The High Energy Phenomena in Relativistic Outflows (HEPRO) conferences are a cycle of biennial events devoted to the discussion of the most recent developments, either theoretical, phenomenological, or observational, on the major themes of high-energy and multi-messenger astrophysics associated with relativistic winds and jets, on all scales.

This cycle of conferences has been spurred by Felix Aharonian, Josep Maria Paredes, and Gustavo Romero, and the previous editions were held in Dublin (2007), Buenos Aires (2009), Barcelona (2011), Heidelberg (2013), La Plata (2015), Moscow (2017) and Barcelona (2019).

The HEPRO VIII edition will be held in Paris (France), on the campus of Institut d'Astrophysique de Paris and Observatoire de Paris, from October 23 to October 26, 2023. Some specific themes that will be addressed at HEPRO VIII include the physics, dynamics and multi-wavelength signatures of jets, the production of cosmic-rays, gamma-rays and neutrinos in relativistic outflows, the environments of compact objects, the physics of relativistic sources, including pulsar wind nebulae, binary systems, gamma-ray bursts and blazars, and particle acceleration.

The sessions will be held in the main lecture hall ("Amphithéâtre") of Institut d'Astrophysique de Paris. The number of participants will be limited for logistic reasons.

The scientific program leaves ample room for oral contributions and posters, so do not hesitate to contribute!


Invited speakers


  • Mitchell Begelman (U. Colorado - Boulder, USA )
  • Andrei Beloborodov (Columbia U., USA)
  • Valentì Bosch-Ramon (U. Barcelona, Spain)
  • Zeljka Bosnjak (U. Zagreb, Croatia)
  • Jonathan Ferreira (U.Grenoble, France)
  • Eduardo Gutiérrez (Penn. State U., USA)
  • Shigeo Kimura (Tohoku U., Japan)
  • Astrid Lamberts (Obs. Nice, France)
  • Eileen Meyer (U. Maryland Baltimore County, USA)
  • Barbara Olmi (Obs. Arcetri, Italy)
  • Alexander Philippov (U. Maryland College Park)
  • Fabrizio Tavecchio (Obs. Brera, Italy)
  • Arno Vanthieghem (Princeton U., USA)
  • Frédéric Vincent (Obs. Paris, France)
  • Xiang-Yu Wang (Nanjing U., China)
  • Walter Winter (DESY Zeuthen, Germany)



Registration is now closed.

Important information: between early September and late October 2023, France will host the Rugby World Cup. The final games will take place in the Paris area on Oct. 20, 21 (semi-finals) and Oct. 27, 28 (finals). Paris may therefore be busy at this time of the year. Please make sure to book accommodation as early as possible!


Local Organizing Committee

  • Sandy Artero (IAP)
  • Frédéric Daigne (IAP)
  • Kumiko Kotera (IAP)
  • Martin Lemoine (IAP)
  • Hélène Sol (Obs. Paris-Meudon)

Scientific Organizing Committee

  • Felix Aharonian (DIAS, Ireland - MPIK, Germany)
  • Elena Amato (INAF - Osservatorio Astrofisico di Arcetri, Italy)
  • Katsuaki Asano (ICRR, U. Tokyo)
  • Marcia Branchesi (GSSI, Italy)
  • Paolo Coppi (Yale University, USA)
  • Francis Halzen (U. Wisconsin - Madison, USA)
  • Jim Hinton (MPIK, Heidelberg, Germany)
  • Martin Lemoine (IAP, France -- Chair)
  • Reshmi Mukherjee (Columbia U., USA)
  • Josep M. Paredes (Universitat de Barcelona, Spain)
  • Anita Reimer (U. Innsbruck, Austria)
  • Frank Rieger (Heidelberg U. - MPIK, Germany)
  • Gustavo Romero (IAR - FCAG, Argentina)
  • Samar Safi-Harb (U. Manitoba, Canada)
  • Hélène Sol (Obs. Paris-Meudon, France)
  • Dmitri Uzdensky (U. Colorado Boulder, USA)
  • Xiang-Yu Wang (Nanjing University, China)
  • Eli Waxman (Weizmann Inst., Israel)
  • Andreas Zech (Obs. Paris-Meudon, France)








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