在强烈相互作用的一维混合物中的对称振荡
S Musolino1,2, M Albert2,3, A Minguzzi1
1<a href="https://ror.org/02rx3b187">Université Grenoble Alpes</a>, CNRS, LPMMC, 38000 Grenoble, France.
Physical review letters
|November 15, 2024
概括
一个维度中的量子混合物表现出对称性依赖的行为. 保持SU(2) 对称性导致稳定的动量分布,而对称性破坏导致类似于中微子风味变化的振荡.
科学领域:
- 量子物理学的量子物理学
- 多体系统是多体系统.
- 凝聚物质理论 凝聚物质理论
背景情况:
- 一个维度的多元件量子混合物是复杂的系统.
- 描述这些混合物需要理解它们在粒子交换中的对称性.
- 强烈相互作用的斯-斯混合物为理论分析带来了独特的挑战.
研究的目的:
- 在强烈相互作用的斯-斯混合物中研究动量分布的时间演变.
- 分析SU(2) 对称性保护与对称性破坏在这个进化中的作用.
- 为了建立动量分布振荡和对称性特性之间的联系.
主要方法:
- 在一个维度中研究了强烈相互作用的斯-斯混合物.
- 从最初的对称混合状态分析了动量分布的时间演变.
- 在强相互作用中利用动量分布运算符和类和运算符 (对称证人) 之间的换算属性.
主要成果:
- 对于一个SU(2) 保持哈密尔顿式的对称性,动量分布在时间上保持近乎恒定.
- 在对称性破坏的情况下 (不同的物种间和物种内部相互作用),动量分布表现出很大的振荡.
- 动量分布中的这些振荡直接对应于对称性中的振荡,反映了中微子风味振荡.
结论:
- 量子混合物的对称性,哈密尔顿式,决定了它的动量分布的稳定性.
- 在强烈相互作用的斯-斯混合物中,对称性破裂导致动量分布的可观测振荡.
- 这种现象为观察对称性动态提供了一个新的机制,类似于中微子振荡.
相关概念视频
01:04Oscillations about an Equilibrium Position
5.3K
Stability is an important concept in oscillation. If an equilibrium point is stable, a slight disturbance of an object that is initially at the stable equilibrium point will cause the object to oscillate around that point. For an unstable equilibrium point, if the object is disturbed slightly, it will not return to the equilibrium point. There are three conditions for equilibrium points—stable, unstable, and half-stable. A half-stable equilibrium point is also unstable, but is named so...
5.3K
01:28Symmetry in Maxwell's Equations
3.3K
Once the fields have been calculated using Maxwell's four equations, the Lorentz force equation gives the force that the fields exert on a charged particle moving with a certain velocity. The Lorentz force equation combines the force of the electric field and of the magnetic field on the moving charge. Maxwell's equations and the Lorentz force law together encompass all the laws of electricity and magnetism. The symmetry that Maxwell introduced into his mathematical framework may not be...
3.3K
01:02¹H NMR: Interpreting Distorted and Overlapping Signals
1.0K
Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
1.0K
01:18First Law: Particles in Two-dimensional Equilibrium
5.0K
Recall that a particle in equilibrium is one for which the external forces are balanced. Static equilibrium involves objects at rest, and dynamic equilibrium involves objects in motion without acceleration; but it is important to remember that these conditions are relative. For instance, an object may be at rest when viewed from one frame of reference, but that same object would appear to be in motion when viewed by someone moving at a constant velocity.
Newton's first law tells us about...
Newton's first law tells us about...
5.0K
01:06Forced Oscillations
6.5K
When an oscillator is forced with a periodic driving force, the motion may seem chaotic. The motions of such oscillators are known as transients. After the transients die out, the oscillator reaches a steady state, where the motion is periodic, and the displacement is determined.
6.5K
01:10First Law: Particles in One-dimensional Equilibrium
6.8K
Newton's first law of motion states that a body at rest remains at rest, or if in motion, remains in motion at constant velocity, unless acted on by a net external force. It also states that there must be a cause for any change in velocity (a change in either magnitude or direction) to occur. This cause is a net external force. For example, consider what happens to an object sliding along a rough horizontal surface. The object quickly grinds to a halt, due to the net force of friction. If...
6.8K