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...
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...
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...
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...
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...
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...
