相关实验视频
Updated: Jun 3, 2025

07:46
Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
8.5K
天文学和宇宙学的反物质:早期历史
1Niels Bohr Institute, Copenhagen University, Copenhagen, Denmark.
Annals of science
|January 9, 2025
概括
物理学家长期以来一直在研究反物质粒子,但它在原子等更大的形式中没有存在,这给宇宙带来了一个. 这篇论文追溯了理解这种不对称性的历史科学旅程,从早期理论到投机宇宙学.
科学领域:
- 粒子物理学 粒子物理学
- 宇宙学的宇宙学是什么?
- 天文学 天文学
背景情况:
- 反物质,包括像正子和反质子这样的反粒子,在粒子物理学中已经很成熟.
- 自然界显然缺乏反物质原子或分子,这构成了一个重要的不对称性问题.
- 物质和反物质之间的对称性表明宇宙中可能存在大规模的反物质结构.
研究的目的:
- 检查反物质概念的历史迁移,从粒子物理学到宇宙学和天文学.
- 详细介绍了20世纪70年代末发展起来的关于反物质宇宙存在的科学和投机思想.
- 为了突出观察到的物质-反物质不对称性的持续神秘.
主要方法:
- 科学文献和投机理论的历史审查.
- 对处理反物质的宇宙学模型发展的分析.
- 审查来自西方和苏联物理学家和天文学家的贡献.
主要成果:
- 追踪了反物质理论从基本粒子到宇宙结构的演变.
- 记录了各种假设,包括单独的反宇宙和等离子体宇宙学.
- 展示了科学思想的多样性,从主流到高度投机的想法.
结论:
- 宇宙的物质-反物质不对称性的根本奥秘一直持续到20世纪70年代.
- 尽管进行了广泛的调查,但没有找到对大规模反物质缺失的明确解释.
- 历史轨迹揭示了一个复杂而持续的科学探索,以解决这个宇宙学难题.
相关概念视频
Detection of Black Holes
2.2K
Although black holes were theoretically postulated in the 1920s, they remained outside the domain of observational astronomy until the 1970s.
Their closest cousins are neutron stars, which are composed almost entirely of neutrons packed against each other, making them extremely dense. A neutron star has the same mass as the Sun but its diameter is only a few kilometers. Therefore, the escape velocity from their surface is close to the speed of light.
Not until the 1960s, when the first neutron...
Their closest cousins are neutron stars, which are composed almost entirely of neutrons packed against each other, making them extremely dense. A neutron star has the same mass as the Sun but its diameter is only a few kilometers. Therefore, the escape velocity from their surface is close to the speed of light.
Not until the 1960s, when the first neutron...
2.2K
Subatomic Particles
91.6K
Dalton was only partially correct about the particles that make up matter. All matter is composed of atoms, and atoms are composed of three smaller subatomic particles: protons, neutrons, and electrons. These three particles account for the mass and the charge of an atom.
91.6K
Atomic Structure
191.2K
Overview
191.2K
The Wave Nature of Light
48.4K
The nature of light has been a subject of inquiry since antiquity. In the seventeenth century, Isaac Newton performed experiments with lenses and prisms and was able to demonstrate that white light consists of the individual colors of the rainbow combined together. Newton explained his optics findings in terms of a "corpuscular" view of light, in which light was composed of streams of extremely tiny particles traveling at high speeds according to Newton's laws of motion.
48.4K
The Atomic Theory of Matter
108.0K
The earliest recorded discussion of the basic structure of matter comes from ancient Greek philosophers. Leucippus and Democritus argued that all matter was composed of small, finite particles that they called atomos, meaning “indivisible.” Later, Aristotle and others came to the conclusion that matter consisted of various combinations of the four “elements” — fire, earth, air, and water — and could be infinitely divided. Interestingly, these philosophers...
108.0K
Thomson's e/m Experiment
3.2K
In a beam of charged particles created by a heated cathode, the particles move at different speeds. However, many applications need a beam with uniform particle speeds. An arrangement known as a velocity selector uses electric and magnetic fields to pick particles with a particular speed from the beam.
A particle with charge q, speed v, and mass m enters an area from the top, where the magnetic and electric fields are perpendicular both to the particle's motion and to one another. The...
A particle with charge q, speed v, and mass m enters an area from the top, where the magnetic and electric fields are perpendicular both to the particle's motion and to one another. The...
3.2K

