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

Feb 4 – 6, 2026
LAPP
Europe/Paris timezone

Contribution List

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  1. 7. Welcome and workshop presentation
    Dr Sami Caroff (LAPP)
    2/4/26, 9:00 AM
  2. 8. Introduction on Quantum Gravity / Lorentz Invariance Violation theory and BridgeQG cost action
    Giulia Gubitosi (University of Napoli Federico II and INFN)
    2/4/26, 9:10 AM
  3. 9. General talk on LIV and source intrinsic effects
    Tomislav Terzić (University of Rijeka, Faculty of Physics)
    2/4/26, 9:40 AM
  4. 10. Discussion
    2/4/26, 10:10 AM
  5. 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)
    2/4/26, 11:00 AM

    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...

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  6. 2. gLike for Lorentz invariance violation time-of-flight searches: A joint-likelihood framework and thesis case study on BL Lacertae
    Jelena Strišković
    2/4/26, 11:30 AM

    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...

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  7. 3. Discussion
    2/4/26, 12:00 PM
  8. 4. Phenomenology and Astrophysical Probes of Lorentz Invariance Violation and Doubly Special Relativity
    Filip Reščić (University of Rijeka)
    2/4/26, 2:00 PM

    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...

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  9. 5. Constraints on LIV effects from EBL absorption using broadband blazar modeling - Online
    Alberto Rosales De Leon (Observatoire de Paris)
    2/4/26, 2:30 PM

    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...

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  10. 6. Discussion
    2/4/26, 3:00 PM
  11. 11. Gamma-ray bursts as tools to study Lorentz invariance violation
    Lara Nava (INAF)
    2/4/26, 4:00 PM

    Gamma-ray bursts (GRB) are cosmoligocal sources with average redshift around 2, emitting radiation over the entire electromagnetic spectrum. Two different sites are responsible for the radiated emission: one internal to the relativistic jet (responsible for the prompt, higly-variable soft gamma-ray radiation detected over timescales of ms to tens of seconds) and one external, originated from...

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  12. 12. To Be Confirmed - Online
    Prof. Frédéric DAIGNE (Institut d'Astrophysique de Paris - Sorbonne Université)
    2/4/26, 4:30 PM
  13. 13. Discussion
    2/4/26, 5:00 PM
  14. 14. Radiative models for rapid blazar flares - a quick overview
    Andreas Zech (LUTH - Observatoire de Paris)
    2/5/26, 9:00 AM

    When using the light curves of rapid blazar flares for searches of propagation effects, it is important to understand the
    intrinsic temporal and spectral signatures introduced by the underlying particle acceleration and emission processes
    producing those flares. Unfortunately, the nature of these processes is not well known. Most scenarios place the emission
    region inside the relativistic...

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  15. 28. Developments and challenges in neutrino source modeling
    Xavier Rodrigues (APC)
    2/5/26, 9:30 AM

    The IceCube South Pole Observatory detects cosmic neutrinos up to a few PeV, and the KM3NeT experiment in the Mediterranean Sea has recently detected the first event above 100 PeV, inaugurating the era of ultra-high-energy neutrino astronomy. Active black holes, in particular blazar jets, are among the most promising candidate sources. In this talk, I summarize recent developments in...

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  16. 16. Discussion
    2/5/26, 10:00 AM
  17. 17. Investigating AGN Variability with the Cherenkov Telescope Array
    Guillaume Grolleron
    2/5/26, 11:00 AM
  18. 15. Variable extragalactic sources with the LST(s): Status and prospects
    David Sanchez (LAPP/IN2P3)
    2/5/26, 11:30 AM
  19. 29. Discussion
    2/5/26, 12:00 PM
  20. 18. Quantum gravity with high-energy cosmic neutrinos
    Mauricio Bustamante Ramirez (Niels Bohr Institute, University of Copenhagen)
    2/5/26, 2:00 PM

    High-energy cosmic neutrinos probe fundamental physics at scales of energy and distance otherwise unreachable, where new physics may manifest. Since the discovery of TeV-PeV cosmic neutrinos in 2013, we have explored this progressively more broadly and more precisely, thanks to a growing number of detected neutrinos and improvements in reconstruction and analysis techniques. Quantum gravity...

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  21. 20. Unknowns in multimessenger high-energy astrophysics and their influence in the search for Lorentz invariance violation
    DENISE BONCIOLI (University of L'Aquila and INFN-LNGS)
    2/5/26, 2:30 PM

    Searching for new phenomena predicted by quantum-gravity (QG) effects in high-energy astrophysics implies to be able to distinguish the signatures related to standard physics in sources and propagation from the ones coming from pure QG. In this contribution I will focus on the interpretation of ultra-high-energy cosmic ray (UHECR) data in terms of astrophysical scenarios for the fluxes of...

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  22. 22. Discussion
    2/5/26, 3:00 PM
  23. 21. Accelerating Multiwavelength and Multimessenger Data Modeling with Neural-Network Surrogates
    Narek Sahakyan (ICRANet-Armenia)
    2/5/26, 4:00 PM

    Multiwavelength and multimessenger observations, combining data across the electromagnetic spectrum with high-energy neutrinos, provide a uniquely powerful probe of the physical processes at work in the relativistic jets of blazars. Recent campaigns and coincident neutrino detections have reinforced the role of blazars as prime laboratories for studying particle acceleration and radiation in...

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  24. 26. Astrophysical Searches for Quantum Gravity: what multi-messenger observations can (and cannot) tell us
    Rafael Alves Batista, Rafael Alves Batista (Sorbonne Université, Institut d'Astrophysique de Paris)
    2/5/26, 4:30 PM

    What if there are already signatures of quantum gravity (QG) in the existing high-energy multi-messenger data -- would we be able to know that?
    In this talk, I discuss the complexities inherent in separating new physics from conventional astrophysical processes. Disentangling these two signals is not merely a technical challenge; it is an epistemic one. I argue that we are currently limited...

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  25. 27. Discussion
    2/5/26, 5:00 PM
  26. 24. Distinguish timelags due to LIV effects from timelags induced by intrinsic effects
    HELENE SOL (LUTH)
    2/6/26, 9:00 AM
  27. 25. Tackling distinction between LIV timelag and intrinsic effects with minimalistic methods
    Dr Sami Caroff (LAPP)
    2/6/26, 9:15 AM
  28. 23. Collaboration / Funding / discussion
    Dr Julien Bolmont (LPNHE - SU/CNRS-IN2P3)
    2/6/26, 10:00 AM
  29. 19. Discussion