2025/04/11(Fri) 11:00 -12:15 五樓第一會議室 5F, 1st Meeting Room
Title
Towards an air shower profile reconstruction of high-energy cosmic rays using dense radio antenna arrays
Speaker
Mr. Keito Watanabe (Institute for Astroparticle Physics, Karlsruhe Institute of Technology)Abstract
Understanding the origin of high-energy cosmic rays (E > 10^16 eV) has been an ongoing challenge since their initial discovery in 1912. Through reconstruction of parameters describing the extensive air showers generated through interaction of cosmic rays in the Earth’s atmosphere, we are now able to determine their energy and arrival direction with high accuracy. However, the mass composition of the cosmic ray, which is a valuable piece in uncovering the origin of high-energy cosmic rays, is not yet well constrained. In particular, current reconstruction frameworks can only recover shower parameters the mass composition which rely heavily on hadronic interaction models with computationally expensive simulations. As such, developing new analysis approaches to reconstruct the full air shower profile, which contains all information necessary to understand its properties (energy, arrival direction, mass composition), is ever more so crucial. In this work, we develop a novel framework to reconstruct the longitudinal profile of air showers using radio measurements from dense radio antenna arrays. Such antenna arrays are ideal instruments to explore the potential of air shower profile reconstruction due to its high antenna density that allows for cosmic ray observations with unprecedented accuracy. We explicitly incorporate our current physical understanding of air showers to model the profile and leverage on a novel fast-forward model based on template synthesis to describe the radio emission of the air shower. Our reconstruction framework relies on Information Field Theory (IFT), a state-of-the-art Bayesian statistical framework that is not only able to exploit all information available within the signal at each antenna position simultaneously but can also reconstruct the full profile with uncertainties in each bin. Through our framework, we demonstrate that radio measurements from dense antenna layouts have the capability to go beyond reconstruction of standard shower parameters which will further our understanding of cosmic ray air showers.
Language
演講語言 (Language): in English