The "Action Thématique Phénomènes Extrêmes et Multi-messagers" (AT-PEM, formerly PNHE) has been an INSU thematic action since 2011 and is also supported by IN2P3, INP, CNES, and CEA/IRFU.
Rationale:
Multi-messenger astrophysics has opened unprecedented windows onto extreme astrophysical phenomena. Processing and interpreting these observations require increasingly sophisticated models capable of bridging vast spatial and temporal scales, coupling complex physical processes, and exploiting modern high-performance computing architectures.
The 2026 edition of the AT-PEM days aims to highlight these challenges by bringing together observers, theorists, and numerical modelers to discuss the tools and approaches used within the High-Energy Astrophysics community in France.
A key objective of the meeting is to foster discussion across communities, identify current limitations of existing approaches, and outline future directions for numerical modeling.
Structure:
The event will be structured around five broadly defined themes, each corresponding to one full session:
- Transport and diffuse backgrounds,
- Relativistic jets,
- Supernovae,
- Accreting black holes,
- Magnétospheres.
Each session will start with a one-hour invited observational review talk, followed by a series of invited, contributed, and flash talks, and a concluding session, all focusing on numerical aspects of the topic.
Practical informations:
- Registration required (free)
- In person
- Start: 18 November 2026 at 2 PM
- End: 20 November 2026 at 5 PM
- Location: Amphithéâtre Charpak, Sorbonne Université, campus Jussieu, Paris
Organizing Committee: Arno Vanthieghem (LUX, arno.vanthieghem@obspm.fr), Benoît Cerutti (IPAG), Astrid Lamberts (OCA), Alexandre Marcowith (LUPM), Pierre-Olivier Petrucci (IPAG), Peggy Varnière (APC), Cristina Volpe (APC)