WG3: Gamma rays

Contacts | Objectives |Tasks | Milestones | Members | Talks | Related works


Group Leader: Tomislav Terzić (University of Rijeka, Croatia)
Group Vice-Leader: Julian Sitarek (University of Lodz, Poland)

Objectives (shared with WG4, WG5 and WG6)

To analyze the current state of the art of the experimental astronomy of each type of cosmic messenger with respect to the Action’s challenge and identify opportunities for improving the analysis strategies which are currently being followed, in the light of the theoretical frameworks and considerations of WG1 and WG2. To provide WG1 and WG2 with the technical details related to the detection of each type of astrophysical messenger, which need to be considered for a correct phenomenological and theoretical interpretation of the experimental results. To develop new analysis strategies that combine the observations of gamma rays, cosmic rays, neutrinos and gravitational waves for the search of quantum gravity signatures in the framework of multi-messenger astronomy. These new
strategies should be developed in close cooperation with WG1 and specially with WG2. Finally, these WGs will transfer the Action’s motivations, progress and results, to their respective communities of experimentalists to promote their interest on the Action’s challenge.


Set-up, maintain and regularly update a database of all existing results on LIV based on time of flight studies with gamma-rays; compare the methods and results of different studies; establish a common strategy and optimal method for analyzing data from different source classes [GRB, active galactic nuclei (AGN), pulsars] and different instruments (ground-based Cherenkov telescopes, satellite detectors), using the triggers from observations in other wavelengths and messengers, and taking into account both the status of already published proto-population studies (mostly with GRBs), and future population studies that will consider data from tens of objects and different experiments (IACTs, satellites) combined together; work on our understanding of the sources themselves in order to isolate source-intrinsic temporal effects, which will allow to put more stringent constraints on LIV; develop a standard to characterize atmospheric aerosols based on LIDAR (Light Detection and Ranging) and stellar extinction measurements, and provide the corresponding corrections to IACT data, based on tailored Monte Carlo simulations; devise strategy for observing more astrophysical phenomena suitable for LIV studies with pointing instruments (e.g. AGN flares observed with IACT); in cooperation with WG1-2, identify possible signatures in gamma-ray signals of other hypothetical phenomena (e.g. axion-like particles).


  • Year 1: Set-up a database of all existing results on LIV based on gamma-rays and publish it on web page. Compare the results and methods used.
  • Year 2: Optimization of strategies and methods for performing LIV studies based on gamma-rays, benefitting at best from AGN flare observation strategies conceived for astrophysical studies.
  • Year 3: List of possible signatures in gamma-ray signals of other hypothetical phenomena and possible methods for detecting signatures.
  • Year 4: Development of multi-messenger search strategies based on the phenomenological models developed by WG1 and WG2.

Joint WG3-WG4-WG5 deliverables and activities

  • Publicly available web page with results of LIV studies based on each cosmic messenger.
  • Optimal strategy and method for performing LIV studies (including future experiments and a multi-messenger approach).
  • Publications, and contributions to conferences.
  • Contributions to the communication and outreach activities.
  • Organization of regular video conferences
  • Organization of workshops for specific topics involving also WG1-2

WG members

Adam Nepomuk OtteGeorgia Institute of TechnologyUSA
Alasdair GentGeorgia Institute of TechnologyUSA
Alessandro de AngelisUniversity & INFN PadovaItaly
Andrea AddaziINFN Roma 2Italy
Antonino MarcianòINFN Frascati LNFItaly
Aurora ClericiUniversity of Nova GoricaSlovenia
Bo-Qiang MaPeking UniversityChina
Cédric PerennesUniversity & INFN PadovaItaly
Christelle LevyLPNHEFrance
Christian PfeiferZARM, University of BremenGermany
Christopher EcknerUniversity of Nova GoricaSlovenia
Daniel KerszbergIFAE BarcelonaSpain
Dijana Dominis PresterUniversity of RijekaCroatia
Dragoljub GocaninUniversity of BelgradeSerbia
Dusan MandatInstitute of Physics of the Czech Academy of SciencesCzech Republic
Fabian SchüsslerIRFU / CEA Paris-SaclayFrance
Foteini OikonomouSouthern Observatory (Munich)Germany
Gabrijela ZaharijasUniversity of Nova GoricaSlovenia
Germano NardiniUniversity of StavangerNorway
Giovanni Amelino-CameliaUniversity of NaplesItaly
Günter SiglUniversität HamburgGermany
Humberto Martinez-HuertaUniversidad Autónoma de Chiapas (UNACH)Mexico
Jean-François GlicensteinIRFU, CEA Paris-SaclayFrance
Jean-Luc AtteiaIRAP, CNRS/Université de ToulouseFrance
Jelena StriškovićUniversity of RijekaCroatia
John EllisKing’s College LondonUK
José Javier RelancioUniversidad de ZaragozaSpain
José Luis CortésUniversidad de ZaragozaSpain
José Manuel CarmonaUniversidad de ZaragozaSpain
Julian SitarekUniversity of LodzPoland
Julien BolmontMontpellier UniversityFrance
Karl MannheimInstitute for Theoretical Physics and AstrophysicsGermany
Katja DzepinaUniversity of RijekaCroatia
Lucia Aurelia PopaISS (Institute of Space Science)Romania
Lukas ZehrerUniversity of Nova GoricaSlovenia
Malcolm FairbairnKing’s College LondonUK
Manel MartinezIFAE BarcelonaSpain
Marcos López MoyaUniversidad Complutense de MadridSpain
Marija ČargonjaUniversity of RijekaCroatia
Marina ManganaroUniversity of RijekaCroatia
Markus GaugUniversitat Autònoma de BarcelonaSpain
Markus GaugUniversitat Autònoma de BarcelonaSpain
Masha ChernyakovaDublin City UniversityIreland
Maykoll ReyesUniversidad de ZaragozaSpain
Michele DoroUniversity & INFN PadovaItaly
Michele RoncoLPNHEFrance
Nikolaos E MavromatosKing’s College LondonUK
Petr SatuninInstute for Nuclear Research of RAS (INR RAS), MoscowRussia
Rafael Alves BatistaRadboud UniversityNetherlands
Rodrigo Gracia RuizIPHC lab, StrasbourgFrance
Saeed RastgooYork UniversityCanada
Sami CaroffLPNHEFrance
Sidika Merve ColakIFAE BarcelonaSpain
Spyros BasilakosResearch Center for Astronomy & Applied Mathematics, Academy of Athens, and National Observatory of AthensGreece
Stefan FunkFriedrich-Alexander-University Erlangen-NuernbergGermany
Subir SarkarUniversity of OxfordUK
Tomislav TerzićUniversity of RijekaCroatia
Tsvi PiranThe Hebrew UniversityIsrael
Vasiliki MitsouIFIC (UV-CSIC)Spain
Voja RadovanovicUniversity of BelgradeSerbia