Probing the Cosmic Dawn and Epoch of Re-ionization with REACH

利用 REACH 探索宇宙黎明和再电离时代

基本信息

  • 批准号:
    ST/V004425/1
  • 负责人:
  • 金额:
    $ 88.83万
  • 依托单位:
  • 依托单位国家:
    英国
  • 项目类别:
    Fellowship
  • 财政年份:
    2022
  • 资助国家:
    英国
  • 起止时间:
    2022 至 无数据
  • 项目状态:
    未结题

项目摘要

The Big Bang model for the origin and initial evolution of the Universe is by now a familiar and well-studied research field. The subsequent, late time, evolution of stars and other celestial objects over billions of years is perhaps even better understood. Less is known, however, about the time between these periods (from about 0.35 to 1 billion years after the Big Bang). During this time the Universe transitioned from being a vast volume filled with a cooling neutral gas to become the realm of cosmic objects that we can now observe from Earth.At the beginning the Universe was filled with a hot, dense fog of ionized gas until the continued expansion and cooling allowed electrons and protons to combine and form the first neutral atoms, eg. hydrogen. Eventually, the neutral matter clumped together under the effects of gravity, providing the conditions for nuclear fusion to occur, leading to the birth of the first stars and galaxies (period known as the Cosmic Dawn). Subsequently, these objects heated and re-ionised the surrounding hydrogen in the Universe during the Epoch of Re-ionization.Researchers speculate that electromagnetic signals from those times should be detectable from Earth at frequencies around the FM band and could be used to study the early Universe. Our best estimations indicate that by using a single antenna radio telescope we should be able to detect the elusive radio waves from this period. However, this will require, as a minimum, calibrating the response of the radio receiver to unprecedented levels. Using my experience designing radio sensors for the super telescope Square Kilometre Array and the Hydrogen Epoch of Re-ionization Array, I will focus my work on developing and operating a simple, very stable, easily calibratable sensor of electromagnetic waves capable of detecting these extremely faint theorized signals if operated from a remote radio quiet zone such as desert areas far away from human-made radio signals and interference. This experiment is called REACH (Radio Experiment for the Analysis of Cosmic Hydrogen), and it will aim at opening a window to these early epochs of the Universe by observing radio signals naturally emitted by hydrogen from the semi-desertic region of the Karoo in South Africa. Hydrogen was the raw material forming the very first stars but also these same hydrogen clouds filling the Universe at the time stop us from directly observing the light from these first stars. Thus, we aim to look at these stars through their interaction with the hydrogen clouds in the same way one would infer a landscape by looking at the shadows in the fog covering it.
宇宙起源和初始演化的大爆炸模型现在是一个熟悉且经过充分研究的研究领域。随后的、较晚的时期,恒星和其他天体在数十亿年的演化过程中可能会得到更好的理解。然而,人们对这些时期之间的时间(大爆炸后约 0.35 至 10 亿年)知之甚少。在此期间,宇宙从一个充满冷却中性气体的巨大体积转变为我们现在可以从地球上观察到的宇宙物体的领域。一开始,宇宙充满了炽热、浓密的电离气体雾,直到持续的膨胀和冷却使电子和质子结合并形成第一个中性原子,例如。氢。最终,中性物质在重力的作用下聚集在一起,为核聚变的发生提供了条件,导致了第一批恒星和星系的诞生(被称为宇宙黎明的时期)。随后,在再电离时代,这些物体加热并重新电离了宇宙中周围的氢。研究人员推测,那些时代的电磁信号应该可以从地球上以 FM 频段附近的频率检测到,并可用于研究早期的氢。宇宙。我们的最佳估计表明,通过使用单天线射电望远镜,我们应该能够探测到这一时期难以捉摸的无线电波。然而,这至少需要将无线电接收器的响应校准到前所未有的水平。利用我为超级望远镜平方公里阵列和氢时代再电离阵列设计无线电传感器的经验,我将集中精力开发和操作一种简单、非常稳定、易于校准的电磁波传感器,能够检测这些极其微弱的电磁波如果从远程无线电静区(例如远离人造无线电信号和干扰的沙漠地区)操作,则可以产生理论信号。这项实验被称为 REACH(宇宙氢分析无线电实验),旨在通过观察南部卡鲁半沙漠地区氢自然发射的无线电信号,为了解宇宙早期时代打开一扇窗户。非洲。氢是形成第一批恒星的原材料,但当时充满宇宙的氢云也阻止了我们直接观察这些第一批恒星发出的光。因此,我们的目标是通过这些恒星与氢云的相互作用来观察它们,就像人们通过观察覆盖在其上的雾中的阴影来推断风景一样。

