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| ???org.dspace.app.webui.jsptag.ItemTag.dcfield??? | Value | Language |
|---|---|---|
| dc.contributor.advisor | 朱有花(You-Hua Chu) | |
| dc.contributor.author | Ming-Feng Ho | en |
| dc.contributor.author | 何銘峰 | zh_TW |
| dc.date.accessioned | 2021-06-17T03:24:31Z | - |
| dc.date.available | 2018-06-21 | |
| dc.date.copyright | 2018-06-21 | |
| dc.date.issued | 2018 | |
| dc.date.submitted | 2018-06-04 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/69704 | - |
| dc.description.abstract | 宇宙微波背景輻射紀錄了宇宙的歷史，而宇宙的歷史也藉由微波背景的頻譜圖被 揭露。甚至對小片天區，頻譜圖的偏移也顯露了小片天區的訊息，如重力透鏡效 應、都卜勒增強效應、或者其他未知的效應。在分析隨機選擇的普朗克微波背景 小片天區時，我們建立了聲峰偏移的全天球特徵圖（feature map），這提供了我們 對全天球宇宙學研究的新途徑。在聲峰特徵圖中，我們發現了不少區域的聲峰有 往大尺度偏移的現象，也包括了著名的冷斑（Cold Spot）區域。在做聲峰圖的多 極展開時，與模擬相比，我們聲峰圖的偶極明顯大於大部分的模擬。另外，我們 還發現了這個偶極與 SDSS-II/SNLS3 超新星的距離殘差有空間相關性。這個相關 性可能顯示了膨脹在偶極方向上有變化性。 | zh_TW |
| dc.description.abstract | Cosmic microwave background (CMB) temperature anisotropies encode the history of the universe, which manifest itself in the angular power spectrum. Variations in the power spectra even from small patches reveal informative details such as gravitational lensing, Doppler boosting effects, or even unknown effect. In doing data mining from ESA Planck CMB map, we compute the relative shifts of acoustic peak positions in power spectra from small patches and construct a full-sky peak-shift feature map, which provides a new way for statistics of full-sky cosmology. We found significant strong global dipole signal compared with simulations. The direction of the dipole, furthermore, spatially correlates with residuals of supernovae distances from best-fit ΛCDM cosmology in SDSS-II/SNLS3 Joint Light-Curve Analysis data. This correlation might indicate the variations of the expansion on the peak-shift dipole direction. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-17T03:24:31Z (GMT). No. of bitstreams: 1 ntu-107-R04244007-1.pdf: 12518252 bytes, checksum: 6fcde87dcdc3ed7766d937029a861c9c (MD5) Previous issue date: 2018 | en |
| dc.description.tableofcontents | 1 Introduction 1
1.1 Background:Cosmology ......................... 2 1.2 What is a Feature Map? ......................... 3 1.3 Analysis Setup .............................. 5 1.4 Thesis Overview ............................. 5 2 Data & Background 7 2.1 Overview ................................. 7 2.2 Planck CMB Maps ............................ 7 2.3 Selection of Patches............................ 9 2.3.1 Independent Patches....................... 9 2.3.2 Randomly Placed Patches .................... 12 2.4 Measurements of Peak Shifts....................... 13 2.4.1 Power Spectrum Extraction ................... 13 2.4.2 Non-Linear Fitting with Four Gaussians . . . . . . . . . . . . 14 2.4.3 Univariate Peak-Shift Features ................. 16 3 Healpix as a 2D Spherical Histogram 19 3.1 WISE-2MASS Galaxy Density Map................... 20 3.2 Acoustic Peak-Shift Map......................... 22 4 Results 27 4.1 The Result of Independent Patches & I Feature Maps . . . . . . . . 28 4.2 Areas with Peak Shifts Toward Large Scales . . . . . . . . . . . . . . 34 4.3 Full-sky Correlation between WISE-2MASS Density Map and I Feature Map ................................. 35 4.4 Dipole Analysis.............................. 42 4.5 Linear Regression on Distance Residuals and the Peak-Shift Dipole 44 5 Discussion 49 A Non-Periodic Boundary 51 B Supplementary Results 53 C Application: A Simple Solution for CNN on Spheres – Using Hierarchical Spherical Data 55 Bibliography 61 | |
| dc.language.iso | en | |
| dc.title | 小天區的全天球聲峰偏移 | zh_TW |
| dc.title | Full-Sky Acoustic Peak Shifts from Patches | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 106-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.coadvisor | 蔣龍毅(Lung-Yih Chiang) | |
| dc.contributor.oralexamcommittee | 後藤友嗣(Tomotsugu Goto),劉國欽(Guo-Chin Liou) | |
| dc.subject.keyword | 大尺度結構,觀測宇宙學,微波背景,資料分析, | zh_TW |
| dc.subject.keyword | large scale structure of the universe,cosmology: observation,cosmic microwave background,data analysis, | en |
| dc.relation.page | 65 | |
| dc.identifier.doi | 10.6342/NTU201800867 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2018-06-04 | |
| dc.contributor.author-college | 理學院 | zh_TW |
| dc.contributor.author-dept | 天文物理研究所 | zh_TW |
| Appears in Collections: | 天文物理研究所 | |
Files in This Item:
| File | Size | Format | |
|---|---|---|---|
| ntu-107-1.pdf Restricted Access | 12.22 MB | Adobe PDF |
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