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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 闕志鴻 | |
| dc.contributor.author | Ka-Hou Leong | en |
| dc.contributor.author | 梁家豪 | zh_TW |
| dc.date.accessioned | 2021-06-17T04:29:19Z | - |
| dc.date.available | 2019-08-18 | |
| dc.date.copyright | 2018-08-18 | |
| dc.date.issued | 2018 | |
| dc.date.submitted | 2018-08-13 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/70489 | - |
| dc.description.abstract | 我們利用帶有均衡紫外光背景的字宙學流體模型去模擬不同類型
暗物質模型所預測的萊曼-阿爾法森林現象，其中包括冷暗物質、波動 暗物質以及不同軸子角度的極端軸子暗物質。以極端軸子暗物質的玻 色子質量為1.1X 10^-22 電子伏的前提下，我們發現極端軸子暗物質所 預測的萊曼-阿爾法森林現象比起冷暗物質所預測的結果更能符合重 子振蕩光譜巡天計畫得到的結果，這是與[17, 1] 所預測的結果大為不 同–冷暗物質的萊曼-阿爾法森林現象較為符合觀測事實。因此，我們 的研究為暗物質是由超低質量粒子所組成的猜想帶來新的證據。 | zh_TW |
| dc.description.abstract | Using cosmological particle hydrodynamical simulations and uniform ultraviolet background, we test Lyman-alpha forest flux spectra predicted by the conventional cold dark matter (CDM) model, the free-particle wave dark matter (FPpsiDM) model and extreme-axion wave dark matter (EApsiDM) models
of different initial axion field angles against the BOSS Lyman-alpha forest absorption spectra. The boson mass mb of all DM models is fixed to mb ~ 10^-22eV. We recover the results reported previously [17, 1] that the CDM model agrees better with the BOSS data than the FPpsiDM model by a large margin, where the difference of total chi-square is 19 for 420 data bins. These previous results demand a larger boson mass by a factor > 10 and are in tension with the favoured value. However, we find this tension can be alleviated as a range of EA DM models predict Lyman- flux spectra agree better with the BOSS data than the CDM prediction by an even larger margin; the difference of total chi-square can be as large as 24. This finding is perhaps not surprising since EA DM models can have a unique spectral bump in excess of the power of CDM near the more extended spectral cutoff in the initial matter power spectrum [51, 50]. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-17T04:29:19Z (GMT). No. of bitstreams: 1 ntu-107-R03222072-1.pdf: 809028 bytes, checksum: 1c87d4e2dcfce49f1e3a5fea36159a88 (MD5) Previous issue date: 2018 | en |
| dc.description.tableofcontents | 口試委員會審定書 ii
摘要 iii Abstract v 1 Introduction 1 2 Methodology 5 2.1 Power spectra 5 2.2 Hydrodynamical simulations 7 2.3 Mock Lyman-alpha forest spectra 9 2.4 Fitting parameters 10 3 Result 13 3.1 Matter power spectrum 13 3.2 Comparison simulated Lyman-alpha flux power spectrum with BOSS data 14 4 Discussion and Conclusion 21 4.1 Discussion 21 4.2 Conclusion 22 Acknowledgements 25 Bibliography 27 | |
| dc.language.iso | zh-TW | |
| dc.subject | 星系際物質 | zh_TW |
| dc.subject | 宇宙學 | zh_TW |
| dc.subject | 暗物質 | zh_TW |
| dc.subject | cosmology | en |
| dc.subject | dark matter | en |
| dc.subject | intergalactic medium | en |
| dc.title | 利用萊曼-阿爾法吸收光譜探討極端軸子暗物質模型 | zh_TW |
| dc.title | Testing Extreme Axion Dark Matter Using BOSS Lyman
Alpha Forest Data | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 106-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 奧村哲平(Teppei Okumura),梅津敬一(keiichi umetsu),蔡岳霖 | |
| dc.subject.keyword | 宇宙學,暗物質,星系際物質, | zh_TW |
| dc.subject.keyword | cosmology,dark matter,intergalactic medium, | en |
| dc.relation.page | 33 | |
| dc.identifier.doi | 10.6342/NTU201802839 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2018-08-13 | |
| dc.contributor.author-college | 理學院 | zh_TW |
| dc.contributor.author-dept | 物理學研究所 | zh_TW |
| 顯示於系所單位： | 物理學系 | |
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