale di Fisica Nucleare
2007-2017
Massachusetts Institute of Technology
1994-2007
European Organization for Nuclear Research
1999-2007
Perimeter Institute
2003-2004
University of Oxford
1996-1999
I show that it is possible to formulate the Relativity postulates in a way does not lead inconsistencies case of spacetimes whose short-distance structure governed by an observer-independent length scale. The consistency these proves incorrect expectation modifications rules kinematics involving Planck would necessarily require introduction preferred class inertial observers. In particular, for every observer agree on physical laws supporting deformed dispersion relations type E 2 -c p 4 m +...
We propose a deepening of the relativity principle according to which invariant arena for non-quantum physics is phase space rather than spacetime. Descriptions particles propagating and interacting in spacetimes are constructed by observers, but different separated from each other translations, construct spacetime projections space. Nonetheless, all observers agree that interactions local coordinates them. This framework, absolute locality replaced relative locality, results deforming...
The exploration of the universe has recently entered a new era thanks to multi-messenger paradigm, characterized by continuous increase in quantity and quality experimental data that is obtained detection various cosmic messengers (photons, neutrinos, rays gravitational waves) from numerous origins. They give us information about their sources properties intergalactic medium. Moreover, astronomy opens up possibility search for phenomenological signatures quantum gravity. On one hand, most...
Abstract The unification of quantum mechanics and general relativity has long been elusive. Only recently have empirical predictions various possible theories gravity put to test, where a clear signal properties is still missing. dawn multi-messenger high-energy astrophysics tremendously beneficial, as it allows us study particles with much higher energies travelling longer distances than in terrestrial experiments, but more progress needed on several fronts. A thorough appraisal current...
One of the most puzzling current experimental physics paradoxes is arrival on Earth ultrahigh energy cosmic rays (UHECRs) with energies above Greisen-Zatsepin-Kuzmin threshold $(5\ifmmode\times\else\texttimes\fi{}{10}^{19} \mathrm{eV}).$ Photopion production by microwave background radiation photons should reduce these protons below this level. The recent observation 20 TeV from Mk 501 (a BL Lac object at a distance 150 Mpc) another somewhat similar paradox. These high have disappeared due...
Within a Liouville approach to non-critical string theory, we discuss space-time foam effects on the propagation of low-energy particles. We find an induced frequency-dependent dispersion in wave packet, and observe that this would affect outcome measurements involving particles as probes. In particular, maximum possible order magnitude give rise error measurement distance comparable independently obtained some recent heuristic quantum-gravity analyses. also briefly compare these estimates...
I examine the results obtained so far in exploring recent proposal of theories relativistic transformations between inertial observers that involve both an observer-independent velocity scale and length/momentum scale. also discuss what appear to be key open issues for this research line.
Quantum group Fourier transform methods are applied to the study of processes on noncommutative Minkowski space–time [x i , t]=ιλx . A natural wave equation is derived and associated phenomena in vacuo dispersion discussed. Assuming deformation scale λ order Planck length one finds that effects large enough be tested experimental investigations astrophysical such as gamma-ray bursts. We also outline a new approach construction field theories space–time, with noncommutativity equivalent under...
I report, emphasizing some key open issues and aspects that are particularly relevant for phenomenology, on the status of development “doubly-special” relativistic (“DSR”) theories with both an observer-independent high-velocity scale small-length/large-momentum scale, possibly Planck-scale/quantum-gravity realm. also give a true/false characterization structure these theories. In particular, discuss DSR scenario without modification energy-momentum dispersion relation қ-Poincaré Hopf...
In several approaches to the quantum-gravity problem evidence has emerged of validity a 'GUP' (a generalized position–momentum uncertainty principle) and/or 'MDR' modification energy–momentum dispersion relation), but very little is known about implications GUPs and MDRs for black-hole thermodynamics, another key topic research. We investigate an apparent link, already suggested in earlier exploratory study involving two us, between possibility GUP MDR log term area–entropy formula. then...
We present a simple algebraic mechanism for the emergence of deformations Poincaré symmetries in low-energy limit quantum theories gravity. The deformations, called κ-Poincaré algebras, are parametrized by dimensional parameter proportional to Planck mass, and imply modified energy–momentum relations type that may be observable near future experiments. Our analysis assumes low energy theory gravity must also involve which cosmological constant is taken very small with respect scale, makes...
We explore a possible connection between two aspects of loop quantum gravity which have been extensively studied in the recent literature: black-hole area-entropy law and energy-momentum dispersion relation. observe that original Bekenstein argument for implicitly requires information on relation position-momentum uncertainty Recent results show first approximation entropy depends linearly area, with small correction terms logarithmic or inverse-power dependence area. And it has argued...
We discuss the prospects for bounding and perhaps even measuring quantum gravity effects on dispersion of light using highest-energy photons produced in gamma-ray bursts (GRBs) measured by Fermi telescope. These are brighter than might have been expected, as first ten months operation, has so far reported eight events with over 100 MeV seen its Large Area Telescope. review features these which may bear Planck-scale phenomenology, we possible implications alternative scenarios in-vacua coming...
Physical theories are developed to describe phenomena in particular regimes, and generally valid only within a limited range of scales.For example, general relativity provides an effective description the Universe at large length scales, has been tested from cosmic scale down distances as small 10 meters [1,2].In contrast, quantum theory physics scales.Direct tests have performed smallest probeable scales Large Hadron Collider, ∼10 -20 meters, up that hundreds kilometers [3].Yet, such fall...
We derive finite boost transformations based on the Lorentz sector of bicross-product-basis κ-Poincaré Hopf algebra. emphasize role these in a recently-proposed new relativistic theory, and their relevance for experimental studies presently being planned. find that when (dimensionful) deformation parameter is identified with Planck length, which together speed-of-light constant has status observer-independent scale deformed boosts saturate at value momentum corresponds to inverse length.