洛伦兹混乱中的不对称极限循环诱导了记忆驱动的活性粒子的异常移动性
Rahil N Valani1, Bruno S Dandogbessi2
1Rudolf Peierls Centre for Theoretical Physics, Parks Road, <a href="https://ror.org/052gg0110">University of Oxford</a>, OX1 3PU, United Kingdom.
Physical review. E
|December 18, 2024
概括
这项研究揭示了由行走的水滴所启发的活性粒子如何表现出矛盾的巨型负移动性 (GNM) 和巨型正移动性 (GPM),这是由于它们的记忆和混乱的洛伦兹系统模型.
科学领域:
- 物理 物理学 物理
- 非线性动力学是一种非线性动力学.
- 活动物质物理学 活动物质物理学
背景情况:
- 不平衡系统可以对外部力量表现出不寻常的反应,包括巨大的负移动性 (GNM) 和巨大的正移动性 (GPM).
- 之前的研究集中在被动惯性粒子的理想化模型上,限制了对活性粒子动态学的理解.
研究的目的:
- 在内存驱动的活性粒子模型中调查异常的运输行为.
- 探索GNM和GPM在最小活性粒子系统中的同时出现.
主要方法:
- 开发了一个内存驱动活性粒子的最小模型,将其运动映射到洛伦茨系统.
- 在活性粒子的洛伦兹模型中引入了小偏移力,以分析运输特性.
主要成果:
- 在参数空间内发现了GNM和GPM同时出现的动态机制.
- 观察到共存的不对称极限周期在偏差力下迁移,导致异常运输.
- 证明了运输行为对活性粒子的记忆敏感.
结论:
- 该研究突出了由低维非线性系统建模的活性粒子中异常运输的一般机制.
- 这项工作提供了对活性物质复杂动态的洞察,并与像行走的水滴这样的实验系统进行了平行.
相关概念视频
First 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
First 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
Cyclic Processes And Isolated Systems
2.7K
A thermodynamic system with zero heat exchange and work is an isolated system. For these systems, the internal energy remains constant.
In the case of a non-isolated system, the change in the internal energy is zero only if the process is cyclic. A thermodynamic process is considered cyclic if the system undergoes a series of changes and returns to its initial state.
Consider a cyclic process that returns to its initial state, undergoing a four-step process. The heat transfer along each...
In the case of a non-isolated system, the change in the internal energy is zero only if the process is cyclic. A thermodynamic process is considered cyclic if the system undergoes a series of changes and returns to its initial state.
Consider a cyclic process that returns to its initial state, undergoing a four-step process. The heat transfer along each...
2.7K
Equilibrium Conditions for a Particle
1.0K
When an object is in equilibrium, it is either at rest or moving with a constant velocity. There are two types of equilibrium: static and dynamic. Static equilibrium occurs when an object is at rest, while dynamic equilibrium occurs when an object is moving with a constant velocity. In both cases, there must be a balance of forces acting on the object.
To understand the concept of equilibrium, let us first consider the forces acting on an object. When different forces act on an object, they can...
To understand the concept of equilibrium, let us first consider the forces acting on an object. When different forces act on an object, they can...
1.0K
Actin Polymerization and Cell Motility
5.1K
Actin is a family of globular proteins that are highly abundant in eukaryotic cells. It makes up approximately 1-5% of total cell protein concentration. Actin monomers polymerize to form a complex network of polarized filaments, the actin cytoskeleton, that plays a crucial role in many cellular processes, including cell motility, division, endocytosis, and metastasis of cancer cells.
Actin cytoskeleton dynamics can produce pushing, pulling, and resistance forces that help the cell to migrate....
Actin cytoskeleton dynamics can produce pushing, pulling, and resistance forces that help the cell to migrate....
5.1K
Symmetry 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


