从微观尺度上快速结构形成的引力波在物质辐射等同之前的微观尺度上
Marcos M Flores1, Alexander Kusenko1,2,3, Misao Sasaki2,4,5
1Department of Physics and Astronomy, University of California, Los Angeles Los Angeles, California, 90095-1547, USA.
Physical review letters
|July 21, 2023
概括
比重力更强的尺度场可以驱动早期宇宙中的结构形成. 科学家们从这些过程中确定了一个独特的引力波特征,可以通过未来的实验来检测.
科学领域:
- 宇宙学和天体物理学.
- 基本的物理基础.
背景情况:
- 梯度场是假设的实体,可以调解力量.
- 这些力量在早期宇宙中可能是显著的,影响结构形成.
- 引力不稳定是已知的结构增长机制.
研究的目的:
- 调查标量场驱动结构形成的潜力.
- 为了确定标量场活动的独特观测特征.
- 为了评估未来引力波实验中这种特征的可检测性.
主要方法:
- 斯卡拉场相互作用及其宇宙学效应的理论建模.
- 分析由标量场驱动的不稳定性产生的潜在引力波信号.
- 预测信号与未来引力波探测器的灵敏度进行比较.
主要成果:
- 在小尺度上,尺度场可以调解比重力更强的吸引力.
- 这些力量可以导致不稳定,促进宇宙结构的增长.
- 已经确定了与这些过程相关的独特的引力波特征.
结论:
- 尺度场为早期宇宙结构形成提供了一个新的机制.
- 预测的引力波特征是未来宇宙观测的有希望的目标.
- 检测到这个签名将提供证据证明存在和影响的标量场.
相关概念视频
01:21Schwarzschild Radius and Event Horizon
2.1K
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...
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...
2.1K
01:17Space-Time Curvature and the General Theory of Relativity
2.8K
In 1905, Albert Einstein published his special theory of relativity. According to this theory, no matter in the universe can attain a speed greater than the speed of light in a vacuum, which thus serves as the speed limit of the universe.
This has been verified in many experiments. However, space and time are no longer absolute. Two observers moving relative to one another do not agree on the length of objects or the passage of time. The mechanics of objects based on Newton's laws of...
This has been verified in many experiments. However, space and time are no longer absolute. Two observers moving relative to one another do not agree on the length of objects or the passage of time. The mechanics of objects based on Newton's laws of...
2.8K
02:12The Wave Nature of Light
49.3K
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.
49.3K
02:32The de Broglie Wavelength
26.0K
In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
26.0K
01:17The Principle of Superposition and the Gravitational Field
1.4K
The principle of superposition applies to gravitational forces of objects that are sufficiently far apart. It states that the net gravitational force on a point object is the vector sum of the gravitational forces on it due to various objects. The principle helps calculate the force by listing the individual forces and then vectorially summing them up. However, it should be noted that the principle of superposition is not always apparent. In the presence of a second force, the first force could...
1.4K
01:30Electromagnetic Waves in Matter
3.0K
Electromagnetic waves can travel in the vacuum as well as in matter. For example light, which is an electromagnetic wave, can travel through air, water, or glass.
Consider the electromagnetic wave passing through a dielectric medium. In such a case, Maxwell's equations get modified. In Ampere's law, ε0 , the dielectric permittivity of free space is replaced with ε, the permittivity of dielectric. Also, the vacuum permeability μ0 is replaced by the permeability of the...
Consider the electromagnetic wave passing through a dielectric medium. In such a case, Maxwell's equations get modified. In Ampere's law, ε0 , the dielectric permittivity of free space is replaced with ε, the permittivity of dielectric. Also, the vacuum permeability μ0 is replaced by the permeability of the...
3.0K