项目成果

期刊论文数量(10)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Radio Antenna Design for Sky-Averaged 21cm Cosmology Experiments: The REACH Case
天平均 21 厘米宇宙学实验的无线电天线设计:REACH 案例
A Bayesian method to mitigate the effects of unmodelled time-varying systematics for 21-cm cosmology experiments
一种减轻 21 厘米宇宙学实验中未建模时变系统学影响的贝叶斯方法
Informing antenna design for sky-averaged 21-cm experiments using a simulated Bayesian data analysis pipeline
使用模拟贝叶斯数据分析管道为天空平均 21 厘米实验提供天线设计信息
A comprehensive Bayesian reanalysis of the SARAS2 data from the epoch of reionization
对再电离时代 SARAS2 数据进行全面的贝叶斯再分析
Author Correction: The REACH radiometer for detecting the 21-cm hydrogen signal from redshift z ˜ 7.5-28
作者更正:用于检测来自红移 z Ë 7.5-28 的 21 厘米氢信号的 REACH 辐射计
  • DOI:
    10.1038/s41550-022-01817-6
  • 发表时间:
    2022
  • 期刊:
  • 影响因子:
    14.1
  • 作者:
    De Lera Acedo E
  • 通讯作者:
    De Lera Acedo E
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Eloy De Lera Acedo其他文献

Eloy De Lera Acedo的其他文献

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{{ truncateString('Eloy De Lera Acedo', 18)}}的其他基金

Enabling Moon-based Radio Cosmology - CosmoCube (24-25)
实现基于月球的射电宇宙学 - CosmoCube (24-25)
  • 批准号:
    ST/Z000556/1
  • 财政年份:
    2024
  • 资助金额:
    $ 88.83万
  • 项目类别:
    Research Grant
SKA1-LOW modelling and analysis
SKA1-LOW 建模与分析
  • 批准号:
    ST/X00239X/1
  • 财政年份:
    2023
  • 资助金额:
    $ 88.83万
  • 项目类别:
    Research Grant
Probing the Cosmic Dawn and Epoch of Re-ionization with the REACH experiment
通过 REACH 实验探索宇宙黎明和再电离时代
  • 批准号:
    EP/Y02916X/1
  • 财政年份:
    2023
  • 资助金额:
    $ 88.83万
  • 项目类别:
    Research Grant
The UK Square Kilometre Array Regional Centre 2023-2025
英国平方公里阵列区域中心 2023-2025
  • 批准号:
    ST/Y000447/1
  • 财政年份:
    2023
  • 资助金额:
    $ 88.83万
  • 项目类别:
    Research Grant
SKA Construction
斯卡建筑
  • 批准号:
    ST/W00206X/1
  • 财政年份:
    2022
  • 资助金额:
    $ 88.83万
  • 项目类别:
    Research Grant

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Measuring the glow from our Cosmic Dawn
测量宇宙黎明发出的光芒
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Probing the Cosmic Dawn and Epoch of Re-ionization with the REACH experiment
通过 REACH 实验探索宇宙黎明和再电离时代
  • 批准号:
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  • 财政年份:
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