International Research Fellowship Program: High Precision Measurement of the Polarization Anisotropy of the Cosmic Microwave Background Radiation
国际研究奖学金计划:宇宙微波背景辐射偏振各向异性的高精度测量
基本信息
- 批准号:0402098
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:美国
- 项目类别:Fellowship
- 财政年份:2004
- 资助国家:美国
- 起止时间:2004-09-01 至 2006-06-30
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
0402098JohnsonThe International Research Fellowship Program enables U.S. scientists and engineers to conduct three to twenty-four months of research abroad. The program's awards provide opportunities for joint research, and the use of unique or complementary facilities, expertise and experimental conditions abroad.This award will support a twenty-two month research fellowship by Dr. Bradley R. Johnson to work with Dr. Walter Gear at the University of Wales in Cardiff.Recent measurements of the temperature anisotropy of the cosmic microwave background radiation (CMB) from experiments like MAXIMA and WMAP suggest we live in a universe whose evolution is described by adiabatic inflationary cosmology dominated by cold dark matter and a cosmological constant. Given this fact, the CMB should be partially linearly polarized with the vector field on the sky consisting of a curl-free (E-mode) component and a divergence-free (B-mode) component. The E-mode component was predominantly produced by bulk motion in the primordial plasma at recombination arising from scalar perturbations; the B-mode component was produced by tensor perturbations resulting from inflationary gravity waves. A measurement of the angular power spectrum of the primordial B-mode polarization will yield the energy scale of inflation. B. R. Johnson is working as part of the Instrumentation Group at the University of Wales, Cardiff to develop polarimetric instrumentation for making high precision measurements of the polarization of the CMB. This instrument will be specifically designed to characterize the anticipated B-mode signals. The primordial B-mode signal is extremely faint and therefore difficult to detect. Likely instrument designs will employ hundreds of photon noise limited 300 mK bolometric detectors, a ~2 m reflecting telescope large enough to provide ~5 arcmin resolution at 150 GHz, and polarization modulation hardware. Once constructed, integrated and deployed, the experiment will be map ~500 square degree regions of the sky from Antarctica at Dome C where the millimeter-wave emission of the atmosphere is minimized.
0402098约翰逊国际研究奖学金计划使美国科学家和工程师能够在国外进行三到二十四个月的研究。该计划的奖项提供了联合研究的机会,以及使用独特或互补的设施,专业知识和国外的实验条件。约翰逊与威尔士大学卡迪夫的沃尔特·吉尔博士合作。最近对宇宙微波背景辐射(CMB)温度各向异性的测量表明,我们生活在一个由绝热暴胀宇宙学描述的宇宙中,该宇宙学由冷暗物质和宇宙学常数主导。鉴于这一事实,CMB应该是部分线性偏振的,天空上的矢量场由无卷曲(E模式)分量和无发散(B模式)分量组成。E模分量主要是由原始等离子体中的体运动在标量扰动引起的重组产生的; B模分量是由暴胀引力波引起的张量扰动产生的。测量原始B模式偏振的角功率谱将产生暴胀的能量标度。B。R.约翰逊是威尔士大学卡迪夫的仪器组的一部分,致力于开发用于高精度测量CMB偏振的偏振测量仪器。该仪器将专门设计用于表征预期的B模式信号。原始B模式信号非常微弱,因此难以检测。可能的仪器设计将采用数百个光子噪声限制的300 mK测辐射热探测器,一个~2米的反射望远镜,足以在150 GHz提供~5弧分的分辨率,和偏振调制硬件。一旦建造,集成和部署,该实验将在Dome C从南极洲绘制约500平方度的天空区域,其中大气的毫米波发射最小化。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Bradley Johnson其他文献
Modifiable and nonmodifiable factors associated with patient satisfaction in spine surgery and other orthopaedic subspecialties: A retrospective survey analysis
与脊柱手术和其他骨科亚专科患者满意度相关的可修改和不可修改因素:回顾性调查分析
- DOI:
- 发表时间:
2019 - 期刊:
- 影响因子:0.3
- 作者:
Leah M. Steinmetz;Dennis Vasquez;Bradley Johnson;A. Buckland;J. Goldstein;J. Bendo;T. Errico;C. Fischer - 通讯作者:
C. Fischer
Cardiac magnetic resonance impacts pregnancy delivery plans: A case series
心脏磁共振影响妊娠分娩计划:病例系列
- DOI:
10.1016/j.jocmr.2024.101191 - 发表时间:
2025-03-01 - 期刊:
- 影响因子:6.100
- 作者:
Makenzie Whalen;Scott Cohen;Stacy Leibham;Salil Ginde;Matthew Buelow;Bradley Johnson;Peter Bartz;Jennifer Gerardin - 通讯作者:
Jennifer Gerardin
Clinical trial data-sharing policies among journals, funding agencies, foundations, and other professional organizations: a scoping review
期刊、资助机构、基金会和其他专业组织之间的临床试验数据共享政策:范围审查
- DOI:
10.1016/j.jclinepi.2022.11.009 - 发表时间:
2023-02-01 - 期刊:
- 影响因子:5.200
- 作者:
Austin L. Johnson;J. Michael Anderson;Max Bouvette;Israel Pinero;Shelby Rauh;Bradley Johnson;Micah Kee;Benjamin Heigle;Andrea C. Tricco;Matthew J. Page;Patti McCall Wright;Matt Vassar - 通讯作者:
Matt Vassar
CORONARY ARTERY DISEASE SCREENING IN ADULTS WITH CONGENITAL HEART DISEASE PRIOR TO CARDIAC SURGERY
- DOI:
10.1016/s0735-1097(18)31092-1 - 发表时间:
2018-03-10 - 期刊:
- 影响因子:
- 作者:
Bradley Johnson;Matt Buelow;Peter Bartz;Scott Cohen;Michael Earing;Salil Ginde - 通讯作者:
Salil Ginde
MACROVOLT TWAVE ALTERNANS: A FOREBODING SIGN FOR VENTRICULAR ARRHYTHMIA IN SEVERE SYSTEMIC ILLNESS
- DOI:
10.1016/s0735-1097(20)33320-9 - 发表时间:
2020-03-24 - 期刊:
- 影响因子:
- 作者:
David Soma;Bradley Johnson;Andrew Rosenblum - 通讯作者:
Andrew Rosenblum
Bradley Johnson的其他文献
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{{ truncateString('Bradley Johnson', 18)}}的其他基金
Collaborative Research: Scalable Kilo-Pixel Detector Modules Based on Polarization Sensitive Multi-Chroic Aluminum Manganese MKIDs
合作研究:基于偏振敏感多色铝锰 MKID 的可扩展千像素探测器模块
- 批准号:
2019531 - 财政年份:2020
- 资助金额:
-- - 项目类别:
Standard Grant
Collaborative Research: Scalable Kilo-Pixel Detector Modules Based on Polarization Sensitive Multi-Chroic Aluminum Manganese MKIDs
合作研究:基于偏振敏感多色铝锰 MKID 的可扩展千像素探测器模块
- 批准号:
1711160 - 财政年份:2017
- 资助金额:
-- - 项目类别:
Standard Grant
Collaborative Research: Polarization Sensitive Multi-Chroic MKIDs
合作研究:偏振敏感多色 MKID
- 批准号:
1509211 - 财政年份:2015
- 资助金额:
-- - 项目类别:
Standard Grant
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