2010 Fiscal Year Final Research Report
Search for B-modes in CMB polarization with Multi-Frequency Observation
| Project/Area Number |
20740158
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | High Energy Accelerator Research Organization |
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Principal Investigator |
TAJIMA Osamu High Energy Accelerator Research Organization, 素粒子原子核研究所, 准教授 (80391704)
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| Project Period (FY) |
2008 – 2010
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| Keywords | インフレーション宇宙 / 原始重力波 / 宇宙背景放射 / 偏光 |
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| Research Abstract |
B-modes, faint polarization pattern in Cosmic Microwave Background (CMB) is smoking gun signature of inflationary universe. We searched B-modes with QUIET experiment which is ground-based CMB polarization telescope. Based on 40GHz band data, we obtained the second best upper limits for B-modes. We also have evidence for foreground (Galaxy emission) contamination in one of our four observation fields. Understanding of the foreground contamination is the important in future. Since we already have 90GHz band observation data in addition to the 40GHz band data, we have prospects to obtain the world best B-modes limits with combined results for both bands.
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