Study of Indirect Detection of Dark Matter by Cosmic-Ray Electron and Positron Observations

宇宙线电子和正电子观测间接探测暗物质的研究

• 批准号: 18540293
• 负责人: YOSHIDA Kenji
• 金额: $ 2.46万
• 依托单位: Shibaura Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2006
• 资助国家: 日本
• 起止时间: 2006 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18540293/
• 关键词: Cosmic Ray Electron; Dark Matter; 宇宙線陽電子; 宇宙線; 電子

It has been pointed out in particle physics that mono-energetic electrons and positrons can be produced in the annihilation of WIMP dark matter such as neutralino of the lightest stable supersymmetric particle and Kaluza-Kein particle of universal extra dimension models. In this study, I considered the possibility of the indirect observations of dark matter by the detection of these electrons. The energy spectrum and arrival directions of electrons and positrons in the energy range above 100GeV is crucial to detect electron-positron pairs from WIMP annihilations. However, there are few observations for the energy spectrum and no observations for the arrival directions. Since we have observed cosmic-ray electrons from 100GeV to 1TeV with PPB-BETS in Antarctica, from the analysis of the data sets of PPB-BETS, I derived the energy spectrum and arrival directions of electrons in the energy range of 〜100GeV to 〜1TeV. Although the observed electron spectra might have a hump in the region of sub-TeV, the amount of statistics of the electron and positron observations are insufficient to discuss the details of the contribution of WIMP dark matter. In order to increase the greatly the amount of statistics, it is required to observe the high-energy electrons and positrons for much longer exposure times by space utilization such as CALET on the ISS. Hence, I simulated the energy spectrum of electrons and gamma rays from WIMP dark matter annihilations observed with CALET. The simulated results suggest that a high precise measurement of the electrons enable us to detect distinctive features from WIMP dark matter annihilations in the Galactic halo.

粒子物理学已经指出，在WIMP暗物质的湮灭过程中可以产生单能电子和正电子，如最轻的稳定超对称粒子的中性伴子和普遍的额外维模型的Kaluza-Kein粒子。在这项研究中，我考虑了通过探测这些电子来间接观测暗物质的可能性。在100 GeV以上的能量范围内，电子和正电子的能谱和到达方向对于探测WIMP湮灭中的电子-正电子对是至关重要的。然而，有几个观测的能量谱和没有观测的到达方向。由于我们在南极用PPB-BETS观测到了100 GeV ~ 1 TeV的宇宙线电子，通过对PPB-BETS数据集的分析，推导出了100 GeV ~ 101 TeV能量范围内电子的能谱和到达方向。虽然观测到的电子能谱可能在亚TeV区域有一个驼峰，但电子和正电子观测的统计量不足以讨论WIMP暗物质贡献的细节。为了大大增加统计量，需要通过空间利用（例如国际空间站上的CALET）对高能电子和正电子进行更长曝光时间的观测。因此，我模拟了CALET观测到的WIMP暗物质湮灭的电子和伽马射线的能谱。模拟结果表明，高精度的电子测量使我们能够检测到银河系晕中的WIMP暗物质湮灭的独特特征。

项目成果

CALETの開発X:CALETによる電子,ガンマ線観測の概要

CALETX的开发：CALET的电子和伽马射线观测概述

• 发表时间: 2007
• 期刊: 第7回 宇宙科学シンポジウム集録
• 作者: 吉田 健二;他JEM-CALET WG
• 通讯作者: 他JEM-CALET WG

宇宙線電子観測による宇宙線の起源,加速,伝播機構の解明

通过宇宙线电子观测阐明宇宙线的起源、加速和传播机制

• 发表时间: 2006
• 作者: K.;Yoshida;吉田 健二
• 通讯作者: 吉田 健二

for JEM-CALET WG, Development of CALET X : Observations of electrons and gamma-rays with CALET

JEM-CALET WG，CALET X 的开发：使用 CALET 观测电子和伽马射线

• 发表时间: 2007
• 期刊: Proc. of the 7th Space Science Symposium
• 作者: K.;Yoshida
• 通讯作者: Yoshida

High-Energy Cosmic-Ray Electrons in the Galaxy(招待講演)

银河系中的高能宇宙线电子（特邀报告）

• 发表时间: 2006
• 作者: K.;Yoshida;K.Yoshida
• 通讯作者: K.Yoshida

High-energy cosmic-ray electrons in the Galaxy

• DOI: 10.1016/j.asr.2007.03.060
• 发表时间: 2008-08
• 期刊: Advances in Space Research
• 影响因子: 2.6
• 作者: K. Yoshida