A GPU-based Calculation Method for Near Field Effects of Cherenkov Radiation Induced by Ultra High Energy Cosmic Neutrinos

TL;DR

This paper introduces a GPU-accelerated finite-difference time-domain method for accurately calculating near-field Cherenkov radiation signals from ultra-high energy cosmic neutrino-induced particle showers, overcoming limitations of traditional approximations.

Contribution

It presents a novel FDTD-based calculation approach optimized with GPU acceleration for near-field Cherenkov signal modeling in ultra-high energy neutrino detection.

Findings

Efficient GPU-accelerated computation of Cherenkov pulses in near field.

Accurate modeling of electromagnetic showers induced by neutrinos.

Improved understanding of radio signals from ultra-high energy cosmic neutrinos.

Abstract

The radio approach for detecting the ultra-high energy cosmic neutrinos has become a mature field. The Cherenkov signals in radio detection are originated from the charge excess of particle showers due to Askaryan effect. The conventional way of calculating the Cherenkov pulses by making Fraunhofer approximation fails when the sizes of the elongated showers become comparable with the detection distances. We present a calculation method of Cherenkov pulses based on the finite-difference time-domain (FDTD) method, and attain a satisfying effeciency via the GPU- acceleration. Our method provides a straightforward way of the near field calculation, which would be important for ultra high energy particle showers, especailly the electromagnetic showers induced by the high energy leptons produced in the neutrino charge current interactions.