Bridging high and low energies in search of quantum gravity - 2025 Cost Action CA23130 First Annual Conference

Session

WG2 High Energy QG Experiments

8 Jul 2025, 14:00

Amphithéâtre Charpak (LPNHE)

88. When astroparticles arrive at Earth - new ways for investigating LIV

Denise Boncioli

08/07/2025, 14:00

Invited oral contribution (hot topic)

Lorentz invariance can be tested by making use of ultra-high energy cosmic rays (UHECRs), namely the highest energy particles in the Universe. Their interactions in the extragalactic space can be altered if some level of Lorentz invariance violation (LIV) is present, which may lead to detectable fingerprints in the expected fluxes.
The scenario is actually more complicated than expected, due...

62. New constraints on Lorentz invariance violations from H.E.S.S. observations of the blazar PKS 2155-304 flaring period of July 2006

Ugo Pensec

08/07/2025, 14:40

Oral contribution

Lorentz invariance is a cornerstone of modern physics. However, certain quantum gravity models suggest potential violations of Lorentz symmetry (LIV) at high energy scales. Blazars, such as PKS 2155-304, are powerful, variable sources of very high-energy gamma rays and provide an ideal setting for testing such phenomena. We analyze the temporal and spectral properties of the July 29, 2006 PKS...

65. Assessing SWGO Sensitivity to Lorentz Invariance Violation through Transparency Studies

Filip Reščić (University of Rijeka)

08/07/2025, 15:00

Oral contribution

This work presents a sensitivity study exploring the capability of the planned Southern Wide-Field Gamma-Ray Observatory (SWGO)—a future water Cherenkov detector array to be built in Chile and designed to probe gamma rays up to the PeV scale—enabling studies such as the search for potential signatures of Lorentz Invariance Violation (LIV). Focusing on transparency studies, we simulate the...

57. Neutrino oscillations and decoherence: insights from microscopic models

Renata Ferrero (FAU Erlangen)

08/07/2025, 15:20

Oral contribution

Decoherence plays a key role in neutrino oscillations by describing how environmental interactions—such as with matter or gravity—can alter flavor oscillation patterns and reveal aspects of neutrino quantum behavior. Typically, studies of neutrino oscillations encode decoherence by making a phenomenological ansatz for the dissipator. Such decoherence effects can also be systematically derived...

30. Advancing superluminal neutrino constraints with UHE events

José Manuel Carmona (University of Zaragoza / CAPA)

08/07/2025, 15:40

Oral contribution

The recent detection of a neutrino event with an energy of approximately 100 PeV by KM3NeT has opened the window of ultra-high-energy (UHE) neutrino astronomy. This newly accessible regime offers an unprecedented opportunity to explore new physics. In particular, a population of UHE neutrinos has implications for scenarios of Lorentz Invariance Violation (LIV), where neutrinos with a modified...

60. Testing in-vacuo dispersion with GRB neutrinos

Domenico Frattulillo (Istituto Nazionale di Fisica Nucleare, Sezione di Napoli)

08/07/2025, 16:00

Oral contribution

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 delaying them proportionally to their energy, an effect often labeled as "quantum-spacetime-induced in-vacuo dispersion".
We introduce a novel approach to the search of quantum-spacetime-affected GRB...