2016/05/31 by J. Hanson, Jordan C. Hanson, A. Connolly +1
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Cascade #Computer science #Factor (programming language) #Form factor (electronics) #Gamma-ray bursts and supernovae #Nuclear physics #Physics #Pulsars and Gravitational Waves Research #Radiation #astro-ph.HE
paper · pdf · doi:10.1016/j.astropartphys.2017.03.008
openalex publication_date 2017/03/30 · arxiv created 2017/04/26 · arxiv updated 2017/04/28 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The Askaryan effect describes coherent electromagnetic radiation from high-energy cascades in dense media with a collective charge. We present an analytic model of Askaryan radiation that accounts simultaneously for the three- dimensional form factor of the cascade, and quantum mechanical cascade elongation via the Landau-Pomeranchuk- Migdal effect. These calculations, and the associated open-source code, allow the user to avoid computationally intensive Monte Carlo cascade simulations. Searches for cosmogenic neutrinos in Askaryan-based detectors benefit from computational speed, because scans of Askaryan parameter-space are required to match neutrino signals. The Askaryan field is derived from cascade equations verified with Geant4 simulations, and compared with prior numerical and semi-analytic calculations. Finally, instructive cases of the model are transformed from the Fourier domain to the time-domain. Next-generation in situ detectors like ARA and ARIANNA can use analytic time- domain signal models to search for correlations with event candidates.