對 Kaluza-Klein 粒子作為星系團中潛在冷暗物質候選者的約束

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研究生：	李琦雅 Zuhairini Rizqiyah
論文名稱：	對 Kaluza-Klein 粒子作為星系團中潛在冷暗物質候選者的約束 Constraints on the Kaluza-Klein Particles as Potential Cold Dark Matter Candidates in Galaxy Clusters
指導教授：	黃崇源 Chorng-Yuan Hwang
口試委員:
學位類別：	碩士 Master
系所名稱：	理學院 - 天文研究所 Graduate Institute of Astronomy
論文出版年：	2023
畢業學年度：	111
語文別：	英文
論文頁數：	102
中文關鍵詞：	Kaluza-Klein 、冷暗物質、星系團、同步加速器發射、冷卻功能
外文關鍵詞：	Kaluza-Klien, Cold Dark Matter, Galaxy Clusters, Synchrotron Emission, Cooling Function
相關次數：	點閱：13 下載：0
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這項研究計算了星系團中暗物質湮滅的無線電通量密度。該研究假設這些星團中的暗物質由卡魯扎-克萊因粒子 (KKDM) 組成。 KKDM 指的是在宇宙額外維度中運動的粒子，是冷暗物質候選者之一。 KKDM 的自湮滅會導致相對論性電子-正電子對，這會在具有高磁場的星系團中產生顯著的同步輻射射電輻射。為了對這些漫射無線電發射設置下限約束，我們分析了產生費米子對的通道中的通量密度，例如 e+e-、μ+μ- 和 τ+τ-。該研究發現，如果 KKDM 是這些星團中的主要暗物質，那麼富星團（例如 Abell 119 和 Abell 2029）可能會從 KKDM 湮滅中產生可檢測的漫射無線電發射。這項研究為了解星系團中 KKDM 的特性提供了寶貴的見解，並進一步了解了宇宙學和暗物質搜索的意義。

This study calculates the radio flux density from dark matter annihilations in galaxy clusters. The research assumes that the dark matter in these clusters is composed of Kaluza-Klein particles (KKDM). KKDM refers to particles moving in the universal extra dimensions and is one of the cold dark matter candidates. Self-annihilation of KKDM could result in relativistic electron-positron pairs, which can generate significant synchrotron radio emission in galaxy clusters with high magnetic fields. To set the lower limit constraints on these diffuse radio emissions, we analyzed the flux density in channels producing fermion pairs, such as e+e-, μ+μ-, and τ+τ-. The study found that a rich cluster, such as the Abell 119 and Abell 2029 might create possible detectable diffuse radio emission from KKDM annihilation if the KKDM is the main dark matter in these clusters. This research offers valuable insights into the properties of KKDM in galaxy clusters and provides further understanding of the implications of cosmology and dark matter searches.

電子論文授權書 Authorisation of the Electronic Thesis i
指導教授推薦書 Recommendation Letter from the Thesis Advisor iii
口試委員審定書 Verification from the Oral Examination Committee v
英文摘要 Abstract in English vii
中文摘要 Abstract in Chinese viii
誌謝 Acknowledgements ix
List of Figures xiii
List of Tables xv
1 Introduction 1
2 Kaluza-Klein particles and Characteristics of clusters 5
2.1 Kaluza-Klein dark matter (KKDM) annihilations . . . . . . . . . . . . . . 5
2.2 Characteristics of Clusters . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.4 Synchrotron Emission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.4.1 Source Spectra . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.4.2 Cooling Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.4.3 Radio Emissions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.5 NVSS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.6 VLSSr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.7 Free Parameters Scan of Minimal Universal Extra Dimensions (MUEDs) . 15
3 Results and Discussions 17
3.1 Abell 119 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.2 Abell 2029 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
3.3 Abell 478 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3.4 Other Clusters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3.5 Influence of magnetic fields . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
4 Summary 39
A MadDM 47
B Upper limits constraints of target galaxy clusters 51
C Free scan parameters MUED (Minimal Universal Extra dimensions) of
target galaxy clusters 61
D Flux density on target clusters 67
E Fitting parameter on target clusters 77
                                

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