CALYPSO
Project with a twofold focus:
- Development of a precision phenomenological framework for LIV tests based of the development of atmospheric particle showers. The goal is to compute LIV-modified electromagnetic interaction cross sections; implement them in CORSIKA 8; identify and characterise sensitive shower observables; set quantitative constraints from existing data obtained with telescopes CTAO-LST and MAGIC; and forecast sensitivity for the Southern Wide-field Gamma-ray Observatory (SWGO).
- Development of an internal LED calibration unit for the outer-layer detector tanks of the Southern Wide-Field Gamma-ray Observatory (SWGO), providing in-situ monitoring of photomultiplier timing and gain during detector operation.
More details on the project can be found in the dedicated page https://wrinkle.uniri.hr/CALYPSO/.
ANN-VIL
Project of developing and using artificial neural networks (ANN) to study Lorentz invariance violation. The main motivation is testing several coexisting LIV effects (as predicted by a given LIV model) is a single analysis.
γ-ray LIV WG
Cooperation agreement between H.E.S.S., LST, MAGIC, and VERITAS experiments with the intention of combining data from these facilities in a single LIV study, an approach that has never been tried before for.
γ-ray LIV WG objectives: Stacking of results to obtain the best possible sensitivity to LIV effects through
- Development of a standard analysis procedure for individual sources and a standard way to estimate statistical and systematic uncertainties.
- Development of procedures for combination of various observational data from H.E.S.S., LST, MAGIC, and VERITAS experiments.
- Resolving of the redshift dependence of effects from source intrinsic effects.
Data sharing is regulated by the Memorandum of Understanding signed by these collaborations.
WG coordinator: T. Terzić (2022 – ).
SWGO sensitivity to LIV
This research focuses on assessing how the Southern Wide-Field Gamma-ray Observatory (SWGO) could detect effects of Lorentz Invariance Violation (LIV) within the quadratic subluminal scenario in very high and ultra-high energy gamma rays. Intrinsic spectral energy distributions of astrophysical sources are modeled, and then attenuated using both special relativistic and LIV-modified survival probabilities. These two attenuation models are compared with SWGO’s projected sensitivity in the relevant energy ranges to explore SWGO’s potential to identify or limit possible LIV effects.
Collaborators: Michele Doro (UNIPD)
Theoretical studies of LIV and DSR
This project involves theoretical calculations within the framework of the quadratic subluminal scenario of Lorentz Invariance Violation (LIV) and the exploration of phenomenological models in Doubly Special Relativity (DSR). Given that the primary interaction in studies of Universe transparency is electron-positron pair production from photon collisions, this work centers on calculating key observables, including the cross-section of this process and the corresponding opacity function in the different models.
Collaborators: José Manuel Carmona (UNIZAR), Jose Luis Cortés (UNIZAR).