COST CA18108 Workshop on theoretical and experimental advances in quantum gravity, Belgrade (Serbia), 1-3 September 2022

The Workshop on theoretical and experimental advances in quantum gravity organised by our COST Action will take place in Belgrade (Serbia), from 1st to 3rd September 2022. Registration is open.

COST CA18108 Review paper on Quantum Gravity Phenomenology published in Progress in Particle and Nuclear Physics

The review paper “Quantum gravity phenomenology at the dawn of the multi-messenger era—A review”, prepared within the COST Action CA18108, has been published in

Progress in Particle and Nuclear Physics
Volume 125, July 2022, 103948

The final version of the article with full bibliographic details is now available online at:

The article is being published open access, so that access to the full article is not restricted in any way.

COST CA18108 2nd Training School in Belgrade (Serbia), 3-10 September 2022

Our 2nd Training School will take place in Belgrade, Serbia, from the 3rd (starting in the afternoon) to the 10th September 2022. Registration is open at the website of the School:
where you can find additional information about the organization of the school.
We encourage the participation of PhD students and young postdocs with either theoretical or experimental background, since one of the objectives of the Action is the training of young researchers in theoretical models and experimental techniques in order to build a new scientific profile that will combine the relevant skills and a transversal background in the fields of astrophysics and quantum gravity.

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” ( 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)

CA18108 Action participants receive prize in the Gravity Research Foundation essay competition

We are proud to announce that the essay “Quantum Gravity Phenomenology in the Infrared”, (arXiv:2104.00802 [gr-qc]), which contributes to our COST CA18108 Action, has won the second prize in the Gravity Research Foundation essay competition.

Congratulations to the authors! From left to right in the photograph: Laurent Freidel (Perimeter Institute for Theoretical Physics, Canada), Jerzy Kowalski-Glikman (University of Wroclaw, Poland), Robert G. Leigh (University of Illinois, USA), and Djordje Minic (Virginia Tech, USA).

Action participants receive prize by the journal Universe within its Best Papers Awards 2015-2021


Action participants Diego Rubiera-García (UCM, Madrid, left photograph) and Gonzalo Olmo (IFIC, Valencia, right photograph) are among the winners of the Universe 2021 Best Paper Awards. The journal has selected their paper

Nonsingular Black Holes in ƒ (R) Theories
By: Gonzalo J. Olmo and Diego Rubiera-Garcia
Universe 20151(2), 173–185

as one of the three winning papers, after a thorough evaluation of the originality and significance of the papers, citations, and downloads.

The authors explain about their work:

“The paper Nonsingular Black Holes in ƒ(R) Theories studies the structure of a family of static, spherically symmetric space-times generated by an anisotropic fluid and governed by a quadratic ƒ(R) theory. We found solutions that represent black holes with the central singularity replaced by a finite size wormhole, and showed that time-like geodesics and null geodesics with nonzero angular momentum never reach the wormhole throat due to an infinite potential barrier. For null radial geodesics, it takes an infinite affine time to reach the wormhole. This means that the resulting space-time is geodesically complete and, therefore, nonsingular despite the generic existence of curvature divergences at the wormhole throat.”

Our congratulations to both researchers!

New MC observers from Georgia Institute of Technology, USA, join CA18108

The Management Committee of CA18108 has approved the participation of  Prof Adam Nepomuk Otte and the PhD student Mr Alasdair Gent as MC Observers from Georgia Institute of Technology, USA. A description of the request can be found here. The complete international structure of COST Action CA18108 can be seen at this page in our website.

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

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