DeCAF Seminar Series:

Abstract: The origins of the most energetic particles in the Universe have been a long-standing puzzle. In the quest to identify their sources, it is crucial to understand how these particles are accelerated, how they escape their production sites, and which paths they take on their journey to Earth. The multi-messenger framework has proven to be a powerful tool for exploring the Universe at these extreme energies. In this talk, I will focus on the triad of (ultra-)high-energy messengers: cosmic rays, neutrinos, and gamma rays. I will begin with a summary of the state of affairs of the field, reviewing some key theoretical developments and recent experimental results. I will then explore the essential components required for building theoretical models that explain these observations. Particular emphasis will be placed on modelling the propagation of these messengers, including their interactions with matter and radiation fields, as well as with the poorly understood cosmic magnetic fields. Finally, I will discuss the prospects for constructing a unified and self-consistent model of the Universe at ultra-high energies and the implications such a model would have for astrophysics, cosmology, and fundamental physics.

Speaker Bio: junior professor at the Institut d'Astrophysique de Paris, Sorbonne Universite. He was previously a La Caixa Junior Leader in Madrid, and held postdoctoral positions in Nijmegen, Oxford, and Sao Paulo. He obtained his PhD from the University of Hamburg. His work spans a variety of topics in astroparticle physics, high-energy astrophysics, and fundamental physics, encompassing theory and experiment, with emphasis on building theoretical and computational models for gamma rays, cosmic rays, and neutrinos.