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Detection of Black Holes01:10

Detection of Black Holes

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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...
2.5K
Atomic Nuclei: Larmor Precession Frequency01:11

Atomic Nuclei: Larmor Precession Frequency

2.8K
The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession,...
2.8K
Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

2.3K
Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
2.3K
Gravitation Between Spherically Symmetric Masses01:14

Gravitation Between Spherically Symmetric Masses

1.3K
The gravitational potential energy between two spherically symmetric bodies can be calculated from the masses and the distance between the bodies, assuming that the center of mass is concentrated at the respective centers of the bodies.
1.3K
Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

1.2K
The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
1.2K
Schwarzschild Radius and Event Horizon01:21

Schwarzschild Radius and Event Horizon

2.6K
No object with a finite mass can travel faster than the speed of light in a vacuum. This fact has an interesting consequence in the domain of extremely high gravitational fields.
The minimum speed required to launch a projectile from the surface of an object to which it is gravitationally bound so that it eventually escapes the object’s gravitational field is called the escape velocity. The escape velocity is independent of the mass of the object. Merging the idea of escape...
2.6K

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相关实验视频

Updated: Jan 17, 2026

Setting Limits on Supersymmetry Using Simplified Models
07:46

Setting Limits on Supersymmetry Using Simplified Models

Published on: November 15, 2013

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超光暗物质统计数据用于脉冲星计时检测

Kimberly K Boddy1, Jeff A Dror2, Austin Lam2

  • 1The University of Texas at Austin, Texas Center for Cosmology and Astroparticle Physics, Weinberg Institute, Department of Physics, Austin, Texas 78712, USA.

Physical review letters
|September 22, 2025
PubMed
概括
此摘要是机器生成的。

科学家们开发了一种新的统计方法,使用脉冲星计时检测超轻暗物质. 这种方法解释了暗物质的存在.

更多相关视频

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

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相关实验视频

Last Updated: Jan 17, 2026

Setting Limits on Supersymmetry Using Simplified Models
07:46

Setting Limits on Supersymmetry Using Simplified Models

Published on: November 15, 2013

8.9K
Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
09:23

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
07:56

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

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科学领域:

  • 天体物理学 天体物理学
  • 宇宙学的宇宙学是什么?
  • 粒子物理学 粒子物理学

背景情况:

  • 超轻暗物质 (ULDM) 可以导致通过脉冲星计时检测到的度量扰动.
  • 当前的搜索可能无法完全捕捉ULDM字段的统计属性.

研究的目的:

  • 开发一套统一的统计方法,用于引力直接检测ULDM.
  • 为了提高ULDM检测的准确性,使用脉冲星计时阵列.

主要方法:

  • 由ULDM引起的度数波动的两点函数的导数.
  • 将ULDM字段的连贯长度纳入分析中.
  • 将该方法应用于脉冲星计时数据.

主要成果:

  • 介绍了用于ULDM检测的新型统计框架.
  • 衍生的两点函数准确地模拟了度数扰动.
  • 强调了在ULDM搜索中连贯长度的重要性.

结论:

  • 新的统计方法为检测ULDM提供了更一致的方法.
  • 这种方法增强了重力直接检测ULDM的潜力.
  • 未来的脉冲星定时搜索可以实现这种框架,以提高灵敏度.