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

#### Contacts

**Group Leader:** Armando di Matteo (INFN Torino, Turin, Italy)**Group Vice-Leader:** Günter Sigl (University of Hamburg, Germany)

#### 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.

#### Tasks

- Tackle the problem of the possibility of observing quantum gravity (QG) effects in the propagation of ultra-high-energy cosmic rays (UHECRs), given the experimental observation of a high-energy suppression in the all-particle spectrum
- Consider the implications of QG phenomenology in the extragalactic electromagnetic cascades produced in the propagation of UHECRs, clarifying the different implications of Lorentz invariance violation (LIV) and deformed special relativity (DSR) frameworks
- Study the effects of QG phenomenology on the production processes of UHECRs, also relating the observed spectrum with that of the (possible) associated messengers (e.g. neutrinos and gamma rays)
- Consider the possibility of deriving limits for LIV and DSR parameters from the modifications in the development of the extensive air showers initiated by high-energy cosmic rays in the Earth’s atmosphere, also relating these effects to the excess of muons in observed air showers as compared to simulations.

#### Milestones

**Year 1:**Review, improve and update the already existing searches for quantum gravity signatures through cosmic rays measurements.**Year 2:**Constrain QG phenomenology from the available experimental data in the different cases of LIV and DSR.**Year 3:**Definition of new analysis strategies taking into account the theoretical frameworks developed in WG1 and WG2.**Year 4:**Development of multi-messenger search strategies based on the phenomenological models developed by WG1 and WG2.

#### Joint WG3-WG4-WG5-WG6 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

#### Members

Name | Institution | Country |
---|---|---|

Andrea Addazi | INFN Roma 2 | Italy |

Andrea Maino | Università Statale di Milano | Italy |

Antonino Marcianò | INFN Frascati LNF | Italy |

Armando di Matteo | INFN Turin | Italy |

Bo-Qiang Ma | Peking University | China |

Caterina Trimarelli | University of L’Aquila | Italy |

Danilo Zavrtanik | University of Nova Gorica | Slovenia |

Denise Boncioli | University of L’Aquila | Italy |

Deniz Sunar Cerci | Adiyaman University | Turkey |

Dusan Mandat | Institute of Physics of the Czech Academy of Sciences | Czech Republic |

Enrique Zas | Instituto Galego de Física de Altas Enerxías (IGFAE) | Spain |

Fabian Schüssler | IRFU / CEA Paris-Saclay | France |

Federico Urban | CEICO, Institute of Physics (FZU), Prague | Czech Republic |

Foteini Oikonomou | Southern Observatory (Munich) | Germany |

Francesco Salamida | University of L’Aquila and INFN LNGS | Italy |

Francisco Pedreira Giralda | Instituto Galego de Física de Altas Enerxías (IGFAE) | Spain |

Germano Nardini | University of Stavanger | Norway |

Giovanni Amelino-Camelia | University of Naples | Italy |

Günter Sigl | Universität Hamburg | Germany |

Humberto Martinez-Huerta | Universidad Autónoma de Chiapas (UNACH) | Mexico |

Jaime Alvarez Muñiz | Instituto Galego de Física de Altas Enerxías (IGFAE) | Spain |

José Ignacio Illana | University of Granada | Spain |

José Javier Relancio | Universidad de Zaragoza | Spain |

José Luis Cortés | Universidad de Zaragoza | Spain |

José Manuel Carmona | Universidad de Zaragoza | Spain |

Julien Bolmont | Montpellier University | France |

Karl-Heinz Kampert | Bergische Universität Wuppertal | Germany |

Lino Miramonti | Milano University and INFN | Italy |

Lorenzo Caccianiga | Istituto Nazionale di Fisica Nucleare – Sezione di Milano | Italy |

Lukas Zehrer | University of Nova Gorica | Slovenia |

Malcolm Fairbairn | King’s College London | UK |

Marco Torri | University of Milan | Italy |

Marcus Niechciol | Universität Siegen | Germany |

María Dolores Rodríguez Frías | Universidad de Alcalá de Henares | Spain |

Markus Risse | University of Siegen | Germany |

Maykoll Reyes | Universidad de Zaragoza | Spain |

Nikolaos E Mavromatos | King’s College London | UK |

Oleg Kalashev | Institute for Nuclear Research RAS, Moscow | Russia |

Petr Tinyakov | Universite Libre de Bruxelles | Belgium |

Rafael Alves Batista | Radboud University | Netherlands |

Roberto Aloisio | Gran Sasso Science Institute | Italy |

Rodrigo Gracia Ruiz | IPHC lab, Strasbourg | France |

Salim Cerci | Adiyaman University | Turkey |

Sorin Ion Zgura | ISS (Institute of Space Science) | Romania |

Stefan Funk | Friedrich-Alexander-University Erlangen-Nuernberg | Germany |

Vlad Popa | ISS (Institute of Space Science) | Romania |

#### Talks at CA18108 meetings

### October 2019 Barcelona workshop

- Review Talk WG5 – Cosmic rays (A. di Matteo)
- Pierre Auger Observatory (F. Salamida)
- Telescope Array (A. di Matteo)

#### Related works

(please contact the working group leader if you want yours listed)

- R. Aloisio et al. (2000), Probing the structure of space-time with cosmic rays [arXiv]
- G. Amelino-Camelia and T. Piran (2000), Planck scale deformation of Lorentz symmetry as a solution to the UHECR and the TeV gamma paradoxes [arXiv]
- F.R. Klinkhamer and M. Risse (2008), Ultrahigh-energy cosmic-ray bounds on nonbirefringent modified-Maxwell theory [arXiv] (addendum [arXiv])
- L. Maccione et al. (2009), Planck-scale Lorentz violation constrained by Ultra-High-Energy Cosmic Rays [arXiv]
- S.T. Scully and F.W. Stecker (2009), Lorentz invariance violation and the observed spectrum of ultrahigh energy cosmic rays [arXiv]
- A. Saveliev et al. (2011), Lorentz Invariance Violation and Chemical Composition of Ultra High Energy Cosmic Rays [arXiv]
- D. Boncioli et al. (ICRC 2015), Future prospects of testing Lorentz invariance with UHECRs [arXiv]
- J.S. Díaz, F.R. Klinkhamer and M. Risse (2016), Changes in extensive air showers from isotropic Lorentz violation in the photon sector [arXiv]
- F.R. Klinkhamer et al. (2017), Improved bound on isotropic Lorentz violation in the photon sector from extensive air showers [arXiv]
- D. Boncioli [for the Pierre Auger collab.] (ICRC 2017), Probing Lorentz symmetry with the Pierre Auger Observatory [arXiv]
- H. Martínez-Huerta and A. Pérez-Lorenzana (ICRC 2017), Effects of Lorentz invariance violation on cosmic ray photon emission and gamma ray decay processes [arXiv]
- L.A. Anchordoqui and J.F. Soriano (2018), New test of Lorentz symmetry using ultrahigh-energy cosmic rays [arXiv]
- R.G. Lang, H. Martínez-Huerta and V. de Souza (2018), Limits on the Lorentz Invariance Violation from UHECR astrophysics [arXiv]
- M.D.C. Torri et al. (2018), Lorentz Invariance Violation effects on UHECR propagation: A geometrized approach [arXiv]
- R.G. Lang [for the Pierre Auger collab.] (ICRC 2019), Testing Lorentz Invariance Violation at the Pierre Auger Observatory [arXiv]