表題番号:2017B-162 日付:2018/04/09
研究課題Numerical Calculation of Cosmic Ray Anisotropy
研究者所属(当時) 資格 氏名
(代表者) 理工学術院 創造理工学部 助教 モッツ ホルガー マルティン
(連携研究者) 理工学術院 先進理工学研究科 PhD Student Bhattacharyya Saptashwa
研究成果概要
This research project advanced the scientific analysis of data from the CALET cosmic-ray detector on the ISS with regard to anisotropy of the flux and signatures of Dark Matter Annihilation and decay. Using numerical simulation, reference models for the interpretation of the CALET data are created.
The anisotropy of the cosmic ray electron+positron flux measured with CALET was analyzed, confirming the reliability of the analysis methods previously tested on Monte Carlo simulations.
On the field of indirect Dark Matter search, limits on Dark Matter annihilation and decay were calculated from published CALET data.  A weak hint at what could be a signature of Dark Matter annihilation or decay was studied, since additional flux from Dark Matter was found to slightly better model a step structure in the spectrum than the power-law background from astrophysical sources alone.
Furthermore,  leptonic three-body decay of Dark Matter as the sole cause of the positron excess was investigated. It was shown that a parameter space both for this Dark Matter model, as well as the single-pulsar model exists with current CALET data, but that the two cases could be separated with full statistics of  5-year CALET data.