Related Experiment Video
Updated: Jul 12, 2026
07:56
Preparation of Liquid Crystal Networks for Macroscopic Oscillatory Motion Induced by Light
Published on: September 20, 2017
Cosmology in the laboratory: defect dynamics in liquid crystals.
Science (New York, N.Y.)
|March 15, 1991
Summary
Liquid crystals model cosmic defects, supporting the "one-scale" model for cosmic string evolution and revealing texture decay into monopole-antimonopole pairs. These findings aid understanding of cosmological defect dynamics.
Area of Science:
- Cosmology
- Condensed Matter Physics
Background:
- Cosmologically relevant defects, such as cosmic strings, monopoles, and texture, are crucial for understanding the early universe.
- Laboratory models are needed to study the dynamics of these complex defects.
Purpose of the Study:
- To use liquid crystals as a laboratory model for exploring the dynamics of cosmologically relevant defects.
- To investigate the evolution of cosmic strings, monopoles, and texture.
- To validate theoretical models of defect evolution and statistical mechanics.
Main Methods:
- Experiments with liquid crystals to observe defect dynamics.
- Direct study of the
- scaling solution
- for cosmic string networks.
- Numerical simulations to analyze defect behavior.
Main Results:
- Experimental support for the
- one-scale
- model of cosmic string evolution.
- Validation of qualitative predictions from string statistical mechanics.
- Observation and simulation of texture decay into monopole-antimonopole pairs, revealing monopole structure.
Conclusions:
- Liquid crystals provide a valuable and convenient system for studying cosmic defect dynamics.
- The
- one-scale
- model accurately describes cosmic string evolution.
- Texture exhibits dynamical instability, decaying into monopole-antimonopole pairs, which is observable in liquid crystal experiments.
Related Concept Videos
02:32The de Broglie Wavelength
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...
01:25Imperfections in Crystal Structure: Point, Line and Plane Defects
A perfect crystal, in theory, has a uniform structure with the same unit cell and lattice points throughout. However, any deviation from this periodic arrangement is known as an imperfection or defect. These defects can be categorized into three types: point, line, and plane defects.Point defects occur when there is a deviation from the ideal due to missing atoms, displaced atoms, or additional atoms. These imperfections might occur due to imperfect packing during crystallization or because of...
01:34Fluid Mosaic Model
The fluid mosaic model was first proposed as a visual representation of research observations. The model comprises the composition and dynamics of membranes and serves as a foundation for future membrane-related studies. The model depicts the structure of the plasma membrane with a variety of components, which include phospholipids, proteins, and carbohydrates. These integral molecules are loosely bound, defining the cell’s border and providing fluidity for optimal function.LipidsThe most...
01:26Imperfections in Crystal Structure: Stoichiometric Point Defects
Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...