BridgeQG Workshop - Bridging High-Energy Astrophysical Modelling and Lorentz Invariance Violation Studies

Session

State-of-the-art LIV studies with photons

4 févr. 2026, 11:00

Auditorium (LAPP)

1. Disentangling intrinsic source effects from LIV ones in time-lag researches with VHE gamma-rays by combining data from various observatories

Cyann PLARD (LPNHE - CNRS), Cyann Plard (LAPP)

04/02/2026 11:00

One way of detecting or constraining Lorentz invariance violation (LIV) effects is by measuring time delays in the arrival of very high-energy (VHE) photons from astrophysical sources. Suitable targets are variable, distant and highly energetic objects such as pulsars, gamma-ray bursts (GRBs), and active galactic nuclei (AGN) flares. However, a major challenge arises from intrinsic time lags...

2. gLike for Lorentz invariance violation time-of-flight searches: A joint-likelihood framework and thesis case study on BL Lacertae

Jelena Strišković

04/02/2026 11:30

Robust tests of Lorentz invariance violation (LIV) require the combination of multiple datasets to disentangle intrinsic source effects from propagation-induced lags. In this talk, I present results and methods published in my PhD thesis, based on a joint LIV time-of-flight analysis of two BL Lacertae very-high-energy flares observed by imaging atmospheric Cherenkov telescopes: MAGIC (19–20...

3. Discussion

04/02/2026 12:00

4. Phenomenology and Astrophysical Probes of Lorentz Invariance Violation and Doubly Special Relativity

Filip Reščić (University of Rijeka)

04/02/2026 14:00

In this talk I will discuss the general phenomenological features of Lorentz Invariance Violation (LIV) and Doubly Special Relativity (DSR) frameworks. Particular attention will be given to anomalies in the flux of very-high-energy (VHE) and ultra-high-energy (UHE) gamma rays from astrophysical sources, arising from modifications of interaction thresholds induced in LIV and DSR scenarios. Such...

5. Constraints on LIV effects from EBL absorption using broadband blazar modeling - Online

Alberto Rosales De Leon (Observatoire de Paris)

04/02/2026 14:30

Lorentz Invariance Violation (LIV) effects are predicted in some theories of Quantum Gravity (QG) and would manifest as energy-dependent modifications to particle kinematics. Such effects can alter the threshold of the electron–positron pair production process, leading to observable deviations in the absorption of very-high-energy photons by the Extragalactic Background Light (EBL). We exploit...

6. Discussion

04/02/2026 15:00