LHAASO discussion session organized by COST Action CA18108 on 17th June

Event: LHAASO discussion session
Date: 17th June 2021, from 9 to 13 h (CET time)


Discussion session organized by the COST Action CA18108 “Quantum gravity phenomenology in the multi-messenger approach” (https://qg-mm.unizar.es/around the revolutionary detection of 12 PeVatrons (sources of very high energy gamma-rays) that the LHAASO collaboration has recently announced (Zhen Cao, F.A. Aharonian et al., Ultrahigh-Energy Photons up to 1.4 Petaelectronvolts from 12 γ-Ray Galactic Sources, Nature 594, 7861 (2021)) and its impact, especially with respect to LIV searches (see e.g., C. Li and B.-Q. Ma, Ultrahigh-Energy Photons from LHAASO as Probes of Lorentz Symmetry Violations, arXiv:2105.07967), which is one of the key topics of research within our Action. 

– 9:00 CET: Felix Aharonian: PeVatrons, theory
– 9:45 CET: Zhen Cao: LHAASO experiment results
– 10:30 CET: Bo-Qiang Ma: LIV with LHAASO
– 11:15 CET: Free discussion

In order to receive the link to this event, please register before 16th June, 14h CET time at the following indico page:

(Action participants who have already received the link do not need to register, but accept the invitation sent from e-COST)

Workshop (WE-Heraeus-Seminar): Experimental Tests and Signatures of Modified and Quantum Gravity, 01 Feb – 05 Feb 2021

The aim of the meeting is the extend and foster the exchange between people working from theoretical and experimental side on the prediction and detection of modified and quantum gravity.

Further information can be found below and at

Two major unsolved questions in fundamental physics are related to the gravity: What is the nature of Dark Matter and Dark Energy, and, what is the theory of quantum gravity? From the theoretical point of view these questions stimulated various fundamental approaches to a theory of quantum gravity, such as string theory, loop quantum gravity, canonical quantum gravity, noncommutative geometry, asymptotic safety and others as well as phenomenological models such as doubly or deformed special relativity and the relative locality framework. Moreover, numerous classical modifications of General Relativity have been suggested such as scalar-tensor theories, f(R)-theories, bi-metric gravity, tensor-vector-scalar gravity or metric affine gravity, Poincare gauge theory, telleparallel gravity, Finsler gravity and many more.

The viability of these alternative or extended theories of gravity has to be tested by comparison of predictions with experimental data. It is important that this comparison is done on all scales from the whole universe, i.e. on cosmological scales, via galaxy-clusters, galaxies, binary systems, black holes, the solar system, satellite experiments, down to laboratory experiments at micrometer and smallest scales, i.e. high energy scales looking for new elementary particles like axions or WIMPs.
This seminar aims for discussing predictions and their comparison with experiments of extended and modified classical and quantum theories of gravity, on all scales. The goal is to identify theories, which are consistent on all scales, and, to identify observables, in which deviations of general relativity or the quantum nature of gravity is most likely to manifest itself.

Organizing Committee
Christian Pfeifer, Univeristy of Tartu, Estonia
Claus Laemmerzahl, University of Bremen, Germany